From: Nathan Sidwell <nathan@acm.org>
Date: Wed, 17 Feb 2021 18:43:21 +0000 (-0800)
Subject: c++: Macros need to be GTY-reachable [PR 99023]
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d8889c99aab4b599aa7ceb7079e69a9766171336;p=gcc.git

c++: Macros need to be GTY-reachable [PR 99023]

I'd missed that macros were allocated from GC storage, and that they can
become unattached from an identifier, and therefore not GC-reachable.
And then bad things happen.   Fixed by making the module machinery's
reference vector a GC root.

	PR c++/99023
	gcc/cp/
	* module.cc (struct macro_export): Add GTY markers.
	(macro_exports): Likewise, us a va_gc Vector.
	gcc/testsuite/
	* g++.dg/modules/pr99023_a.H: New.
	* g++.dg/modules/pr99023_b.H: New.
---

diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 520494f2543..064e57a29c4 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -16566,7 +16566,7 @@ module_state::read_define (bytes_in &sec, cpp_reader *reader, bool located) cons
 }
 
 /* Exported macro data.  */
-struct macro_export {
+struct GTY(()) macro_export {
   cpp_macro *def;
   location_t undef_loc;
 
@@ -16731,7 +16731,7 @@ static vec<macro_import, va_heap, vl_embed> *macro_imports;
    indexes this array.  If the zeroth slot is not for module zero,
    there is no export.  */
 
-static vec<macro_export, va_heap, vl_embed> *macro_exports;
+static GTY(()) vec<macro_export, va_gc> *macro_exports;
 
 /* The reachable set of header imports from this TU.  */
 
diff --git a/gcc/testsuite/g++.dg/modules/pr99023_a.H b/gcc/testsuite/g++.dg/modules/pr99023_a.H
new file mode 100644
index 00000000000..0db3f559ff0
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr99023_a.H
@@ -0,0 +1,4237 @@
+# 0 "./pr99023_a.H"
+// PR c++/99023, ICE
+// { dg-additional-options {-std=c++17 -Wno-pedantic -fmodule-header -fpreprocessed -fdirectives-only --param ggc-min-expand=0} }
+// { dg-module-cmi {,/pr99023_a.H} }
+# 0 "<built-in>"
+#define __STDC__ 1
+# 0 "<built-in>"
+#define __cplusplus 201703L
+# 0 "<built-in>"
+#define __STDC_UTF_16__ 1
+# 0 "<built-in>"
+#define __STDC_UTF_32__ 1
+# 0 "<built-in>"
+#define __STDC_HOSTED__ 1
+# 0 "<built-in>"
+#define __GNUC__ 11
+# 0 "<built-in>"
+#define __GNUC_MINOR__ 0
+# 0 "<built-in>"
+#define __GNUC_PATCHLEVEL__ 0
+# 0 "<built-in>"
+#define __VERSION__ "11.0.0 20210217 (experimental)"
+# 0 "<built-in>"
+#define __ATOMIC_RELAXED 0
+# 0 "<built-in>"
+#define __ATOMIC_SEQ_CST 5
+# 0 "<built-in>"
+#define __ATOMIC_ACQUIRE 2
+# 0 "<built-in>"
+#define __ATOMIC_RELEASE 3
+# 0 "<built-in>"
+#define __ATOMIC_ACQ_REL 4
+# 0 "<built-in>"
+#define __ATOMIC_CONSUME 1
+# 0 "<built-in>"
+#define __FINITE_MATH_ONLY__ 0
+# 0 "<built-in>"
+#define _LP64 1
+# 0 "<built-in>"
+#define __LP64__ 1
+# 0 "<built-in>"
+#define __SIZEOF_INT__ 4
+# 0 "<built-in>"
+#define __SIZEOF_LONG__ 8
+# 0 "<built-in>"
+#define __SIZEOF_LONG_LONG__ 8
+# 0 "<built-in>"
+#define __SIZEOF_SHORT__ 2
+# 0 "<built-in>"
+#define __SIZEOF_FLOAT__ 4
+# 0 "<built-in>"
+#define __SIZEOF_DOUBLE__ 8
+# 0 "<built-in>"
+#define __SIZEOF_LONG_DOUBLE__ 16
+# 0 "<built-in>"
+#define __SIZEOF_SIZE_T__ 8
+# 0 "<built-in>"
+#define __CHAR_BIT__ 8
+# 0 "<built-in>"
+#define __BIGGEST_ALIGNMENT__ 16
+# 0 "<built-in>"
+#define __ORDER_LITTLE_ENDIAN__ 1234
+# 0 "<built-in>"
+#define __ORDER_BIG_ENDIAN__ 4321
+# 0 "<built-in>"
+#define __ORDER_PDP_ENDIAN__ 3412
+# 0 "<built-in>"
+#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+# 0 "<built-in>"
+#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
+# 0 "<built-in>"
+#define __SIZEOF_POINTER__ 8
+# 0 "<built-in>"
+#define __GNUC_EXECUTION_CHARSET_NAME "UTF-8"
+# 0 "<built-in>"
+#define __GNUC_WIDE_EXECUTION_CHARSET_NAME "UTF-32LE"
+# 0 "<built-in>"
+#define __GNUG__ 11
+# 0 "<built-in>"
+#define __SIZE_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __PTRDIFF_TYPE__ long int
+# 0 "<built-in>"
+#define __WCHAR_TYPE__ int
+# 0 "<built-in>"
+#define __WINT_TYPE__ unsigned int
+# 0 "<built-in>"
+#define __INTMAX_TYPE__ long int
+# 0 "<built-in>"
+#define __UINTMAX_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __CHAR16_TYPE__ short unsigned int
+# 0 "<built-in>"
+#define __CHAR32_TYPE__ unsigned int
+# 0 "<built-in>"
+#define __SIG_ATOMIC_TYPE__ int
+# 0 "<built-in>"
+#define __INT8_TYPE__ signed char
+# 0 "<built-in>"
+#define __INT16_TYPE__ short int
+# 0 "<built-in>"
+#define __INT32_TYPE__ int
+# 0 "<built-in>"
+#define __INT64_TYPE__ long int
+# 0 "<built-in>"
+#define __UINT8_TYPE__ unsigned char
+# 0 "<built-in>"
+#define __UINT16_TYPE__ short unsigned int
+# 0 "<built-in>"
+#define __UINT32_TYPE__ unsigned int
+# 0 "<built-in>"
+#define __UINT64_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __INT_LEAST8_TYPE__ signed char
+# 0 "<built-in>"
+#define __INT_LEAST16_TYPE__ short int
+# 0 "<built-in>"
+#define __INT_LEAST32_TYPE__ int
+# 0 "<built-in>"
+#define __INT_LEAST64_TYPE__ long int
+# 0 "<built-in>"
+#define __UINT_LEAST8_TYPE__ unsigned char
+# 0 "<built-in>"
+#define __UINT_LEAST16_TYPE__ short unsigned int
+# 0 "<built-in>"
+#define __UINT_LEAST32_TYPE__ unsigned int
+# 0 "<built-in>"
+#define __UINT_LEAST64_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __INT_FAST8_TYPE__ signed char
+# 0 "<built-in>"
+#define __INT_FAST16_TYPE__ long int
+# 0 "<built-in>"
+#define __INT_FAST32_TYPE__ long int
+# 0 "<built-in>"
+#define __INT_FAST64_TYPE__ long int
+# 0 "<built-in>"
+#define __UINT_FAST8_TYPE__ unsigned char
+# 0 "<built-in>"
+#define __UINT_FAST16_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __UINT_FAST32_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __UINT_FAST64_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __INTPTR_TYPE__ long int
+# 0 "<built-in>"
+#define __UINTPTR_TYPE__ long unsigned int
+# 0 "<built-in>"
+#define __GXX_WEAK__ 1
+# 0 "<built-in>"
+#define __DEPRECATED 1
+# 0 "<built-in>"
+#define __GXX_RTTI 1
+# 0 "<built-in>"
+#define __cpp_rtti 199711L
+# 0 "<built-in>"
+#define __GXX_EXPERIMENTAL_CXX0X__ 1
+# 0 "<built-in>"
+#define __cpp_binary_literals 201304L
+# 0 "<built-in>"
+#define __cpp_hex_float 201603L
+# 0 "<built-in>"
+#define __cpp_runtime_arrays 198712L
+# 0 "<built-in>"
+#define __cpp_raw_strings 200710L
+# 0 "<built-in>"
+#define __cpp_unicode_literals 200710L
+# 0 "<built-in>"
+#define __cpp_user_defined_literals 200809L
+# 0 "<built-in>"
+#define __cpp_lambdas 200907L
+# 0 "<built-in>"
+#define __cpp_decltype 200707L
+# 0 "<built-in>"
+#define __cpp_attributes 200809L
+# 0 "<built-in>"
+#define __cpp_rvalue_reference 200610L
+# 0 "<built-in>"
+#define __cpp_rvalue_references 200610L
+# 0 "<built-in>"
+#define __cpp_variadic_templates 200704L
+# 0 "<built-in>"
+#define __cpp_initializer_lists 200806L
+# 0 "<built-in>"
+#define __cpp_delegating_constructors 200604L
+# 0 "<built-in>"
+#define __cpp_nsdmi 200809L
+# 0 "<built-in>"
+#define __cpp_inheriting_constructors 201511L
+# 0 "<built-in>"
+#define __cpp_ref_qualifiers 200710L
+# 0 "<built-in>"
+#define __cpp_alias_templates 200704L
+# 0 "<built-in>"
+#define __cpp_return_type_deduction 201304L
+# 0 "<built-in>"
+#define __cpp_init_captures 201304L
+# 0 "<built-in>"
+#define __cpp_generic_lambdas 201304L
+# 0 "<built-in>"
+#define __cpp_decltype_auto 201304L
+# 0 "<built-in>"
+#define __cpp_aggregate_nsdmi 201304L
+# 0 "<built-in>"
+#define __cpp_variable_templates 201304L
+# 0 "<built-in>"
+#define __cpp_digit_separators 201309L
+# 0 "<built-in>"
+#define __cpp_unicode_characters 201411L
+# 0 "<built-in>"
+#define __cpp_static_assert 201411L
+# 0 "<built-in>"
+#define __cpp_namespace_attributes 201411L
+# 0 "<built-in>"
+#define __cpp_enumerator_attributes 201411L
+# 0 "<built-in>"
+#define __cpp_nested_namespace_definitions 201411L
+# 0 "<built-in>"
+#define __cpp_fold_expressions 201603L
+# 0 "<built-in>"
+#define __cpp_nontype_template_args 201411L
+# 0 "<built-in>"
+#define __cpp_range_based_for 201603L
+# 0 "<built-in>"
+#define __cpp_constexpr 201603L
+# 0 "<built-in>"
+#define __cpp_if_constexpr 201606L
+# 0 "<built-in>"
+#define __cpp_capture_star_this 201603L
+# 0 "<built-in>"
+#define __cpp_inline_variables 201606L
+# 0 "<built-in>"
+#define __cpp_aggregate_bases 201603L
+# 0 "<built-in>"
+#define __cpp_deduction_guides 201703L
+# 0 "<built-in>"
+#define __cpp_noexcept_function_type 201510L
+# 0 "<built-in>"
+#define __cpp_template_auto 201606L
+# 0 "<built-in>"
+#define __cpp_structured_bindings 201606L
+# 0 "<built-in>"
+#define __cpp_variadic_using 201611L
+# 0 "<built-in>"
+#define __cpp_guaranteed_copy_elision 201606L
+# 0 "<built-in>"
+#define __cpp_nontype_template_parameter_auto 201606L
+# 0 "<built-in>"
+#define __cpp_modules 201810L
+# 0 "<built-in>"
+#define __cpp_sized_deallocation 201309L
+# 0 "<built-in>"
+#define __cpp_aligned_new 201606L
+# 0 "<built-in>"
+#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16
+# 0 "<built-in>"
+#define __cpp_template_template_args 201611L
+# 0 "<built-in>"
+#define __cpp_threadsafe_static_init 200806L
+# 0 "<built-in>"
+#define __STDCPP_THREADS__ 1
+# 0 "<built-in>"
+#define __EXCEPTIONS 1
+# 0 "<built-in>"
+#define __cpp_exceptions 199711L
+# 0 "<built-in>"
+#define __GXX_ABI_VERSION 1015
+# 0 "<built-in>"
+#define __SCHAR_MAX__ 0x7f
+# 0 "<built-in>"
+#define __SHRT_MAX__ 0x7fff
+# 0 "<built-in>"
+#define __INT_MAX__ 0x7fffffff
+# 0 "<built-in>"
+#define __LONG_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __LONG_LONG_MAX__ 0x7fffffffffffffffLL
+# 0 "<built-in>"
+#define __WCHAR_MAX__ 0x7fffffff
+# 0 "<built-in>"
+#define __WCHAR_MIN__ (-__WCHAR_MAX__ - 1)
+# 0 "<built-in>"
+#define __WINT_MAX__ 0xffffffffU
+# 0 "<built-in>"
+#define __WINT_MIN__ 0U
+# 0 "<built-in>"
+#define __PTRDIFF_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __SIZE_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __SCHAR_WIDTH__ 8
+# 0 "<built-in>"
+#define __SHRT_WIDTH__ 16
+# 0 "<built-in>"
+#define __INT_WIDTH__ 32
+# 0 "<built-in>"
+#define __LONG_WIDTH__ 64
+# 0 "<built-in>"
+#define __LONG_LONG_WIDTH__ 64
+# 0 "<built-in>"
+#define __WCHAR_WIDTH__ 32
+# 0 "<built-in>"
+#define __WINT_WIDTH__ 32
+# 0 "<built-in>"
+#define __PTRDIFF_WIDTH__ 64
+# 0 "<built-in>"
+#define __SIZE_WIDTH__ 64
+# 0 "<built-in>"
+#define __INTMAX_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INTMAX_C(c) c ## L
+# 0 "<built-in>"
+#define __UINTMAX_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __UINTMAX_C(c) c ## UL
+# 0 "<built-in>"
+#define __INTMAX_WIDTH__ 64
+# 0 "<built-in>"
+#define __SIG_ATOMIC_MAX__ 0x7fffffff
+# 0 "<built-in>"
+#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1)
+# 0 "<built-in>"
+#define __SIG_ATOMIC_WIDTH__ 32
+# 0 "<built-in>"
+#define __INT8_MAX__ 0x7f
+# 0 "<built-in>"
+#define __INT16_MAX__ 0x7fff
+# 0 "<built-in>"
+#define __INT32_MAX__ 0x7fffffff
+# 0 "<built-in>"
+#define __INT64_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __UINT8_MAX__ 0xff
+# 0 "<built-in>"
+#define __UINT16_MAX__ 0xffff
+# 0 "<built-in>"
+#define __UINT32_MAX__ 0xffffffffU
+# 0 "<built-in>"
+#define __UINT64_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __INT_LEAST8_MAX__ 0x7f
+# 0 "<built-in>"
+#define __INT8_C(c) c
+# 0 "<built-in>"
+#define __INT_LEAST8_WIDTH__ 8
+# 0 "<built-in>"
+#define __INT_LEAST16_MAX__ 0x7fff
+# 0 "<built-in>"
+#define __INT16_C(c) c
+# 0 "<built-in>"
+#define __INT_LEAST16_WIDTH__ 16
+# 0 "<built-in>"
+#define __INT_LEAST32_MAX__ 0x7fffffff
+# 0 "<built-in>"
+#define __INT32_C(c) c
+# 0 "<built-in>"
+#define __INT_LEAST32_WIDTH__ 32
+# 0 "<built-in>"
+#define __INT_LEAST64_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INT64_C(c) c ## L
+# 0 "<built-in>"
+#define __INT_LEAST64_WIDTH__ 64
+# 0 "<built-in>"
+#define __UINT_LEAST8_MAX__ 0xff
+# 0 "<built-in>"
+#define __UINT8_C(c) c
+# 0 "<built-in>"
+#define __UINT_LEAST16_MAX__ 0xffff
+# 0 "<built-in>"
+#define __UINT16_C(c) c
+# 0 "<built-in>"
+#define __UINT_LEAST32_MAX__ 0xffffffffU
+# 0 "<built-in>"
+#define __UINT32_C(c) c ## U
+# 0 "<built-in>"
+#define __UINT_LEAST64_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __UINT64_C(c) c ## UL
+# 0 "<built-in>"
+#define __INT_FAST8_MAX__ 0x7f
+# 0 "<built-in>"
+#define __INT_FAST8_WIDTH__ 8
+# 0 "<built-in>"
+#define __INT_FAST16_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INT_FAST16_WIDTH__ 64
+# 0 "<built-in>"
+#define __INT_FAST32_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INT_FAST32_WIDTH__ 64
+# 0 "<built-in>"
+#define __INT_FAST64_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INT_FAST64_WIDTH__ 64
+# 0 "<built-in>"
+#define __UINT_FAST8_MAX__ 0xff
+# 0 "<built-in>"
+#define __UINT_FAST16_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __UINT_FAST32_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __UINT_FAST64_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __INTPTR_MAX__ 0x7fffffffffffffffL
+# 0 "<built-in>"
+#define __INTPTR_WIDTH__ 64
+# 0 "<built-in>"
+#define __UINTPTR_MAX__ 0xffffffffffffffffUL
+# 0 "<built-in>"
+#define __GCC_IEC_559 2
+# 0 "<built-in>"
+#define __GCC_IEC_559_COMPLEX 2
+# 0 "<built-in>"
+#define __FLT_EVAL_METHOD__ 0
+# 0 "<built-in>"
+#define __FLT_EVAL_METHOD_TS_18661_3__ 0
+# 0 "<built-in>"
+#define __DEC_EVAL_METHOD__ 2
+# 0 "<built-in>"
+#define __FLT_RADIX__ 2
+# 0 "<built-in>"
+#define __FLT_MANT_DIG__ 24
+# 0 "<built-in>"
+#define __FLT_DIG__ 6
+# 0 "<built-in>"
+#define __FLT_MIN_EXP__ (-125)
+# 0 "<built-in>"
+#define __FLT_MIN_10_EXP__ (-37)
+# 0 "<built-in>"
+#define __FLT_MAX_EXP__ 128
+# 0 "<built-in>"
+#define __FLT_MAX_10_EXP__ 38
+# 0 "<built-in>"
+#define __FLT_DECIMAL_DIG__ 9
+# 0 "<built-in>"
+#define __FLT_MAX__ 3.40282346638528859811704183484516925e+38F
+# 0 "<built-in>"
+#define __FLT_NORM_MAX__ 3.40282346638528859811704183484516925e+38F
+# 0 "<built-in>"
+#define __FLT_MIN__ 1.17549435082228750796873653722224568e-38F
+# 0 "<built-in>"
+#define __FLT_EPSILON__ 1.19209289550781250000000000000000000e-7F
+# 0 "<built-in>"
+#define __FLT_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F
+# 0 "<built-in>"
+#define __FLT_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __DBL_MANT_DIG__ 53
+# 0 "<built-in>"
+#define __DBL_DIG__ 15
+# 0 "<built-in>"
+#define __DBL_MIN_EXP__ (-1021)
+# 0 "<built-in>"
+#define __DBL_MIN_10_EXP__ (-307)
+# 0 "<built-in>"
+#define __DBL_MAX_EXP__ 1024
+# 0 "<built-in>"
+#define __DBL_MAX_10_EXP__ 308
+# 0 "<built-in>"
+#define __DBL_DECIMAL_DIG__ 17
+# 0 "<built-in>"
+#define __DBL_MAX__ double(1.79769313486231570814527423731704357e+308L)
+# 0 "<built-in>"
+#define __DBL_NORM_MAX__ double(1.79769313486231570814527423731704357e+308L)
+# 0 "<built-in>"
+#define __DBL_MIN__ double(2.22507385850720138309023271733240406e-308L)
+# 0 "<built-in>"
+#define __DBL_EPSILON__ double(2.22044604925031308084726333618164062e-16L)
+# 0 "<built-in>"
+#define __DBL_DENORM_MIN__ double(4.94065645841246544176568792868221372e-324L)
+# 0 "<built-in>"
+#define __DBL_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __DBL_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __DBL_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __DBL_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __LDBL_MANT_DIG__ 64
+# 0 "<built-in>"
+#define __LDBL_DIG__ 18
+# 0 "<built-in>"
+#define __LDBL_MIN_EXP__ (-16381)
+# 0 "<built-in>"
+#define __LDBL_MIN_10_EXP__ (-4931)
+# 0 "<built-in>"
+#define __LDBL_MAX_EXP__ 16384
+# 0 "<built-in>"
+#define __LDBL_MAX_10_EXP__ 4932
+# 0 "<built-in>"
+#define __DECIMAL_DIG__ 21
+# 0 "<built-in>"
+#define __LDBL_DECIMAL_DIG__ 21
+# 0 "<built-in>"
+#define __LDBL_MAX__ 1.18973149535723176502126385303097021e+4932L
+# 0 "<built-in>"
+#define __LDBL_NORM_MAX__ 1.18973149535723176502126385303097021e+4932L
+# 0 "<built-in>"
+#define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
+# 0 "<built-in>"
+#define __LDBL_EPSILON__ 1.08420217248550443400745280086994171e-19L
+# 0 "<built-in>"
+#define __LDBL_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951L
+# 0 "<built-in>"
+#define __LDBL_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __LDBL_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __LDBL_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __LDBL_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __FLT32_MANT_DIG__ 24
+# 0 "<built-in>"
+#define __FLT32_DIG__ 6
+# 0 "<built-in>"
+#define __FLT32_MIN_EXP__ (-125)
+# 0 "<built-in>"
+#define __FLT32_MIN_10_EXP__ (-37)
+# 0 "<built-in>"
+#define __FLT32_MAX_EXP__ 128
+# 0 "<built-in>"
+#define __FLT32_MAX_10_EXP__ 38
+# 0 "<built-in>"
+#define __FLT32_DECIMAL_DIG__ 9
+# 0 "<built-in>"
+#define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
+# 0 "<built-in>"
+#define __FLT32_NORM_MAX__ 3.40282346638528859811704183484516925e+38F32
+# 0 "<built-in>"
+#define __FLT32_MIN__ 1.17549435082228750796873653722224568e-38F32
+# 0 "<built-in>"
+#define __FLT32_EPSILON__ 1.19209289550781250000000000000000000e-7F32
+# 0 "<built-in>"
+#define __FLT32_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F32
+# 0 "<built-in>"
+#define __FLT32_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT32_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT32_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT32_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __FLT64_MANT_DIG__ 53
+# 0 "<built-in>"
+#define __FLT64_DIG__ 15
+# 0 "<built-in>"
+#define __FLT64_MIN_EXP__ (-1021)
+# 0 "<built-in>"
+#define __FLT64_MIN_10_EXP__ (-307)
+# 0 "<built-in>"
+#define __FLT64_MAX_EXP__ 1024
+# 0 "<built-in>"
+#define __FLT64_MAX_10_EXP__ 308
+# 0 "<built-in>"
+#define __FLT64_DECIMAL_DIG__ 17
+# 0 "<built-in>"
+#define __FLT64_MAX__ 1.79769313486231570814527423731704357e+308F64
+# 0 "<built-in>"
+#define __FLT64_NORM_MAX__ 1.79769313486231570814527423731704357e+308F64
+# 0 "<built-in>"
+#define __FLT64_MIN__ 2.22507385850720138309023271733240406e-308F64
+# 0 "<built-in>"
+#define __FLT64_EPSILON__ 2.22044604925031308084726333618164062e-16F64
+# 0 "<built-in>"
+#define __FLT64_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F64
+# 0 "<built-in>"
+#define __FLT64_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT64_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT64_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT64_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __FLT128_MANT_DIG__ 113
+# 0 "<built-in>"
+#define __FLT128_DIG__ 33
+# 0 "<built-in>"
+#define __FLT128_MIN_EXP__ (-16381)
+# 0 "<built-in>"
+#define __FLT128_MIN_10_EXP__ (-4931)
+# 0 "<built-in>"
+#define __FLT128_MAX_EXP__ 16384
+# 0 "<built-in>"
+#define __FLT128_MAX_10_EXP__ 4932
+# 0 "<built-in>"
+#define __FLT128_DECIMAL_DIG__ 36
+# 0 "<built-in>"
+#define __FLT128_MAX__ 1.18973149535723176508575932662800702e+4932F128
+# 0 "<built-in>"
+#define __FLT128_NORM_MAX__ 1.18973149535723176508575932662800702e+4932F128
+# 0 "<built-in>"
+#define __FLT128_MIN__ 3.36210314311209350626267781732175260e-4932F128
+# 0 "<built-in>"
+#define __FLT128_EPSILON__ 1.92592994438723585305597794258492732e-34F128
+# 0 "<built-in>"
+#define __FLT128_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966F128
+# 0 "<built-in>"
+#define __FLT128_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT128_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT128_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT128_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __FLT32X_MANT_DIG__ 53
+# 0 "<built-in>"
+#define __FLT32X_DIG__ 15
+# 0 "<built-in>"
+#define __FLT32X_MIN_EXP__ (-1021)
+# 0 "<built-in>"
+#define __FLT32X_MIN_10_EXP__ (-307)
+# 0 "<built-in>"
+#define __FLT32X_MAX_EXP__ 1024
+# 0 "<built-in>"
+#define __FLT32X_MAX_10_EXP__ 308
+# 0 "<built-in>"
+#define __FLT32X_DECIMAL_DIG__ 17
+# 0 "<built-in>"
+#define __FLT32X_MAX__ 1.79769313486231570814527423731704357e+308F32x
+# 0 "<built-in>"
+#define __FLT32X_NORM_MAX__ 1.79769313486231570814527423731704357e+308F32x
+# 0 "<built-in>"
+#define __FLT32X_MIN__ 2.22507385850720138309023271733240406e-308F32x
+# 0 "<built-in>"
+#define __FLT32X_EPSILON__ 2.22044604925031308084726333618164062e-16F32x
+# 0 "<built-in>"
+#define __FLT32X_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F32x
+# 0 "<built-in>"
+#define __FLT32X_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT32X_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT32X_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT32X_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __FLT64X_MANT_DIG__ 64
+# 0 "<built-in>"
+#define __FLT64X_DIG__ 18
+# 0 "<built-in>"
+#define __FLT64X_MIN_EXP__ (-16381)
+# 0 "<built-in>"
+#define __FLT64X_MIN_10_EXP__ (-4931)
+# 0 "<built-in>"
+#define __FLT64X_MAX_EXP__ 16384
+# 0 "<built-in>"
+#define __FLT64X_MAX_10_EXP__ 4932
+# 0 "<built-in>"
+#define __FLT64X_DECIMAL_DIG__ 21
+# 0 "<built-in>"
+#define __FLT64X_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+# 0 "<built-in>"
+#define __FLT64X_NORM_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+# 0 "<built-in>"
+#define __FLT64X_MIN__ 3.36210314311209350626267781732175260e-4932F64x
+# 0 "<built-in>"
+#define __FLT64X_EPSILON__ 1.08420217248550443400745280086994171e-19F64x
+# 0 "<built-in>"
+#define __FLT64X_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951F64x
+# 0 "<built-in>"
+#define __FLT64X_HAS_DENORM__ 1
+# 0 "<built-in>"
+#define __FLT64X_HAS_INFINITY__ 1
+# 0 "<built-in>"
+#define __FLT64X_HAS_QUIET_NAN__ 1
+# 0 "<built-in>"
+#define __FLT64X_IS_IEC_60559__ 2
+# 0 "<built-in>"
+#define __DEC32_MANT_DIG__ 7
+# 0 "<built-in>"
+#define __DEC32_MIN_EXP__ (-94)
+# 0 "<built-in>"
+#define __DEC32_MAX_EXP__ 97
+# 0 "<built-in>"
+#define __DEC32_MIN__ 1E-95DF
+# 0 "<built-in>"
+#define __DEC32_MAX__ 9.999999E96DF
+# 0 "<built-in>"
+#define __DEC32_EPSILON__ 1E-6DF
+# 0 "<built-in>"
+#define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF
+# 0 "<built-in>"
+#define __DEC64_MANT_DIG__ 16
+# 0 "<built-in>"
+#define __DEC64_MIN_EXP__ (-382)
+# 0 "<built-in>"
+#define __DEC64_MAX_EXP__ 385
+# 0 "<built-in>"
+#define __DEC64_MIN__ 1E-383DD
+# 0 "<built-in>"
+#define __DEC64_MAX__ 9.999999999999999E384DD
+# 0 "<built-in>"
+#define __DEC64_EPSILON__ 1E-15DD
+# 0 "<built-in>"
+#define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD
+# 0 "<built-in>"
+#define __DEC128_MANT_DIG__ 34
+# 0 "<built-in>"
+#define __DEC128_MIN_EXP__ (-6142)
+# 0 "<built-in>"
+#define __DEC128_MAX_EXP__ 6145
+# 0 "<built-in>"
+#define __DEC128_MIN__ 1E-6143DL
+# 0 "<built-in>"
+#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL
+# 0 "<built-in>"
+#define __DEC128_EPSILON__ 1E-33DL
+# 0 "<built-in>"
+#define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL
+# 0 "<built-in>"
+#define __REGISTER_PREFIX__ 
+# 0 "<built-in>"
+#define __USER_LABEL_PREFIX__ 
+# 0 "<built-in>"
+#define __GNUC_STDC_INLINE__ 1
+# 0 "<built-in>"
+#define __NO_INLINE__ 1
+# 0 "<built-in>"
+#define __STRICT_ANSI__ 1
+# 0 "<built-in>"
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
+# 0 "<built-in>"
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
+# 0 "<built-in>"
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
+# 0 "<built-in>"
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
+# 0 "<built-in>"
+#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_INT_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_LONG_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_LLONG_LOCK_FREE 2
+# 0 "<built-in>"
+#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+# 0 "<built-in>"
+#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
+# 0 "<built-in>"
+#define __HAVE_SPECULATION_SAFE_VALUE 1
+# 0 "<built-in>"
+#define __GCC_HAVE_DWARF2_CFI_ASM 1
+# 0 "<built-in>"
+#define __PRAGMA_REDEFINE_EXTNAME 1
+# 0 "<built-in>"
+#define __SIZEOF_INT128__ 16
+# 0 "<built-in>"
+#define __SIZEOF_WCHAR_T__ 4
+# 0 "<built-in>"
+#define __SIZEOF_WINT_T__ 4
+# 0 "<built-in>"
+#define __SIZEOF_PTRDIFF_T__ 8
+# 0 "<built-in>"
+#define __amd64 1
+# 0 "<built-in>"
+#define __amd64__ 1
+# 0 "<built-in>"
+#define __x86_64 1
+# 0 "<built-in>"
+#define __x86_64__ 1
+# 0 "<built-in>"
+#define __SIZEOF_FLOAT80__ 16
+# 0 "<built-in>"
+#define __SIZEOF_FLOAT128__ 16
+# 0 "<built-in>"
+#define __ATOMIC_HLE_ACQUIRE 65536
+# 0 "<built-in>"
+#define __ATOMIC_HLE_RELEASE 131072
+# 0 "<built-in>"
+#define __GCC_ASM_FLAG_OUTPUTS__ 1
+# 0 "<built-in>"
+#define __k8 1
+# 0 "<built-in>"
+#define __k8__ 1
+# 0 "<built-in>"
+#define __code_model_small__ 1
+# 0 "<built-in>"
+#define __MMX__ 1
+# 0 "<built-in>"
+#define __SSE__ 1
+# 0 "<built-in>"
+#define __SSE2__ 1
+# 0 "<built-in>"
+#define __FXSR__ 1
+# 0 "<built-in>"
+#define __SSE_MATH__ 1
+# 0 "<built-in>"
+#define __SSE2_MATH__ 1
+# 0 "<built-in>"
+#define __MMX_WITH_SSE__ 1
+# 0 "<built-in>"
+#define __SEG_FS 1
+# 0 "<built-in>"
+#define __SEG_GS 1
+# 0 "<built-in>"
+#define __gnu_linux__ 1
+# 0 "<built-in>"
+#define __linux 1
+# 0 "<built-in>"
+#define __linux__ 1
+# 0 "<built-in>"
+#define __unix 1
+# 0 "<built-in>"
+#define __unix__ 1
+# 0 "<built-in>"
+#define __ELF__ 1
+# 0 "<built-in>"
+#define __DECIMAL_BID_FORMAT__ 1
+# 0 "<command-line>"
+#define _GNU_SOURCE 1
+# 0 "<command-line>"
+# 1 "/usr/include/stdc-predef.h" 1 3 4
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _STDC_PREDEF_H 1
+
+/* This header is separate from features.h so that the compiler can
+   include it implicitly at the start of every compilation.  It must
+   not itself include <features.h> or any other header that includes
+   <features.h> because the implicit include comes before any feature
+   test macros that may be defined in a source file before it first
+   explicitly includes a system header.  GCC knows the name of this
+   header in order to preinclude it.  */
+
+/* glibc's intent is to support the IEC 559 math functionality, real
+   and complex.  If the GCC (4.9 and later) predefined macros
+   specifying compiler intent are available, use them to determine
+   whether the overall intent is to support these features; otherwise,
+   presume an older compiler has intent to support these features and
+   define these macros by default.  */
+
+
+
+#define __STDC_IEC_559__ 1
+
+
+
+
+
+
+
+#define __STDC_IEC_559_COMPLEX__ 1
+
+
+
+
+
+/* wchar_t uses Unicode 10.0.0.  Version 10.0 of the Unicode Standard is
+   synchronized with ISO/IEC 10646:2017, fifth edition, plus
+   the following additions from Amendment 1 to the fifth edition:
+   - 56 emoji characters
+   - 285 hentaigana
+   - 3 additional Zanabazar Square characters */
+#define __STDC_ISO_10646__ 201706L
+
+# 0 "<command-line>" 2
+# 1 "../../..//src/libstdc++-v3/libsupc++/initializer_list"
+// std::initializer_list support -*- C++ -*-
+
+// Copyright (C) 2008-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file initializer_list
+ *  This is a Standard C++ Library header.
+ */
+
+
+#define _INITIALIZER_LIST 
+
+       
+# 34 "../../..//src/libstdc++-v3/libsupc++/initializer_list" 3
+
+
+
+
+
+#pragma GCC visibility push(default)
+
+# 1 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 1 3
+// Predefined symbols and macros -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/c++config.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{version}
+ */
+
+
+#define _GLIBCXX_CXX_CONFIG_H 1
+
+// The major release number for the GCC release the C++ library belongs to.
+#define _GLIBCXX_RELEASE 11
+
+// The datestamp of the C++ library in compressed ISO date format.
+#define __GLIBCXX__ 20210217
+
+// Macros for various attributes.
+//   _GLIBCXX_PURE
+//   _GLIBCXX_CONST
+//   _GLIBCXX_NORETURN
+//   _GLIBCXX_NOTHROW
+//   _GLIBCXX_VISIBILITY
+
+#define _GLIBCXX_PURE __attribute__ ((__pure__))
+
+
+
+#define _GLIBCXX_CONST __attribute__ ((__const__))
+
+
+
+#define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
+
+
+// See below for C++
+
+
+
+
+
+
+// Macros for visibility attributes.
+//   _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
+//   _GLIBCXX_VISIBILITY
+#define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY 1
+
+
+#define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
+
+
+
+
+
+
+// Macros for deprecated attributes.
+//   _GLIBCXX_USE_DEPRECATED
+//   _GLIBCXX_DEPRECATED
+//   _GLIBCXX_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX11_DEPRECATED
+//   _GLIBCXX11_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX17_DEPRECATED
+//   _GLIBCXX17_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX20_DEPRECATED( string-literal )
+//   _GLIBCXX20_DEPRECATED_SUGGEST( string-literal )
+
+#define _GLIBCXX_USE_DEPRECATED 1
+
+
+
+#define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
+#define _GLIBCXX_DEPRECATED_SUGGEST(ALT) __attribute__ ((__deprecated__ ("use '" ALT "' instead")))
+
+
+
+
+
+
+
+#define _GLIBCXX11_DEPRECATED _GLIBCXX_DEPRECATED
+#define _GLIBCXX11_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
+
+
+
+
+
+
+#define _GLIBCXX17_DEPRECATED [[__deprecated__]]
+#define _GLIBCXX17_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX20_DEPRECATED(MSG) 
+#define _GLIBCXX20_DEPRECATED_SUGGEST(ALT) 
+
+
+// Macros for ABI tag attributes.
+
+#define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))
+
+
+// Macro to warn about unused results.
+
+#define _GLIBCXX_NODISCARD [[__nodiscard__]]
+
+
+
+
+
+
+
+
+// Macro for constexpr, to support in mixed 03/0x mode.
+
+
+#define _GLIBCXX_CONSTEXPR constexpr
+#define _GLIBCXX_USE_CONSTEXPR constexpr
+
+
+
+
+
+
+
+
+#define _GLIBCXX14_CONSTEXPR constexpr
+
+
+
+
+
+
+
+#define _GLIBCXX17_CONSTEXPR constexpr
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX20_CONSTEXPR 
+
+
+
+
+
+#define _GLIBCXX17_INLINE inline
+
+
+
+
+
+// Macro for noexcept, to support in mixed 03/0x mode.
+
+
+#define _GLIBCXX_NOEXCEPT noexcept
+#define _GLIBCXX_NOEXCEPT_IF(...) noexcept(__VA_ARGS__)
+#define _GLIBCXX_USE_NOEXCEPT noexcept
+#define _GLIBCXX_THROW(_EXC) 
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
+
+
+
+
+#define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
+
+
+
+
+
+
+#define _GLIBCXX_NOEXCEPT_PARM , bool _NE
+#define _GLIBCXX_NOEXCEPT_QUAL noexcept (_NE)
+
+
+
+
+
+// Macro for extern template, ie controlling template linkage via use
+// of extern keyword on template declaration. As documented in the g++
+// manual, it inhibits all implicit instantiations and is used
+// throughout the library to avoid multiple weak definitions for
+// required types that are already explicitly instantiated in the
+// library binary. This substantially reduces the binary size of
+// resulting executables.
+// Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
+// templates only in basic_string, thus activating its debug-mode
+// checks even at -O0.
+#define _GLIBCXX_EXTERN_TEMPLATE 1
+
+/*
+  Outline of libstdc++ namespaces.
+
+  namespace std
+  {
+    namespace __debug { }
+    namespace __parallel { }
+    namespace __cxx1998 { }
+
+    namespace __detail {
+      namespace __variant { }				// C++17
+    }
+
+    namespace rel_ops { }
+
+    namespace tr1
+    {
+      namespace placeholders { }
+      namespace regex_constants { }
+      namespace __detail { }
+    }
+
+    namespace tr2 { }
+    
+    namespace decimal { }
+
+    namespace chrono { }				// C++11
+    namespace placeholders { }				// C++11
+    namespace regex_constants { }			// C++11
+    namespace this_thread { }				// C++11
+    inline namespace literals {				// C++14
+      inline namespace chrono_literals { }		// C++14
+      inline namespace complex_literals { }		// C++14
+      inline namespace string_literals { }		// C++14
+      inline namespace string_view_literals { }		// C++17
+    }
+  }
+
+  namespace abi { }
+
+  namespace __gnu_cxx
+  {
+    namespace __detail { }
+  }
+
+  For full details see:
+  http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
+*/
+namespace std
+{
+  typedef __SIZE_TYPE__ 	size_t;
+  typedef __PTRDIFF_TYPE__	ptrdiff_t;
+
+
+  typedef decltype(nullptr)	nullptr_t;
+
+}
+
+#define _GLIBCXX_USE_DUAL_ABI 1
+
+
+
+
+
+
+
+#define _GLIBCXX_USE_CXX11_ABI 1
+
+
+
+namespace std
+{
+  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
+}
+namespace __gnu_cxx
+{
+  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
+}
+#define _GLIBCXX_NAMESPACE_CXX11 __cxx11::
+#define _GLIBCXX_BEGIN_NAMESPACE_CXX11 namespace __cxx11 {
+#define _GLIBCXX_END_NAMESPACE_CXX11 }
+#define _GLIBCXX_DEFAULT_ABI_TAG _GLIBCXX_ABI_TAG_CXX11
+
+
+
+
+
+
+
+// Defined if inline namespaces are used for versioning.
+#define _GLIBCXX_INLINE_VERSION 0
+
+// Inline namespace for symbol versioning.
+# 350 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+#define _GLIBCXX_BEGIN_NAMESPACE_VERSION 
+#define _GLIBCXX_END_NAMESPACE_VERSION 
+
+
+// Inline namespaces for special modes: debug, parallel.
+# 392 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+
+// Macros for namespace scope. Either namespace std:: or the name
+// of some nested namespace within it corresponding to the active mode.
+// _GLIBCXX_STD_A
+// _GLIBCXX_STD_C
+//
+// Macros for opening/closing conditional namespaces.
+// _GLIBCXX_BEGIN_NAMESPACE_ALGO
+// _GLIBCXX_END_NAMESPACE_ALGO
+// _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+// _GLIBCXX_END_NAMESPACE_CONTAINER
+
+
+
+
+
+
+#define _GLIBCXX_STD_C std
+#define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER 
+#define _GLIBCXX_END_NAMESPACE_CONTAINER 
+
+
+
+
+
+
+
+
+#define _GLIBCXX_STD_A std
+#define _GLIBCXX_BEGIN_NAMESPACE_ALGO 
+#define _GLIBCXX_END_NAMESPACE_ALGO 
+
+
+// GLIBCXX_ABI Deprecated
+// Define if compatibility should be provided for -mlong-double-64.
+#undef _GLIBCXX_LONG_DOUBLE_COMPAT
+// Define if compatibility should be provided for alternative 128-bit long
+// double formats.
+#undef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
+
+// Inline namespaces for long double 128 modes.
+# 449 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+
+# 459 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+#define _GLIBCXX_NAMESPACE_LDBL 
+#define _GLIBCXX_BEGIN_NAMESPACE_LDBL 
+#define _GLIBCXX_END_NAMESPACE_LDBL 
+
+
+
+#define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_CXX11
+#define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_CXX11
+#define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_CXX11
+
+
+
+
+
+
+
+
+// Debug Mode implies checking assertions.
+
+
+
+
+// Disable std::string explicit instantiation declarations in order to assert.
+
+
+
+
+
+// Assert.
+# 509 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+
+
+
+
+#define __glibcxx_assert_2(_Condition) 
+
+
+// Macros for race detectors.
+// _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
+// _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
+// atomic (lock-free) synchronization to race detectors:
+// the race detector will infer a happens-before arc from the former to the
+// latter when they share the same argument pointer.
+//
+// The most frequent use case for these macros (and the only case in the
+// current implementation of the library) is atomic reference counting:
+//   void _M_remove_reference()
+//   {
+//     _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
+//     if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
+//       {
+//         _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
+//         _M_destroy(__a);
+//       }
+//   }
+// The annotations in this example tell the race detector that all memory
+// accesses occurred when the refcount was positive do not race with
+// memory accesses which occurred after the refcount became zero.
+
+#define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) 
+
+
+#define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) 
+
+
+// Macros for C linkage: define extern "C" linkage only when using C++.
+#define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
+#define _GLIBCXX_END_EXTERN_C }
+
+#define _GLIBCXX_USE_ALLOCATOR_NEW 1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+// First includes.
+
+// Pick up any OS-specific definitions.
+# 1 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/os_defines.h" 1 3
+// Specific definitions for GNU/Linux  -*- C++ -*-
+
+// Copyright (C) 2000-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/os_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+
+#define _GLIBCXX_OS_DEFINES 1
+
+// System-specific #define, typedefs, corrections, etc, go here.  This
+// file will come before all others.
+
+// This keeps isanum, et al from being propagated as macros.
+#define __NO_CTYPE 1
+
+# 1 "/usr/include/features.h" 1 3 4
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _FEATURES_H 1
+
+/* These are defined by the user (or the compiler)
+   to specify the desired environment:
+
+   __STRICT_ANSI__	ISO Standard C.
+   _ISOC99_SOURCE	Extensions to ISO C89 from ISO C99.
+   _ISOC11_SOURCE	Extensions to ISO C99 from ISO C11.
+   __STDC_WANT_LIB_EXT2__
+			Extensions to ISO C99 from TR 27431-2:2010.
+   __STDC_WANT_IEC_60559_BFP_EXT__
+			Extensions to ISO C11 from TS 18661-1:2014.
+   __STDC_WANT_IEC_60559_FUNCS_EXT__
+			Extensions to ISO C11 from TS 18661-4:2015.
+   __STDC_WANT_IEC_60559_TYPES_EXT__
+			Extensions to ISO C11 from TS 18661-3:2015.
+
+   _POSIX_SOURCE	IEEE Std 1003.1.
+   _POSIX_C_SOURCE	If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
+			if >=199309L, add IEEE Std 1003.1b-1993;
+			if >=199506L, add IEEE Std 1003.1c-1995;
+			if >=200112L, all of IEEE 1003.1-2004
+			if >=200809L, all of IEEE 1003.1-2008
+   _XOPEN_SOURCE	Includes POSIX and XPG things.  Set to 500 if
+			Single Unix conformance is wanted, to 600 for the
+			sixth revision, to 700 for the seventh revision.
+   _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
+   _LARGEFILE_SOURCE	Some more functions for correct standard I/O.
+   _LARGEFILE64_SOURCE	Additional functionality from LFS for large files.
+   _FILE_OFFSET_BITS=N	Select default filesystem interface.
+   _ATFILE_SOURCE	Additional *at interfaces.
+   _GNU_SOURCE		All of the above, plus GNU extensions.
+   _DEFAULT_SOURCE	The default set of features (taking precedence over
+			__STRICT_ANSI__).
+
+   _FORTIFY_SOURCE	Add security hardening to many library functions.
+			Set to 1 or 2; 2 performs stricter checks than 1.
+
+   _REENTRANT, _THREAD_SAFE
+			Obsolete; equivalent to _POSIX_C_SOURCE=199506L.
+
+   The `-ansi' switch to the GNU C compiler, and standards conformance
+   options such as `-std=c99', define __STRICT_ANSI__.  If none of
+   these are defined, or if _DEFAULT_SOURCE is defined, the default is
+   to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
+   200809L, as well as enabling miscellaneous functions from BSD and
+   SVID.  If more than one of these are defined, they accumulate.  For
+   example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together
+   give you ISO C, 1003.1, and 1003.2, but nothing else.
+
+   These are defined by this file and are used by the
+   header files to decide what to declare or define:
+
+   __GLIBC_USE (F)	Define things from feature set F.  This is defined
+			to 1 or 0; the subsequent macros are either defined
+			or undefined, and those tests should be moved to
+			__GLIBC_USE.
+   __USE_ISOC11		Define ISO C11 things.
+   __USE_ISOC99		Define ISO C99 things.
+   __USE_ISOC95		Define ISO C90 AMD1 (C95) things.
+   __USE_ISOCXX11	Define ISO C++11 things.
+   __USE_POSIX		Define IEEE Std 1003.1 things.
+   __USE_POSIX2		Define IEEE Std 1003.2 things.
+   __USE_POSIX199309	Define IEEE Std 1003.1, and .1b things.
+   __USE_POSIX199506	Define IEEE Std 1003.1, .1b, .1c and .1i things.
+   __USE_XOPEN		Define XPG things.
+   __USE_XOPEN_EXTENDED	Define X/Open Unix things.
+   __USE_UNIX98		Define Single Unix V2 things.
+   __USE_XOPEN2K        Define XPG6 things.
+   __USE_XOPEN2KXSI     Define XPG6 XSI things.
+   __USE_XOPEN2K8       Define XPG7 things.
+   __USE_XOPEN2K8XSI    Define XPG7 XSI things.
+   __USE_LARGEFILE	Define correct standard I/O things.
+   __USE_LARGEFILE64	Define LFS things with separate names.
+   __USE_FILE_OFFSET64	Define 64bit interface as default.
+   __USE_MISC		Define things from 4.3BSD or System V Unix.
+   __USE_ATFILE		Define *at interfaces and AT_* constants for them.
+   __USE_GNU		Define GNU extensions.
+   __USE_FORTIFY_LEVEL	Additional security measures used, according to level.
+
+   The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
+   defined by this file unconditionally.  `__GNU_LIBRARY__' is provided
+   only for compatibility.  All new code should use the other symbols
+   to test for features.
+
+   All macros listed above as possibly being defined by this file are
+   explicitly undefined if they are not explicitly defined.
+   Feature-test macros that are not defined by the user or compiler
+   but are implied by the other feature-test macros defined (or by the
+   lack of any definitions) are defined by the file.
+
+   ISO C feature test macros depend on the definition of the macro
+   when an affected header is included, not when the first system
+   header is included, and so they are handled in
+   <bits/libc-header-start.h>, which does not have a multiple include
+   guard.  Feature test macros that can be handled from the first
+   system header included are handled here.  */
+
+
+/* Undefine everything, so we get a clean slate.  */
+#undef __USE_ISOC11
+#undef __USE_ISOC99
+#undef __USE_ISOC95
+#undef __USE_ISOCXX11
+#undef __USE_POSIX
+#undef __USE_POSIX2
+#undef __USE_POSIX199309
+#undef __USE_POSIX199506
+#undef __USE_XOPEN
+#undef __USE_XOPEN_EXTENDED
+#undef __USE_UNIX98
+#undef __USE_XOPEN2K
+#undef __USE_XOPEN2KXSI
+#undef __USE_XOPEN2K8
+#undef __USE_XOPEN2K8XSI
+#undef __USE_LARGEFILE
+#undef __USE_LARGEFILE64
+#undef __USE_FILE_OFFSET64
+#undef __USE_MISC
+#undef __USE_ATFILE
+#undef __USE_GNU
+#undef __USE_FORTIFY_LEVEL
+#undef __KERNEL_STRICT_NAMES
+#undef __GLIBC_USE_DEPRECATED_GETS
+
+/* Suppress kernel-name space pollution unless user expressedly asks
+   for it.  */
+
+#define __KERNEL_STRICT_NAMES 
+
+
+/* Convenience macro to test the version of gcc.
+   Use like this:
+   #if __GNUC_PREREQ (2,8)
+   ... code requiring gcc 2.8 or later ...
+   #endif
+   Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was
+   added in 2.0.  */
+
+#define __GNUC_PREREQ(maj,min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+
+
+
+
+
+/* Similarly for clang.  Features added to GCC after version 4.2 may
+   or may not also be available in clang, and clang's definitions of
+   __GNUC(_MINOR)__ are fixed at 4 and 2 respectively.  Not all such
+   features can be queried via __has_extension/__has_feature.  */
+
+
+
+
+#define __glibc_clang_prereq(maj,min) 0
+
+
+/* Whether to use feature set F.  */
+#define __GLIBC_USE(F) __GLIBC_USE_ ## F
+
+/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for
+   _DEFAULT_SOURCE.  If _DEFAULT_SOURCE is present we do not
+   issue a warning; the expectation is that the source is being
+   transitioned to use the new macro.  */
+
+
+
+
+
+
+
+/* If _GNU_SOURCE was defined by the user, turn on all the other features.  */
+
+#undef _ISOC95_SOURCE
+#define _ISOC95_SOURCE 1
+#undef _ISOC99_SOURCE
+#define _ISOC99_SOURCE 1
+#undef _ISOC11_SOURCE
+#define _ISOC11_SOURCE 1
+#undef _POSIX_SOURCE
+#define _POSIX_SOURCE 1
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 700
+#undef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED 1
+#undef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE 1
+#undef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE 1
+#undef _ATFILE_SOURCE
+#define _ATFILE_SOURCE 1
+
+
+/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined,
+   define _DEFAULT_SOURCE.  */
+
+
+
+
+
+#undef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE 1
+
+
+/* This is to enable the ISO C11 extension.  */
+
+
+#define __USE_ISOC11 1
+
+
+/* This is to enable the ISO C99 extension.  */
+
+
+#define __USE_ISOC99 1
+
+
+/* This is to enable the ISO C90 Amendment 1:1995 extension.  */
+
+
+#define __USE_ISOC95 1
+
+
+
+/* This is to enable compatibility for ISO C++17.  */
+
+#define __USE_ISOC11 1
+
+/* This is to enable compatibility for ISO C++11.
+   Check the temporary macro for now, too.  */
+
+#define __USE_ISOCXX11 1
+#define __USE_ISOC99 1
+
+
+
+/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE
+   is defined, use POSIX.1-2008 (or another version depending on
+   _XOPEN_SOURCE).  */
+
+
+
+
+#undef _POSIX_SOURCE
+#define _POSIX_SOURCE 1
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+
+
+# 283 "/usr/include/features.h" 3 4
+
+/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
+   defined in all multithreaded code.  GNU libc has not required this
+   for many years.  We now treat them as compatibility synonyms for
+   _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with
+   comprehensive support for multithreaded code.  Using them never
+   lowers the selected level of POSIX conformance, only raises it.  */
+
+
+
+
+
+
+
+
+
+
+#define __USE_POSIX 1
+
+
+
+#define __USE_POSIX2 1
+
+
+
+#define __USE_POSIX199309 1
+
+
+
+#define __USE_POSIX199506 1
+
+
+
+#define __USE_XOPEN2K 1
+#undef __USE_ISOC95
+#define __USE_ISOC95 1
+#undef __USE_ISOC99
+#define __USE_ISOC99 1
+
+
+
+#define __USE_XOPEN2K8 1
+#undef _ATFILE_SOURCE
+#define _ATFILE_SOURCE 1
+
+
+
+#define __USE_XOPEN 1
+
+#define __USE_XOPEN_EXTENDED 1
+#define __USE_UNIX98 1
+#undef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE 1
+
+
+#define __USE_XOPEN2K8 1
+#define __USE_XOPEN2K8XSI 1
+
+#define __USE_XOPEN2K 1
+#define __USE_XOPEN2KXSI 1
+#undef __USE_ISOC95
+#define __USE_ISOC95 1
+#undef __USE_ISOC99
+#define __USE_ISOC99 1
+
+
+
+
+
+
+
+
+
+#define __USE_LARGEFILE 1
+
+
+
+#define __USE_LARGEFILE64 1
+
+
+
+
+
+
+
+#define __USE_MISC 1
+
+
+
+#define __USE_ATFILE 1
+
+
+
+#define __USE_GNU 1
+
+
+# 390 "/usr/include/features.h" 3 4
+
+#define __USE_FORTIFY_LEVEL 0
+
+
+/* The function 'gets' existed in C89, but is impossible to use
+   safely.  It has been removed from ISO C11 and ISO C++14.  Note: for
+   compatibility with various implementations of <cstdio>, this test
+   must consider only the value of __cplusplus when compiling C++.  */
+
+#define __GLIBC_USE_DEPRECATED_GETS 0
+
+
+
+
+/* Get definitions of __STDC_* predefined macros, if the compiler has
+   not preincluded this header automatically.  */
+
+
+/* This macro indicates that the installed library is the GNU C Library.
+   For historic reasons the value now is 6 and this will stay from now
+   on.  The use of this variable is deprecated.  Use __GLIBC__ and
+   __GLIBC_MINOR__ now (see below) when you want to test for a specific
+   GNU C library version and use the values in <gnu/lib-names.h> to get
+   the sonames of the shared libraries.  */
+#undef __GNU_LIBRARY__
+#define __GNU_LIBRARY__ 6
+
+/* Major and minor version number of the GNU C library package.  Use
+   these macros to test for features in specific releases.  */
+#define __GLIBC__ 2
+#define __GLIBC_MINOR__ 28
+
+#define __GLIBC_PREREQ(maj,min) ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
+
+
+/* This is here only because every header file already includes this one.  */
+
+
+# 1 "/usr/include/sys/cdefs.h" 1 3 4
+/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _SYS_CDEFS_H 1
+
+/* We are almost always included from features.h. */
+
+
+
+
+/* The GNU libc does not support any K&R compilers or the traditional mode
+   of ISO C compilers anymore.  Check for some of the combinations not
+   anymore supported.  */
+
+
+
+
+/* Some user header file might have defined this before.  */
+#undef __P
+#undef __PMT
+
+
+
+/* All functions, except those with callbacks or those that
+   synchronize memory, are leaf functions.  */
+
+#define __LEAF , __leaf__
+#define __LEAF_ATTR __attribute__ ((__leaf__))
+
+
+
+
+
+/* GCC can always grok prototypes.  For C++ programs we add throw()
+   to help it optimize the function calls.  But this works only with
+   gcc 2.8.x and egcs.  For gcc 3.2 and up we even mark C functions
+   as non-throwing using a function attribute since programs can use
+   the -fexceptions options for C code as well.  */
+
+
+
+
+
+
+
+#define __THROW throw ()
+#define __THROWNL throw ()
+#define __NTH(fct) __LEAF_ATTR fct throw ()
+#define __NTHNL(fct) fct throw ()
+
+
+
+
+
+
+
+
+# 87 "/usr/include/sys/cdefs.h" 3 4
+
+/* Compilers that are not clang may object to
+       #if defined __clang__ && __has_extension(...)
+   even though they do not need to evaluate the right-hand side of the &&.  */
+
+
+
+#define __glibc_clang_has_extension(ext) 0
+
+
+/* These two macros are not used in glibc anymore.  They are kept here
+   only because some other projects expect the macros to be defined.  */
+#define __P(args) args
+#define __PMT(args) args
+
+/* For these things, GCC behaves the ANSI way normally,
+   and the non-ANSI way under -traditional.  */
+
+#define __CONCAT(x,y) x ## y
+#define __STRING(x) #x
+
+/* This is not a typedef so `const __ptr_t' does the right thing.  */
+#define __ptr_t void *
+
+
+/* C++ needs to know that types and declarations are C, not C++.  */
+
+#define __BEGIN_DECLS extern "C" {
+#define __END_DECLS }
+
+
+
+
+
+
+/* Fortify support.  */
+#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
+#define __bos0(ptr) __builtin_object_size (ptr, 0)
+
+
+#define __warndecl(name,msg) extern void name (void) __attribute__((__warning__ (msg)))
+
+#define __warnattr(msg) __attribute__((__warning__ (msg)))
+#define __errordecl(name,msg) extern void name (void) __attribute__((__error__ (msg)))
+
+
+
+
+
+
+
+/* Support for flexible arrays.
+   Headers that should use flexible arrays only if they're "real"
+   (e.g. only if they won't affect sizeof()) should test
+   #if __glibc_c99_flexarr_available.  */
+
+
+
+
+/* GCC 2.97 supports C99 flexible array members as an extension,
+   even when in C89 mode or compiling C++ (any version).  */
+#define __flexarr []
+#define __glibc_c99_flexarr_available 1
+# 160 "/usr/include/sys/cdefs.h" 3 4
+
+
+/* __asm__ ("xyz") is used throughout the headers to rename functions
+   at the assembly language level.  This is wrapped by the __REDIRECT
+   macro, in order to support compilers that can do this some other
+   way.  When compilers don't support asm-names at all, we have to do
+   preprocessor tricks instead (which don't have exactly the right
+   semantics, but it's the best we can do).
+
+   Example:
+   int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
+
+
+
+#define __REDIRECT(name,proto,alias) name proto __asm__ (__ASMNAME (#alias))
+
+#define __REDIRECT_NTH(name,proto,alias) name proto __THROW __asm__ (__ASMNAME (#alias))
+
+#define __REDIRECT_NTHNL(name,proto,alias) name proto __THROWNL __asm__ (__ASMNAME (#alias))
+
+
+
+
+
+
+
+#define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define __ASMNAME2(prefix,cname) __STRING (prefix) cname
+
+/*
+#elif __SOME_OTHER_COMPILER__
+
+# define __REDIRECT(name, proto, alias) name proto; \
+	_Pragma("let " #name " = " #alias)
+*/
+
+
+/* GCC has various useful declarations that can be made with the
+   `__attribute__' syntax.  All of the ways we use this do fine if
+   they are omitted for compilers that don't understand it. */
+
+
+
+
+/* At some point during the gcc 2.96 development the `malloc' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_malloc__ __attribute__ ((__malloc__))
+
+
+
+
+/* Tell the compiler which arguments to an allocation function
+   indicate the size of the allocation.  */
+
+#define __attribute_alloc_size__(params) __attribute__ ((__alloc_size__ params))
+
+
+
+
+
+/* At some point during the gcc 2.96 development the `pure' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_pure__ __attribute__ ((__pure__))
+
+
+
+
+/* This declaration tells the compiler that the value is constant.  */
+
+#define __attribute_const__ __attribute__ ((__const__))
+
+
+
+
+/* At some point during the gcc 3.1 development the `used' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_used__ __attribute__ ((__used__))
+#define __attribute_noinline__ __attribute__ ((__noinline__))
+
+
+
+
+
+/* Since version 3.2, gcc allows marking deprecated functions.  */
+
+#define __attribute_deprecated__ __attribute__ ((__deprecated__))
+
+
+
+
+/* Since version 4.5, gcc also allows one to specify the message printed
+   when a deprecated function is used.  clang claims to be gcc 4.2, but
+   may also support this feature.  */
+
+
+#define __attribute_deprecated_msg__(msg) __attribute__ ((__deprecated__ (msg)))
+
+
+
+
+
+/* At some point during the gcc 2.8 development the `format_arg' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.
+   If several `format_arg' attributes are given for the same function, in
+   gcc-3.0 and older, all but the last one are ignored.  In newer gccs,
+   all designated arguments are considered.  */
+
+#define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
+
+
+
+
+/* At some point during the gcc 2.97 development the `strfmon' format
+   attribute for functions was introduced.  We don't want to use it
+   unconditionally (although this would be possible) since it
+   generates warnings.  */
+
+#define __attribute_format_strfmon__(a,b) __attribute__ ((__format__ (__strfmon__, a, b)))
+
+
+
+
+
+/* The nonull function attribute allows to mark pointer parameters which
+   must not be NULL.  */
+
+#define __nonnull(params) __attribute__ ((__nonnull__ params))
+
+
+
+
+/* If fortification mode, we warn about unused results of certain
+   function calls which can lead to problems.  */
+
+#define __attribute_warn_unused_result__ __attribute__ ((__warn_unused_result__))
+
+
+
+
+
+
+
+
+#define __wur 
+
+
+/* Forces a function to be always inlined.  */
+
+/* The Linux kernel defines __always_inline in stddef.h (283d7573), and
+   it conflicts with this definition.  Therefore undefine it first to
+   allow either header to be included first.  */
+#undef __always_inline
+#define __always_inline __inline __attribute__ ((__always_inline__))
+
+
+
+
+
+/* Associate error messages with the source location of the call site rather
+   than with the source location inside the function.  */
+
+#define __attribute_artificial__ __attribute__ ((__artificial__))
+
+
+
+
+/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
+   inline semantics, unless -fgnu89-inline is used.  Using __GNUC_STDC_INLINE__
+   or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
+   older than 4.3 may define these macros and still not guarantee GNU inlining
+   semantics.
+
+   clang++ identifies itself as gcc-4.2, but has support for GNU inlining
+   semantics, that can be checked fot by using the __GNUC_STDC_INLINE_ and
+   __GNUC_GNU_INLINE__ macro definitions.  */
+
+
+
+
+#define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
+#define __extern_always_inline extern __always_inline __attribute__ ((__gnu_inline__))
+
+
+
+
+
+
+
+
+#define __fortify_function __extern_always_inline __attribute_artificial__
+
+
+/* GCC 4.3 and above allow passing all anonymous arguments of an
+   __extern_always_inline function to some other vararg function.  */
+
+#define __va_arg_pack() __builtin_va_arg_pack ()
+#define __va_arg_pack_len() __builtin_va_arg_pack_len ()
+
+
+/* It is possible to compile containing GCC extensions even if GCC is
+   run in pedantic mode if the uses are carefully marked using the
+   `__extension__' keyword.  But this is not generally available before
+   version 2.8.  */
+
+
+
+
+/* __restrict is known in EGCS 1.2 and above. */
+
+
+
+
+
+
+
+
+/* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is
+     array_name[restrict]
+   GCC 3.1 supports this.  */
+
+
+
+
+#define __restrict_arr 
+# 399 "/usr/include/sys/cdefs.h" 3 4
+
+
+
+#define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
+#define __glibc_likely(cond) __builtin_expect ((cond), 1)
+
+
+
+
+
+
+#define __glibc_has_attribute(attr) __has_attribute (attr)
+
+
+
+
+# 424 "/usr/include/sys/cdefs.h" 3 4
+
+
+/* Describes a char array whose address can safely be passed as the first
+   argument to strncpy and strncat, as the char array is not necessarily
+   a NUL-terminated string.  */
+#define __attribute_nonstring__ __attribute__ ((__nonstring__))
+
+
+
+
+
+
+
+
+
+
+
+
+# 1 "/usr/include/bits/wordsize.h" 1 3 4
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+# 443 "/usr/include/sys/cdefs.h" 2 3 4
+# 1 "/usr/include/bits/long-double.h" 1 3 4
+/* Properties of long double type.  ldbl-96 version.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */
+# 444 "/usr/include/sys/cdefs.h" 2 3 4
+
+# 464 "/usr/include/sys/cdefs.h" 3 4
+
+#define __LDBL_REDIR1(name,proto,alias) name proto
+#define __LDBL_REDIR(name,proto) name proto
+#define __LDBL_REDIR1_NTH(name,proto,alias) name proto __THROW
+#define __LDBL_REDIR_NTH(name,proto) name proto __THROW
+#define __LDBL_REDIR_DECL(name) 
+
+#define __REDIRECT_LDBL(name,proto,alias) __REDIRECT (name, proto, alias)
+#define __REDIRECT_NTH_LDBL(name,proto,alias) __REDIRECT_NTH (name, proto, alias)
+
+
+
+
+/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE.  This is
+   intended for use in preprocessor macros.
+
+   Note: MESSAGE must be a _single_ string; concatenation of string
+   literals is not supported.  */
+
+#define __glibc_macro_warning1(message) _Pragma (#message)
+#define __glibc_macro_warning(message) __glibc_macro_warning1 (GCC warning message)
+
+
+
+
+
+/* Generic selection (ISO C11) is a C-only feature, available in GCC
+   since version 4.9.  Previous versions do not provide generic
+   selection, even though they might set __STDC_VERSION__ to 201112L,
+   when in -std=c11 mode.  Thus, we must check for !defined __GNUC__
+   when testing __STDC_VERSION__ for generic selection support.
+   On the other hand, Clang also defines __GNUC__, so a clang-specific
+   check is required to enable the use of generic selection.  */
+
+
+
+
+
+
+
+#define __HAVE_GENERIC_SELECTION 0
+
+
+# 429 "/usr/include/features.h" 2 3 4
+
+
+/* If we don't have __REDIRECT, prototypes will be missing if
+   __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
+
+
+
+
+
+
+
+/* Decide whether we can define 'extern inline' functions in headers.  */
+
+
+
+
+
+
+
+/* This is here only because every header file already includes this one.
+   Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
+   <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
+   that will always return failure (and set errno to ENOSYS).  */
+# 1 "/usr/include/gnu/stubs.h" 1 3 4
+/* This file is automatically generated.
+   This file selects the right generated file of `__stub_FUNCTION' macros
+   based on the architecture being compiled for.  */
+
+
+
+
+
+
+# 1 "/usr/include/gnu/stubs-64.h" 1 3 4
+/* This file is automatically generated.
+   It defines a symbol `__stub_FUNCTION' for each function
+   in the C library which is a stub, meaning it will fail
+   every time called, usually setting errno to ENOSYS.  */
+
+
+
+
+
+#define __stub___compat_bdflush 
+#define __stub_chflags 
+#define __stub_fattach 
+#define __stub_fchflags 
+#define __stub_fdetach 
+#define __stub_getmsg 
+#define __stub_gtty 
+#define __stub_lchmod 
+#define __stub_putmsg 
+#define __stub_revoke 
+#define __stub_setlogin 
+#define __stub_sigreturn 
+#define __stub_sstk 
+#define __stub_stty 
+# 11 "/usr/include/gnu/stubs.h" 2 3 4
+
+# 453 "/usr/include/features.h" 2 3 4
+
+
+# 40 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/os_defines.h" 2 3
+
+// Provide a declaration for the possibly deprecated gets function, as
+// glibc 2.15 and later does not declare gets for ISO C11 when
+// __GNU_SOURCE is defined.
+
+#undef _GLIBCXX_HAVE_GETS
+
+
+// Glibc 2.23 removed the obsolete isinf and isnan declarations. Check the
+// version dynamically in case it has changed since libstdc++ was configured.
+#define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23)
+
+
+// Since glibc 2.27 pthread_self() is usable without linking to libpthread.
+#define _GLIBCXX_NATIVE_THREAD_ID pthread_self()
+# 63 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/os_defines.h" 3
+
+# 569 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 2 3
+
+// Pick up any CPU-specific definitions.
+# 1 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/cpu_defines.h" 1 3
+// Specific definitions for generic platforms  -*- C++ -*-
+
+// Copyright (C) 2005-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cpu_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+
+#define _GLIBCXX_CPU_DEFINES 1
+
+# 572 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 2 3
+
+// If platform uses neither visibility nor psuedo-visibility,
+// specify empty default for namespace annotation macros.
+
+#define _GLIBCXX_PSEUDO_VISIBILITY(V) 
+
+
+// Certain function definitions that are meant to be overridable from
+// user code are decorated with this macro.  For some targets, this
+// macro causes these definitions to be weak.
+
+#define _GLIBCXX_WEAK_DEFINITION 
+
+
+// By default, we assume that __GXX_WEAK__ also means that there is support
+// for declaring functions as weak while not defining such functions.  This
+// allows for referring to functions provided by other libraries (e.g.,
+// libitm) without depending on them if the respective features are not used.
+
+#define _GLIBCXX_USE_WEAK_REF __GXX_WEAK__
+
+
+// Conditionally enable annotations for the Transactional Memory TS on C++11.
+// Most of the following conditions are due to limitations in the current
+// implementation.
+
+
+
+
+
+
+
+#define _GLIBCXX_TXN_SAFE 
+#define _GLIBCXX_TXN_SAFE_DYN 
+
+
+
+// In C++17 mathematical special functions are in namespace std.
+#define _GLIBCXX_USE_STD_SPEC_FUNCS 1
+
+
+
+
+
+// The remainder of the prewritten config is automatic; all the
+// user hooks are listed above.
+
+// Create a boolean flag to be used to determine if --fast-math is set.
+
+
+
+#define _GLIBCXX_FAST_MATH 0
+
+
+// This marks string literals in header files to be extracted for eventual
+// translation.  It is primarily used for messages in thrown exceptions; see
+// src/functexcept.cc.  We use __N because the more traditional _N is used
+// for something else under certain OSes (see BADNAMES).
+#define __N(msgid) (msgid)
+
+// For example, <windows.h> is known to #define min and max as macros...
+#undef min
+#undef max
+
+// N.B. these _GLIBCXX_USE_C99_XXX macros are defined unconditionally
+// so they should be tested with #if not with #ifdef.
+
+
+#define _GLIBCXX_USE_C99_MATH _GLIBCXX11_USE_C99_MATH
+
+
+#define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX11_USE_C99_COMPLEX
+
+
+#define _GLIBCXX_USE_C99_STDIO _GLIBCXX11_USE_C99_STDIO
+
+
+#define _GLIBCXX_USE_C99_STDLIB _GLIBCXX11_USE_C99_STDLIB
+
+
+#define _GLIBCXX_USE_C99_WCHAR _GLIBCXX11_USE_C99_WCHAR
+
+# 671 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 3
+
+// Unless explicitly specified, enable char8_t extensions only if the core
+// language char8_t feature macro is defined.
+
+
+
+
+
+
+
+
+
+/* Define if __float128 is supported on this host.  */
+
+/* For powerpc64 don't use __float128 when it's the same type as long double. */
+
+#define _GLIBCXX_USE_FLOAT128 1
+
+
+
+// Define if float has the IEEE binary32 format.
+
+
+
+#define _GLIBCXX_FLOAT_IS_IEEE_BINARY32 1
+
+
+// Define if double has the IEEE binary64 format.
+
+
+
+#define _GLIBCXX_DOUBLE_IS_IEEE_BINARY64 1
+
+
+
+
+
+
+
+#define _GLIBCXX_HAS_BUILTIN(B) __has_builtin(B)
+
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_SAME 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
+
+
+#undef _GLIBCXX_HAS_BUILTIN
+
+
+#define __glibcxx_assert_1(_Condition) if (__builtin_is_constant_evaluated()) { void __failed_assertion(); if (!bool(_Condition)) __failed_assertion(); } else
+
+
+
+
+
+
+
+
+
+
+
+#define __glibcxx_assert(_Condition) do { __glibcxx_assert_1(_Condition) { __glibcxx_assert_2(_Condition); } } while (false)
+
+
+
+
+
+
+// PSTL configuration
+
+
+// This header is not installed for freestanding:
+
+// Preserved here so we have some idea which version of upstream we've pulled in
+// #define PSTL_VERSION 9000
+
+// For now this defaults to being based on the presence of Thread Building Blocks
+
+#define _GLIBCXX_USE_TBB_PAR_BACKEND __has_include(<tbb/tbb.h>)
+
+// This section will need some rework when a new (default) backend type is added
+
+
+
+#define _PSTL_PAR_BACKEND_SERIAL 
+
+
+#define _PSTL_ASSERT(_Condition) __glibcxx_assert(_Condition)
+#define _PSTL_ASSERT_MSG(_Condition,_Message) __glibcxx_assert(_Condition)
+
+# 1 "../x86_64-pc-linux-gnu/libstdc++-v3/include/pstl/pstl_config.h" 1 3
+// -*- C++ -*-
+//===-- pstl_config.h -----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+
+#define _PSTL_CONFIG_H 
+
+// The version is XYYZ, where X is major, YY is minor, and Z is patch (i.e. X.YY.Z)
+#define _PSTL_VERSION 12000
+#define _PSTL_VERSION_MAJOR (_PSTL_VERSION / 1000)
+#define _PSTL_VERSION_MINOR ((_PSTL_VERSION % 1000) / 10)
+#define _PSTL_VERSION_PATCH (_PSTL_VERSION % 10)
+
+
+
+
+
+// Check the user-defined macro for warnings
+
+
+
+
+
+#define _PSTL_USAGE_WARNINGS 0
+
+
+// Portability "#pragma" definition
+
+
+
+#define _PSTL_PRAGMA(x) _Pragma(#x)
+
+
+#define _PSTL_STRING_AUX(x) #x
+#define _PSTL_STRING(x) _PSTL_STRING_AUX(x)
+#define _PSTL_STRING_CONCAT(x,y) x #y
+
+
+
+
+
+
+#define _PSTL_HIDE_FROM_ABI_PUSH 
+#define _PSTL_HIDE_FROM_ABI_POP 
+
+
+// note that when ICC or Clang is in use, _PSTL_GCC_VERSION might not fully match
+// the actual GCC version on the system.
+#define _PSTL_GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+
+
+
+
+
+
+// Enable SIMD for compilers that support OpenMP 4.0
+
+
+#define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
+#define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
+#define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
+# 76 "../x86_64-pc-linux-gnu/libstdc++-v3/include/pstl/pstl_config.h" 3
+
+
+
+
+#define _PSTL_PRAGMA_FORCEINLINE 
+
+
+
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_SCAN(PRM) 
+#define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 
+#define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 
+
+
+// Should be defined to 1 for environments with a vendor implementation of C++17 execution policies
+#define _PSTL_CPP17_EXECUTION_POLICIES_PRESENT (_MSC_VER >= 1912)
+
+#define _PSTL_CPP14_2RANGE_MISMATCH_EQUAL_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201300L || __cpp_lib_robust_nonmodifying_seq_ops == 201304)
+
+#define _PSTL_CPP14_MAKE_REVERSE_ITERATOR_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201402L || __cpp_lib_make_reverse_iterator == 201402)
+
+#define _PSTL_CPP14_INTEGER_SEQUENCE_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201402L)
+#define _PSTL_CPP14_VARIABLE_TEMPLATES_PRESENT (!__INTEL_COMPILER || __INTEL_COMPILER >= 1700) && (_MSC_FULL_VER >= 190023918 || __cplusplus >= 201402L)
+
+
+#define _PSTL_EARLYEXIT_PRESENT (__INTEL_COMPILER >= 1800)
+#define _PSTL_MONOTONIC_PRESENT (__INTEL_COMPILER >= 1800)
+
+
+#define _PSTL_UDR_PRESENT 1
+
+
+
+
+#define _PSTL_UDS_PRESENT (__INTEL_COMPILER >= 1900 && __INTEL_COMPILER_BUILD_DATE >= 20180626)
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_EARLYEXIT 
+
+
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_ORDERED_MONOTONIC(PRM) 
+#define _PSTL_PRAGMA_SIMD_ORDERED_MONOTONIC_2ARGS(PRM1,PRM2) 
+
+
+// Declaration of reduction functor, where
+// NAME - the name of the functor
+// OP - type of the callable object with the reduction operation
+// omp_in - refers to the local partial result
+// omp_out - refers to the final value of the combiner operator
+// omp_priv - refers to the private copy of the initial value
+// omp_orig - refers to the original variable to be reduced
+#define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME,OP) _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
+
+
+
+
+
+#define _PSTL_PRAGMA_VECTOR_UNALIGNED 
+
+
+// Check the user-defined macro to use non-temporal stores
+
+
+
+#define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED 
+
+
+
+
+
+#define _PSTL_PRAGMA_LOCATION " [Parallel STL message]: "
+
+
+#define _PSTL_PRAGMA_MESSAGE_IMPL(x) _PSTL_PRAGMA(message(_PSTL_STRING_CONCAT(_PSTL_PRAGMA_LOCATION, x)))
+
+
+
+
+
+#define _PSTL_PRAGMA_MESSAGE(x) 
+#define _PSTL_PRAGMA_MESSAGE_POLICIES(x) 
+
+
+// broken macros
+#define _PSTL_CPP11_STD_ROTATE_BROKEN ((__GLIBCXX__ && __GLIBCXX__ < 20150716) || (_MSC_VER && _MSC_VER < 1800))
+
+#define _PSTL_ICC_18_OMP_SIMD_BROKEN (__INTEL_COMPILER == 1800)
+
+# 779 "../x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h" 2 3
+
+
+
+// End of prewritten config; the settings discovered at configure time follow.
+/* config.h.  Generated from config.h.in by configure.  */
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the `acosf' function. */
+#define _GLIBCXX_HAVE_ACOSF 1
+
+/* Define to 1 if you have the `acosl' function. */
+#define _GLIBCXX_HAVE_ACOSL 1
+
+/* Define to 1 if you have the `aligned_alloc' function. */
+#define _GLIBCXX_HAVE_ALIGNED_ALLOC 1
+
+/* Define to 1 if you have the <arpa/inet.h> header file. */
+#define _GLIBCXX_HAVE_ARPA_INET_H 1
+
+/* Define to 1 if you have the `asinf' function. */
+#define _GLIBCXX_HAVE_ASINF 1
+
+/* Define to 1 if you have the `asinl' function. */
+#define _GLIBCXX_HAVE_ASINL 1
+
+/* Define to 1 if the target assembler supports .symver directive. */
+#define _GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE 1
+
+/* Define to 1 if you have the `atan2f' function. */
+#define _GLIBCXX_HAVE_ATAN2F 1
+
+/* Define to 1 if you have the `atan2l' function. */
+#define _GLIBCXX_HAVE_ATAN2L 1
+
+/* Define to 1 if you have the `atanf' function. */
+#define _GLIBCXX_HAVE_ATANF 1
+
+/* Define to 1 if you have the `atanl' function. */
+#define _GLIBCXX_HAVE_ATANL 1
+
+/* Defined if shared_ptr reference counting should use atomic operations. */
+#define _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY 1
+
+/* Define to 1 if you have the `at_quick_exit' function. */
+#define _GLIBCXX_HAVE_AT_QUICK_EXIT 1
+
+/* Define to 1 if the target assembler supports thread-local storage. */
+/* #undef _GLIBCXX_HAVE_CC_TLS */
+
+/* Define to 1 if you have the `ceilf' function. */
+#define _GLIBCXX_HAVE_CEILF 1
+
+/* Define to 1 if you have the `ceill' function. */
+#define _GLIBCXX_HAVE_CEILL 1
+
+/* Define to 1 if you have the <complex.h> header file. */
+#define _GLIBCXX_HAVE_COMPLEX_H 1
+
+/* Define to 1 if you have the `cosf' function. */
+#define _GLIBCXX_HAVE_COSF 1
+
+/* Define to 1 if you have the `coshf' function. */
+#define _GLIBCXX_HAVE_COSHF 1
+
+/* Define to 1 if you have the `coshl' function. */
+#define _GLIBCXX_HAVE_COSHL 1
+
+/* Define to 1 if you have the `cosl' function. */
+#define _GLIBCXX_HAVE_COSL 1
+
+/* Define to 1 if you have the <dirent.h> header file. */
+#define _GLIBCXX_HAVE_DIRENT_H 1
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#define _GLIBCXX_HAVE_DLFCN_H 1
+
+/* Define to 1 if you have the <endian.h> header file. */
+#define _GLIBCXX_HAVE_ENDIAN_H 1
+
+/* Define to 1 if GCC 4.6 supported std::exception_ptr for the target */
+#define _GLIBCXX_HAVE_EXCEPTION_PTR_SINCE_GCC46 1
+
+/* Define to 1 if you have the <execinfo.h> header file. */
+#define _GLIBCXX_HAVE_EXECINFO_H 1
+
+/* Define to 1 if you have the `expf' function. */
+#define _GLIBCXX_HAVE_EXPF 1
+
+/* Define to 1 if you have the `expl' function. */
+#define _GLIBCXX_HAVE_EXPL 1
+
+/* Define to 1 if you have the `fabsf' function. */
+#define _GLIBCXX_HAVE_FABSF 1
+
+/* Define to 1 if you have the `fabsl' function. */
+#define _GLIBCXX_HAVE_FABSL 1
+
+/* Define to 1 if you have the <fcntl.h> header file. */
+#define _GLIBCXX_HAVE_FCNTL_H 1
+
+/* Define to 1 if you have the <fenv.h> header file. */
+#define _GLIBCXX_HAVE_FENV_H 1
+
+/* Define to 1 if you have the `finite' function. */
+#define _GLIBCXX_HAVE_FINITE 1
+
+/* Define to 1 if you have the `finitef' function. */
+#define _GLIBCXX_HAVE_FINITEF 1
+
+/* Define to 1 if you have the `finitel' function. */
+#define _GLIBCXX_HAVE_FINITEL 1
+
+/* Define to 1 if you have the <float.h> header file. */
+#define _GLIBCXX_HAVE_FLOAT_H 1
+
+/* Define to 1 if you have the `floorf' function. */
+#define _GLIBCXX_HAVE_FLOORF 1
+
+/* Define to 1 if you have the `floorl' function. */
+#define _GLIBCXX_HAVE_FLOORL 1
+
+/* Define to 1 if you have the `fmodf' function. */
+#define _GLIBCXX_HAVE_FMODF 1
+
+/* Define to 1 if you have the `fmodl' function. */
+#define _GLIBCXX_HAVE_FMODL 1
+
+/* Define to 1 if you have the `fpclass' function. */
+/* #undef _GLIBCXX_HAVE_FPCLASS */
+
+/* Define to 1 if you have the <fp.h> header file. */
+/* #undef _GLIBCXX_HAVE_FP_H */
+
+/* Define to 1 if you have the `frexpf' function. */
+#define _GLIBCXX_HAVE_FREXPF 1
+
+/* Define to 1 if you have the `frexpl' function. */
+#define _GLIBCXX_HAVE_FREXPL 1
+
+/* Define if _Unwind_GetIPInfo is available. */
+#define _GLIBCXX_HAVE_GETIPINFO 1
+
+/* Define if gets is available in <stdio.h> before C++14. */
+#define _GLIBCXX_HAVE_GETS 1
+
+/* Define to 1 if you have the `hypot' function. */
+#define _GLIBCXX_HAVE_HYPOT 1
+
+/* Define to 1 if you have the `hypotf' function. */
+#define _GLIBCXX_HAVE_HYPOTF 1
+
+/* Define to 1 if you have the `hypotl' function. */
+#define _GLIBCXX_HAVE_HYPOTL 1
+
+/* Define if you have the iconv() function. */
+#define _GLIBCXX_HAVE_ICONV 1
+
+/* Define to 1 if you have the <ieeefp.h> header file. */
+/* #undef _GLIBCXX_HAVE_IEEEFP_H */
+
+/* Define if int64_t is available in <stdint.h>. */
+#define _GLIBCXX_HAVE_INT64_T 1
+
+/* Define if int64_t is a long. */
+#define _GLIBCXX_HAVE_INT64_T_LONG 1
+
+/* Define if int64_t is a long long. */
+/* #undef _GLIBCXX_HAVE_INT64_T_LONG_LONG */
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define _GLIBCXX_HAVE_INTTYPES_H 1
+
+/* Define to 1 if you have the `isinf' function. */
+/* #undef _GLIBCXX_HAVE_ISINF */
+
+/* Define to 1 if you have the `isinff' function. */
+#define _GLIBCXX_HAVE_ISINFF 1
+
+/* Define to 1 if you have the `isinfl' function. */
+#define _GLIBCXX_HAVE_ISINFL 1
+
+/* Define to 1 if you have the `isnan' function. */
+/* #undef _GLIBCXX_HAVE_ISNAN */
+
+/* Define to 1 if you have the `isnanf' function. */
+#define _GLIBCXX_HAVE_ISNANF 1
+
+/* Define to 1 if you have the `isnanl' function. */
+#define _GLIBCXX_HAVE_ISNANL 1
+
+/* Defined if iswblank exists. */
+#define _GLIBCXX_HAVE_ISWBLANK 1
+
+/* Define if LC_MESSAGES is available in <locale.h>. */
+#define _GLIBCXX_HAVE_LC_MESSAGES 1
+
+/* Define to 1 if you have the `ldexpf' function. */
+#define _GLIBCXX_HAVE_LDEXPF 1
+
+/* Define to 1 if you have the `ldexpl' function. */
+#define _GLIBCXX_HAVE_LDEXPL 1
+
+/* Define to 1 if you have the <libintl.h> header file. */
+#define _GLIBCXX_HAVE_LIBINTL_H 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_AS 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_DATA 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_FSIZE 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_RSS 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_VMEM 0
+
+/* Define if link is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_LINK 1
+
+/* Define if futex syscall is available. */
+#define _GLIBCXX_HAVE_LINUX_FUTEX 1
+
+/* Define to 1 if you have the <linux/random.h> header file. */
+#define _GLIBCXX_HAVE_LINUX_RANDOM_H 1
+
+/* Define to 1 if you have the <linux/types.h> header file. */
+#define _GLIBCXX_HAVE_LINUX_TYPES_H 1
+
+/* Define to 1 if you have the <locale.h> header file. */
+#define _GLIBCXX_HAVE_LOCALE_H 1
+
+/* Define to 1 if you have the `log10f' function. */
+#define _GLIBCXX_HAVE_LOG10F 1
+
+/* Define to 1 if you have the `log10l' function. */
+#define _GLIBCXX_HAVE_LOG10L 1
+
+/* Define to 1 if you have the `logf' function. */
+#define _GLIBCXX_HAVE_LOGF 1
+
+/* Define to 1 if you have the `logl' function. */
+#define _GLIBCXX_HAVE_LOGL 1
+
+/* Define to 1 if you have the <machine/endian.h> header file. */
+/* #undef _GLIBCXX_HAVE_MACHINE_ENDIAN_H */
+
+/* Define to 1 if you have the <machine/param.h> header file. */
+/* #undef _GLIBCXX_HAVE_MACHINE_PARAM_H */
+
+/* Define if mbstate_t exists in wchar.h. */
+#define _GLIBCXX_HAVE_MBSTATE_T 1
+
+/* Define to 1 if you have the `memalign' function. */
+#define _GLIBCXX_HAVE_MEMALIGN 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define _GLIBCXX_HAVE_MEMORY_H 1
+
+/* Define to 1 if you have the `modf' function. */
+#define _GLIBCXX_HAVE_MODF 1
+
+/* Define to 1 if you have the `modff' function. */
+#define _GLIBCXX_HAVE_MODFF 1
+
+/* Define to 1 if you have the `modfl' function. */
+#define _GLIBCXX_HAVE_MODFL 1
+
+/* Define to 1 if you have the <nan.h> header file. */
+/* #undef _GLIBCXX_HAVE_NAN_H */
+
+/* Define to 1 if you have the <netdb.h> header file. */
+#define _GLIBCXX_HAVE_NETDB_H 1
+
+/* Define to 1 if you have the <netinet/in.h> header file. */
+#define _GLIBCXX_HAVE_NETINET_IN_H 1
+
+/* Define to 1 if you have the <netinet/tcp.h> header file. */
+#define _GLIBCXX_HAVE_NETINET_TCP_H 1
+
+/* Define if <math.h> defines obsolete isinf function. */
+/* #undef _GLIBCXX_HAVE_OBSOLETE_ISINF */
+
+/* Define if <math.h> defines obsolete isnan function. */
+/* #undef _GLIBCXX_HAVE_OBSOLETE_ISNAN */
+
+/* Define if poll is available in <poll.h>. */
+#define _GLIBCXX_HAVE_POLL 1
+
+/* Define to 1 if you have the <poll.h> header file. */
+#define _GLIBCXX_HAVE_POLL_H 1
+
+/* Define to 1 if you have the `posix_memalign' function. */
+#define _GLIBCXX_HAVE_POSIX_MEMALIGN 1
+
+/* Define to 1 if you have the `powf' function. */
+#define _GLIBCXX_HAVE_POWF 1
+
+/* Define to 1 if you have the `powl' function. */
+#define _GLIBCXX_HAVE_POWL 1
+
+/* Define to 1 if you have the `qfpclass' function. */
+/* #undef _GLIBCXX_HAVE_QFPCLASS */
+
+/* Define to 1 if you have the `quick_exit' function. */
+#define _GLIBCXX_HAVE_QUICK_EXIT 1
+
+/* Define if readlink is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_READLINK 1
+
+/* Define to 1 if you have the `setenv' function. */
+#define _GLIBCXX_HAVE_SETENV 1
+
+/* Define to 1 if you have the `sincos' function. */
+#define _GLIBCXX_HAVE_SINCOS 1
+
+/* Define to 1 if you have the `sincosf' function. */
+#define _GLIBCXX_HAVE_SINCOSF 1
+
+/* Define to 1 if you have the `sincosl' function. */
+#define _GLIBCXX_HAVE_SINCOSL 1
+
+/* Define to 1 if you have the `sinf' function. */
+#define _GLIBCXX_HAVE_SINF 1
+
+/* Define to 1 if you have the `sinhf' function. */
+#define _GLIBCXX_HAVE_SINHF 1
+
+/* Define to 1 if you have the `sinhl' function. */
+#define _GLIBCXX_HAVE_SINHL 1
+
+/* Define to 1 if you have the `sinl' function. */
+#define _GLIBCXX_HAVE_SINL 1
+
+/* Defined if sleep exists. */
+/* #undef _GLIBCXX_HAVE_SLEEP */
+
+/* Define to 1 if you have the `sockatmark' function. */
+#define _GLIBCXX_HAVE_SOCKATMARK 1
+
+/* Define to 1 if you have the `sqrtf' function. */
+#define _GLIBCXX_HAVE_SQRTF 1
+
+/* Define to 1 if you have the `sqrtl' function. */
+#define _GLIBCXX_HAVE_SQRTL 1
+
+/* Define to 1 if you have the <stdalign.h> header file. */
+#define _GLIBCXX_HAVE_STDALIGN_H 1
+
+/* Define to 1 if you have the <stdbool.h> header file. */
+#define _GLIBCXX_HAVE_STDBOOL_H 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define _GLIBCXX_HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define _GLIBCXX_HAVE_STDLIB_H 1
+
+/* Define if strerror_l is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRERROR_L 1
+
+/* Define if strerror_r is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRERROR_R 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#define _GLIBCXX_HAVE_STRINGS_H 1
+
+/* Define to 1 if you have the <string.h> header file. */
+#define _GLIBCXX_HAVE_STRING_H 1
+
+/* Define to 1 if you have the `strtof' function. */
+#define _GLIBCXX_HAVE_STRTOF 1
+
+/* Define to 1 if you have the `strtold' function. */
+#define _GLIBCXX_HAVE_STRTOLD 1
+
+/* Define to 1 if `d_type' is a member of `struct dirent'. */
+#define _GLIBCXX_HAVE_STRUCT_DIRENT_D_TYPE 1
+
+/* Define if strxfrm_l is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRXFRM_L 1
+
+/* Define if symlink is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_SYMLINK 1
+
+/* Define to 1 if the target runtime linker supports binding the same symbol
+   to different versions. */
+#define _GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT 1
+
+/* Define to 1 if you have the <sys/filio.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_FILIO_H */
+
+/* Define to 1 if you have the <sys/ioctl.h> header file. */
+#define _GLIBCXX_HAVE_SYS_IOCTL_H 1
+
+/* Define to 1 if you have the <sys/ipc.h> header file. */
+#define _GLIBCXX_HAVE_SYS_IPC_H 1
+
+/* Define to 1 if you have the <sys/isa_defs.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_ISA_DEFS_H */
+
+/* Define to 1 if you have the <sys/machine.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_MACHINE_H */
+
+/* Define to 1 if you have the <sys/param.h> header file. */
+#define _GLIBCXX_HAVE_SYS_PARAM_H 1
+
+/* Define to 1 if you have the <sys/resource.h> header file. */
+#define _GLIBCXX_HAVE_SYS_RESOURCE_H 1
+
+/* Define to 1 if you have a suitable <sys/sdt.h> header file */
+#define _GLIBCXX_HAVE_SYS_SDT_H 1
+
+/* Define to 1 if you have the <sys/sem.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SEM_H 1
+
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SOCKET_H 1
+
+/* Define to 1 if you have the <sys/statvfs.h> header file. */
+#define _GLIBCXX_HAVE_SYS_STATVFS_H 1
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define _GLIBCXX_HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/sysinfo.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SYSINFO_H 1
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#define _GLIBCXX_HAVE_SYS_TIME_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define _GLIBCXX_HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if you have the <sys/uio.h> header file. */
+#define _GLIBCXX_HAVE_SYS_UIO_H 1
+
+/* Define if S_IFREG is available in <sys/stat.h>. */
+/* #undef _GLIBCXX_HAVE_S_IFREG */
+
+/* Define if S_ISREG is available in <sys/stat.h>. */
+#define _GLIBCXX_HAVE_S_ISREG 1
+
+/* Define to 1 if you have the `tanf' function. */
+#define _GLIBCXX_HAVE_TANF 1
+
+/* Define to 1 if you have the `tanhf' function. */
+#define _GLIBCXX_HAVE_TANHF 1
+
+/* Define to 1 if you have the `tanhl' function. */
+#define _GLIBCXX_HAVE_TANHL 1
+
+/* Define to 1 if you have the `tanl' function. */
+#define _GLIBCXX_HAVE_TANL 1
+
+/* Define to 1 if you have the <tgmath.h> header file. */
+#define _GLIBCXX_HAVE_TGMATH_H 1
+
+/* Define to 1 if you have the `timespec_get' function. */
+#define _GLIBCXX_HAVE_TIMESPEC_GET 1
+
+/* Define to 1 if the target supports thread-local storage. */
+#define _GLIBCXX_HAVE_TLS 1
+
+/* Define if truncate is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_TRUNCATE 1
+
+/* Define to 1 if you have the <uchar.h> header file. */
+#define _GLIBCXX_HAVE_UCHAR_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define _GLIBCXX_HAVE_UNISTD_H 1
+
+/* Define to 1 if you have the `uselocale' function. */
+#define _GLIBCXX_HAVE_USELOCALE 1
+
+/* Defined if usleep exists. */
+/* #undef _GLIBCXX_HAVE_USLEEP */
+
+/* Define to 1 if you have the <utime.h> header file. */
+#define _GLIBCXX_HAVE_UTIME_H 1
+
+/* Defined if vfwscanf exists. */
+#define _GLIBCXX_HAVE_VFWSCANF 1
+
+/* Defined if vswscanf exists. */
+#define _GLIBCXX_HAVE_VSWSCANF 1
+
+/* Defined if vwscanf exists. */
+#define _GLIBCXX_HAVE_VWSCANF 1
+
+/* Define to 1 if you have the <wchar.h> header file. */
+#define _GLIBCXX_HAVE_WCHAR_H 1
+
+/* Defined if wcstof exists. */
+#define _GLIBCXX_HAVE_WCSTOF 1
+
+/* Define to 1 if you have the <wctype.h> header file. */
+#define _GLIBCXX_HAVE_WCTYPE_H 1
+
+/* Defined if Sleep exists. */
+/* #undef _GLIBCXX_HAVE_WIN32_SLEEP */
+
+/* Define if writev is available in <sys/uio.h>. */
+#define _GLIBCXX_HAVE_WRITEV 1
+
+/* Define to 1 if you have the <xlocale.h> header file. */
+/* #undef _GLIBCXX_HAVE_XLOCALE_H */
+
+/* Define to 1 if you have the `_acosf' function. */
+/* #undef _GLIBCXX_HAVE__ACOSF */
+
+/* Define to 1 if you have the `_acosl' function. */
+/* #undef _GLIBCXX_HAVE__ACOSL */
+
+/* Define to 1 if you have the `_aligned_malloc' function. */
+/* #undef _GLIBCXX_HAVE__ALIGNED_MALLOC */
+
+/* Define to 1 if you have the `_asinf' function. */
+/* #undef _GLIBCXX_HAVE__ASINF */
+
+/* Define to 1 if you have the `_asinl' function. */
+/* #undef _GLIBCXX_HAVE__ASINL */
+
+/* Define to 1 if you have the `_atan2f' function. */
+/* #undef _GLIBCXX_HAVE__ATAN2F */
+
+/* Define to 1 if you have the `_atan2l' function. */
+/* #undef _GLIBCXX_HAVE__ATAN2L */
+
+/* Define to 1 if you have the `_atanf' function. */
+/* #undef _GLIBCXX_HAVE__ATANF */
+
+/* Define to 1 if you have the `_atanl' function. */
+/* #undef _GLIBCXX_HAVE__ATANL */
+
+/* Define to 1 if you have the `_ceilf' function. */
+/* #undef _GLIBCXX_HAVE__CEILF */
+
+/* Define to 1 if you have the `_ceill' function. */
+/* #undef _GLIBCXX_HAVE__CEILL */
+
+/* Define to 1 if you have the `_cosf' function. */
+/* #undef _GLIBCXX_HAVE__COSF */
+
+/* Define to 1 if you have the `_coshf' function. */
+/* #undef _GLIBCXX_HAVE__COSHF */
+
+/* Define to 1 if you have the `_coshl' function. */
+/* #undef _GLIBCXX_HAVE__COSHL */
+
+/* Define to 1 if you have the `_cosl' function. */
+/* #undef _GLIBCXX_HAVE__COSL */
+
+/* Define to 1 if you have the `_expf' function. */
+/* #undef _GLIBCXX_HAVE__EXPF */
+
+/* Define to 1 if you have the `_expl' function. */
+/* #undef _GLIBCXX_HAVE__EXPL */
+
+/* Define to 1 if you have the `_fabsf' function. */
+/* #undef _GLIBCXX_HAVE__FABSF */
+
+/* Define to 1 if you have the `_fabsl' function. */
+/* #undef _GLIBCXX_HAVE__FABSL */
+
+/* Define to 1 if you have the `_finite' function. */
+/* #undef _GLIBCXX_HAVE__FINITE */
+
+/* Define to 1 if you have the `_finitef' function. */
+/* #undef _GLIBCXX_HAVE__FINITEF */
+
+/* Define to 1 if you have the `_finitel' function. */
+/* #undef _GLIBCXX_HAVE__FINITEL */
+
+/* Define to 1 if you have the `_floorf' function. */
+/* #undef _GLIBCXX_HAVE__FLOORF */
+
+/* Define to 1 if you have the `_floorl' function. */
+/* #undef _GLIBCXX_HAVE__FLOORL */
+
+/* Define to 1 if you have the `_fmodf' function. */
+/* #undef _GLIBCXX_HAVE__FMODF */
+
+/* Define to 1 if you have the `_fmodl' function. */
+/* #undef _GLIBCXX_HAVE__FMODL */
+
+/* Define to 1 if you have the `_fpclass' function. */
+/* #undef _GLIBCXX_HAVE__FPCLASS */
+
+/* Define to 1 if you have the `_frexpf' function. */
+/* #undef _GLIBCXX_HAVE__FREXPF */
+
+/* Define to 1 if you have the `_frexpl' function. */
+/* #undef _GLIBCXX_HAVE__FREXPL */
+
+/* Define to 1 if you have the `_hypot' function. */
+/* #undef _GLIBCXX_HAVE__HYPOT */
+
+/* Define to 1 if you have the `_hypotf' function. */
+/* #undef _GLIBCXX_HAVE__HYPOTF */
+
+/* Define to 1 if you have the `_hypotl' function. */
+/* #undef _GLIBCXX_HAVE__HYPOTL */
+
+/* Define to 1 if you have the `_isinf' function. */
+/* #undef _GLIBCXX_HAVE__ISINF */
+
+/* Define to 1 if you have the `_isinff' function. */
+/* #undef _GLIBCXX_HAVE__ISINFF */
+
+/* Define to 1 if you have the `_isinfl' function. */
+/* #undef _GLIBCXX_HAVE__ISINFL */
+
+/* Define to 1 if you have the `_isnan' function. */
+/* #undef _GLIBCXX_HAVE__ISNAN */
+
+/* Define to 1 if you have the `_isnanf' function. */
+/* #undef _GLIBCXX_HAVE__ISNANF */
+
+/* Define to 1 if you have the `_isnanl' function. */
+/* #undef _GLIBCXX_HAVE__ISNANL */
+
+/* Define to 1 if you have the `_ldexpf' function. */
+/* #undef _GLIBCXX_HAVE__LDEXPF */
+
+/* Define to 1 if you have the `_ldexpl' function. */
+/* #undef _GLIBCXX_HAVE__LDEXPL */
+
+/* Define to 1 if you have the `_log10f' function. */
+/* #undef _GLIBCXX_HAVE__LOG10F */
+
+/* Define to 1 if you have the `_log10l' function. */
+/* #undef _GLIBCXX_HAVE__LOG10L */
+
+/* Define to 1 if you have the `_logf' function. */
+/* #undef _GLIBCXX_HAVE__LOGF */
+
+/* Define to 1 if you have the `_logl' function. */
+/* #undef _GLIBCXX_HAVE__LOGL */
+
+/* Define to 1 if you have the `_modf' function. */
+/* #undef _GLIBCXX_HAVE__MODF */
+
+/* Define to 1 if you have the `_modff' function. */
+/* #undef _GLIBCXX_HAVE__MODFF */
+
+/* Define to 1 if you have the `_modfl' function. */
+/* #undef _GLIBCXX_HAVE__MODFL */
+
+/* Define to 1 if you have the `_powf' function. */
+/* #undef _GLIBCXX_HAVE__POWF */
+
+/* Define to 1 if you have the `_powl' function. */
+/* #undef _GLIBCXX_HAVE__POWL */
+
+/* Define to 1 if you have the `_qfpclass' function. */
+/* #undef _GLIBCXX_HAVE__QFPCLASS */
+
+/* Define to 1 if you have the `_sincos' function. */
+/* #undef _GLIBCXX_HAVE__SINCOS */
+
+/* Define to 1 if you have the `_sincosf' function. */
+/* #undef _GLIBCXX_HAVE__SINCOSF */
+
+/* Define to 1 if you have the `_sincosl' function. */
+/* #undef _GLIBCXX_HAVE__SINCOSL */
+
+/* Define to 1 if you have the `_sinf' function. */
+/* #undef _GLIBCXX_HAVE__SINF */
+
+/* Define to 1 if you have the `_sinhf' function. */
+/* #undef _GLIBCXX_HAVE__SINHF */
+
+/* Define to 1 if you have the `_sinhl' function. */
+/* #undef _GLIBCXX_HAVE__SINHL */
+
+/* Define to 1 if you have the `_sinl' function. */
+/* #undef _GLIBCXX_HAVE__SINL */
+
+/* Define to 1 if you have the `_sqrtf' function. */
+/* #undef _GLIBCXX_HAVE__SQRTF */
+
+/* Define to 1 if you have the `_sqrtl' function. */
+/* #undef _GLIBCXX_HAVE__SQRTL */
+
+/* Define to 1 if you have the `_tanf' function. */
+/* #undef _GLIBCXX_HAVE__TANF */
+
+/* Define to 1 if you have the `_tanhf' function. */
+/* #undef _GLIBCXX_HAVE__TANHF */
+
+/* Define to 1 if you have the `_tanhl' function. */
+/* #undef _GLIBCXX_HAVE__TANHL */
+
+/* Define to 1 if you have the `_tanl' function. */
+/* #undef _GLIBCXX_HAVE__TANL */
+
+/* Define to 1 if you have the `_wfopen' function. */
+/* #undef _GLIBCXX_HAVE__WFOPEN */
+
+/* Define to 1 if you have the `__cxa_thread_atexit' function. */
+/* #undef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT */
+
+/* Define to 1 if you have the `__cxa_thread_atexit_impl' function. */
+#define _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL 1
+
+/* Define as const if the declaration of iconv() needs const. */
+#define _GLIBCXX_ICONV_CONST 
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#define LT_OBJDIR ".libs/"
+
+/* Defined if no way to sleep is available. */
+/* #undef NO_SLEEP */
+
+/* Name of package */
+/* #undef _GLIBCXX_PACKAGE */
+
+/* Define to the address where bug reports for this package should be sent. */
+#define _GLIBCXX_PACKAGE_BUGREPORT ""
+
+/* Define to the full name of this package. */
+#define _GLIBCXX_PACKAGE_NAME "package-unused"
+
+/* Define to the full name and version of this package. */
+#define _GLIBCXX_PACKAGE_STRING "package-unused version-unused"
+
+/* Define to the one symbol short name of this package. */
+#define _GLIBCXX_PACKAGE_TARNAME "libstdc++"
+
+/* Define to the home page for this package. */
+#define _GLIBCXX_PACKAGE_URL ""
+
+/* Define to the version of this package. */
+#define _GLIBCXX_PACKAGE__GLIBCXX_VERSION "version-unused"
+
+/* The size of `char', as computed by sizeof. */
+/* #undef SIZEOF_CHAR */
+
+/* The size of `int', as computed by sizeof. */
+/* #undef SIZEOF_INT */
+
+/* The size of `long', as computed by sizeof. */
+/* #undef SIZEOF_LONG */
+
+/* The size of `short', as computed by sizeof. */
+/* #undef SIZEOF_SHORT */
+
+/* The size of `void *', as computed by sizeof. */
+/* #undef SIZEOF_VOID_P */
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* Version number of package */
+/* #undef _GLIBCXX_VERSION */
+
+/* Enable large inode numbers on Mac OS X 10.5.  */
+
+#define _GLIBCXX_DARWIN_USE_64_BIT_INODE 1
+
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+/* #undef _GLIBCXX_FILE_OFFSET_BITS */
+
+/* Define if C99 functions in <complex.h> should be used in <complex> for
+   C++11. Using compiler builtins for these functions requires corresponding
+   C99 library functions to be present. */
+#define _GLIBCXX11_USE_C99_COMPLEX 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in <cmath>
+   in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_MATH 1
+
+/* Define if C99 functions or macros in <stdio.h> should be imported in
+   <cstdio> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_STDIO 1
+
+/* Define if C99 functions or macros in <stdlib.h> should be imported in
+   <cstdlib> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_STDLIB 1
+
+/* Define if C99 functions or macros in <wchar.h> should be imported in
+   <cwchar> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_WCHAR 1
+
+/* Define if C99 functions in <complex.h> should be used in <complex> for
+   C++98. Using compiler builtins for these functions requires corresponding
+   C99 library functions to be present. */
+#define _GLIBCXX98_USE_C99_COMPLEX 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in <cmath>
+   in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_MATH 1
+
+/* Define if C99 functions or macros in <stdio.h> should be imported in
+   <cstdio> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_STDIO 1
+
+/* Define if C99 functions or macros in <stdlib.h> should be imported in
+   <cstdlib> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_STDLIB 1
+
+/* Define if C99 functions or macros in <wchar.h> should be imported in
+   <cwchar> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_WCHAR 1
+
+/* Define if the compiler supports C++11 atomics. */
+#define _GLIBCXX_ATOMIC_BUILTINS 1
+
+/* Define to use concept checking code from the boost libraries. */
+/* #undef _GLIBCXX_CONCEPT_CHECKS */
+
+/* Define to 1 if a fully dynamic basic_string is wanted, 0 to disable,
+   undefined for platform defaults */
+#define _GLIBCXX_FULLY_DYNAMIC_STRING 0
+
+/* Define if gthreads library is available. */
+#define _GLIBCXX_HAS_GTHREADS 1
+
+/* Define to 1 if POSIX Semaphores with sem_timedwait are available in
+   <semaphore.h>. */
+#define _GLIBCXX__GLIBCXX_HAVE_POSIX_SEMAPHORE 1
+
+/* Define to 1 if a full hosted library is built, or 0 if freestanding. */
+#define _GLIBCXX_HOSTED 1
+
+/* Define if compatibility should be provided for alternative 128-bit long
+   double formats. */
+
+/* Define if compatibility should be provided for -mlong-double-64. */
+
+/* Define to the letter to which size_t is mangled. */
+#define _GLIBCXX_MANGLE_SIZE_T m
+
+/* Define if C99 llrint and llround functions are missing from <math.h>. */
+/* #undef _GLIBCXX_NO_C99_ROUNDING_FUNCS */
+
+/* Define if ptrdiff_t is int. */
+/* #undef _GLIBCXX_PTRDIFF_T_IS_INT */
+
+/* Define if using setrlimit to set resource limits during "make check" */
+#define _GLIBCXX_RES_LIMITS 1
+
+/* Define if size_t is unsigned int. */
+/* #undef _GLIBCXX_SIZE_T_IS_UINT */
+
+/* Define to the value of the EOF integer constant. */
+#define _GLIBCXX_STDIO_EOF -1
+
+/* Define to the value of the SEEK_CUR integer constant. */
+#define _GLIBCXX_STDIO_SEEK_CUR 1
+
+/* Define to the value of the SEEK_END integer constant. */
+#define _GLIBCXX_STDIO_SEEK_END 2
+
+/* Define to use symbol versioning in the shared library. */
+#define _GLIBCXX_SYMVER 1
+
+/* Define to use darwin versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_DARWIN */
+
+/* Define to use GNU versioning in the shared library. */
+#define _GLIBCXX_SYMVER_GNU 1
+
+/* Define to use GNU namespace versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_GNU_NAMESPACE */
+
+/* Define to use Sun versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_SUN */
+
+/* Define if C11 functions in <uchar.h> should be imported into namespace std
+   in <cuchar>. */
+#define _GLIBCXX_USE_C11_UCHAR_CXX11 1
+
+/* Define if C99 functions or macros from <wchar.h>, <math.h>, <complex.h>,
+   <stdio.h>, and <stdlib.h> can be used or exposed. */
+#define _GLIBCXX_USE_C99 1
+
+/* Define if C99 functions in <complex.h> should be used in <tr1/complex>.
+   Using compiler builtins for these functions requires corresponding C99
+   library functions to be present. */
+#define _GLIBCXX_USE_C99_COMPLEX_TR1 1
+
+/* Define if C99 functions in <ctype.h> should be imported in <tr1/cctype> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_CTYPE_TR1 1
+
+/* Define if C99 functions in <fenv.h> should be imported in <tr1/cfenv> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_FENV_TR1 1
+
+/* Define if C99 functions in <inttypes.h> should be imported in
+   <tr1/cinttypes> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_INTTYPES_TR1 1
+
+/* Define if wchar_t C99 functions in <inttypes.h> should be imported in
+   <tr1/cinttypes> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in
+   <tr1/cmath> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_MATH_TR1 1
+
+/* Define if C99 types in <stdint.h> should be imported in <tr1/cstdint> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_STDINT_TR1 1
+
+/* Defined if clock_gettime syscall has monotonic and realtime clock support.
+   */
+/* #undef _GLIBCXX_USE_CLOCK_GETTIME_SYSCALL */
+
+/* Defined if clock_gettime has monotonic clock support. */
+#define _GLIBCXX_USE_CLOCK_MONOTONIC 1
+
+/* Defined if clock_gettime has realtime clock support. */
+#define _GLIBCXX_USE_CLOCK_REALTIME 1
+
+/* Define if ISO/IEC TR 24733 decimal floating point types are supported on
+   this host. */
+#define _GLIBCXX_USE_DECIMAL_FLOAT 1
+
+/* Define if /dev/random and /dev/urandom are available for
+   std::random_device. */
+#define _GLIBCXX_USE_DEV_RANDOM 1
+
+/* Define if fchmod is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_FCHMOD 1
+
+/* Define if fchmodat is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_FCHMODAT 1
+
+/* Defined if gettimeofday is available. */
+#define _GLIBCXX_USE_GETTIMEOFDAY 1
+
+/* Define if get_nprocs is available in <sys/sysinfo.h>. */
+#define _GLIBCXX_USE_GET_NPROCS 1
+
+/* Define if __int128 is supported on this host. */
+#define _GLIBCXX_USE_INT128 1
+
+/* Define if LFS support is available. */
+#define _GLIBCXX_USE_LFS 1
+
+/* Define if code specialized for long long should be used. */
+#define _GLIBCXX_USE_LONG_LONG 1
+
+/* Define if lstat is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_LSTAT 1
+
+/* Defined if nanosleep is available. */
+#define _GLIBCXX_USE_NANOSLEEP 1
+
+/* Define if NLS translations are to be used. */
+#define _GLIBCXX_USE_NLS 1
+
+/* Define if pthreads_num_processors_np is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP */
+
+/* Define if pthread_cond_clockwait is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT */
+
+/* Define if pthread_mutex_clocklock is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK */
+
+/* Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are
+   available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK */
+
+/* Define if POSIX read/write locks are available in <gthr.h>. */
+#define _GLIBCXX_USE_PTHREAD_RWLOCK_T 1
+
+/* Define if /dev/random and /dev/urandom are available for the random_device
+   of TR1 (Chapter 5.1). */
+#define _GLIBCXX_USE_RANDOM_TR1 1
+
+/* Define if usable realpath is available in <stdlib.h>. */
+#define _GLIBCXX_USE_REALPATH 1
+
+/* Defined if sched_yield is available. */
+#define _GLIBCXX_USE_SCHED_YIELD 1
+
+/* Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>. */
+#define _GLIBCXX_USE_SC_NPROCESSORS_ONLN 1
+
+/* Define if _SC_NPROC_ONLN is available in <unistd.h>. */
+/* #undef _GLIBCXX_USE_SC_NPROC_ONLN */
+
+/* Define if sendfile is available in <sys/sendfile.h>. */
+#define _GLIBCXX_USE_SENDFILE 1
+
+/* Define to restrict std::__basic_file<> to stdio APIs. */
+/* #undef _GLIBCXX_USE_STDIO_PURE */
+
+/* Define if struct stat has timespec members. */
+#define _GLIBCXX_USE_ST_MTIM 1
+
+/* Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>. */
+/* #undef _GLIBCXX_USE_SYSCTL_HW_NCPU */
+
+/* Define if obsolescent tmpnam is available in <stdio.h>. */
+#define _GLIBCXX_USE_TMPNAM 1
+
+/* Define if utime is available in <utime.h>. */
+#define _GLIBCXX_USE_UTIME 1
+
+/* Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and
+   AT_FDCWD in <fcntl.h>. */
+#define _GLIBCXX_USE_UTIMENSAT 1
+
+/* Define if code specialized for wchar_t should be used. */
+#define _GLIBCXX_USE_WCHAR_T 1
+
+/* Define to 1 if a verbose library is built, or 0 otherwise. */
+#define _GLIBCXX_VERBOSE 1
+
+/* Defined if as can handle rdrand. */
+#define _GLIBCXX_X86_RDRAND 1
+
+/* Defined if as can handle rdseed. */
+#define _GLIBCXX_X86_RDSEED 1
+
+/* Define to 1 if mutex_timedlock is available. */
+#define _GTHREAD_USE_MUTEX_TIMEDLOCK 1
+
+/* Define for large files, on AIX-style hosts. */
+/* #undef _GLIBCXX_LARGE_FILES */
+
+/* Define if all C++11 floating point overloads are available in <math.h>.  */
+
+/* #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP */
+
+
+/* Define if all C++11 integral type overloads are available in <math.h>.  */
+
+/* #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT */
+
+
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+
+# 42 "../../..//src/libstdc++-v3/libsupc++/initializer_list" 2 3
+
+namespace std
+{
+  /// initializer_list
+  template<class _E>
+    class initializer_list
+    {
+    public:
+      typedef _E 		value_type;
+      typedef const _E& 	reference;
+      typedef const _E& 	const_reference;
+      typedef size_t 		size_type;
+      typedef const _E* 	iterator;
+      typedef const _E* 	const_iterator;
+
+    private:
+      iterator			_M_array;
+      size_type			_M_len;
+
+      // The compiler can call a private constructor.
+      constexpr initializer_list(const_iterator __a, size_type __l)
+      : _M_array(__a), _M_len(__l) { }
+
+    public:
+      constexpr initializer_list() noexcept
+      : _M_array(0), _M_len(0) { }
+
+      // Number of elements.
+      constexpr size_type
+      size() const noexcept { return _M_len; }
+
+      // First element.
+      constexpr const_iterator
+      begin() const noexcept { return _M_array; }
+
+      // One past the last element.
+      constexpr const_iterator
+      end() const noexcept { return begin() + size(); }
+    };
+
+  /**
+   *  @brief  Return an iterator pointing to the first element of
+   *          the initializer_list.
+   *  @param  __ils  Initializer list.
+   *  @relates initializer_list
+   */
+  template<class _Tp>
+    constexpr const _Tp*
+    begin(initializer_list<_Tp> __ils) noexcept
+    { return __ils.begin(); }
+
+  /**
+   *  @brief  Return an iterator pointing to one past the last element
+   *          of the initializer_list.
+   *  @param  __ils  Initializer list.
+   *  @relates initializer_list
+   */
+  template<class _Tp>
+    constexpr const _Tp*
+    end(initializer_list<_Tp> __ils) noexcept
+    { return __ils.end(); }
+}
+
+#pragma GCC visibility pop
+
+
+
diff --git a/gcc/testsuite/g++.dg/modules/pr99023_b.H b/gcc/testsuite/g++.dg/modules/pr99023_b.H
new file mode 100644
index 00000000000..71ac5c22763
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr99023_b.H
@@ -0,0 +1,22665 @@
+# 0 "pr99023_b.H"
+// PR c++/99023, ICE
+// { dg-additional-options {-std=c++17 -Wno-pedantic -fmodule-header -fpreprocessed -fdirectives-only --param ggc-min-expand=0} }
+// { dg-module-cmi {,/pr99023_b.H} }
+# 0 "<built-in>"
+#define __STDC__ 1
+#define __cplusplus 201703L
+#define __STDC_UTF_16__ 1
+#define __STDC_UTF_32__ 1
+#define __STDC_HOSTED__ 1
+#define __GNUC__ 11
+#define __GNUC_MINOR__ 0
+#define __GNUC_PATCHLEVEL__ 0
+#define __VERSION__ "11.0.0 20210217 (experimental)"
+#define __ATOMIC_RELAXED 0
+#define __ATOMIC_SEQ_CST 5
+#define __ATOMIC_ACQUIRE 2
+#define __ATOMIC_RELEASE 3
+#define __ATOMIC_ACQ_REL 4
+#define __ATOMIC_CONSUME 1
+#define __FINITE_MATH_ONLY__ 0
+#define _LP64 1
+#define __LP64__ 1
+#define __SIZEOF_INT__ 4
+#define __SIZEOF_LONG__ 8
+#define __SIZEOF_LONG_LONG__ 8
+#define __SIZEOF_SHORT__ 2
+#define __SIZEOF_FLOAT__ 4
+#define __SIZEOF_DOUBLE__ 8
+#define __SIZEOF_LONG_DOUBLE__ 16
+#define __SIZEOF_SIZE_T__ 8
+#define __CHAR_BIT__ 8
+#define __BIGGEST_ALIGNMENT__ 16
+#define __ORDER_LITTLE_ENDIAN__ 1234
+#define __ORDER_BIG_ENDIAN__ 4321
+#define __ORDER_PDP_ENDIAN__ 3412
+#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
+#define __SIZEOF_POINTER__ 8
+#define __GNUC_EXECUTION_CHARSET_NAME "UTF-8"
+#define __GNUC_WIDE_EXECUTION_CHARSET_NAME "UTF-32LE"
+#define __GNUG__ 11
+#define __SIZE_TYPE__ long unsigned int
+#define __PTRDIFF_TYPE__ long int
+#define __WCHAR_TYPE__ int
+#define __WINT_TYPE__ unsigned int
+#define __INTMAX_TYPE__ long int
+#define __UINTMAX_TYPE__ long unsigned int
+#define __CHAR16_TYPE__ short unsigned int
+#define __CHAR32_TYPE__ unsigned int
+#define __SIG_ATOMIC_TYPE__ int
+#define __INT8_TYPE__ signed char
+#define __INT16_TYPE__ short int
+#define __INT32_TYPE__ int
+#define __INT64_TYPE__ long int
+#define __UINT8_TYPE__ unsigned char
+#define __UINT16_TYPE__ short unsigned int
+#define __UINT32_TYPE__ unsigned int
+#define __UINT64_TYPE__ long unsigned int
+#define __INT_LEAST8_TYPE__ signed char
+#define __INT_LEAST16_TYPE__ short int
+#define __INT_LEAST32_TYPE__ int
+#define __INT_LEAST64_TYPE__ long int
+#define __UINT_LEAST8_TYPE__ unsigned char
+#define __UINT_LEAST16_TYPE__ short unsigned int
+#define __UINT_LEAST32_TYPE__ unsigned int
+#define __UINT_LEAST64_TYPE__ long unsigned int
+#define __INT_FAST8_TYPE__ signed char
+#define __INT_FAST16_TYPE__ long int
+#define __INT_FAST32_TYPE__ long int
+#define __INT_FAST64_TYPE__ long int
+#define __UINT_FAST8_TYPE__ unsigned char
+#define __UINT_FAST16_TYPE__ long unsigned int
+#define __UINT_FAST32_TYPE__ long unsigned int
+#define __UINT_FAST64_TYPE__ long unsigned int
+#define __INTPTR_TYPE__ long int
+#define __UINTPTR_TYPE__ long unsigned int
+#define __GXX_WEAK__ 1
+#define __DEPRECATED 1
+#define __GXX_RTTI 1
+#define __cpp_rtti 199711L
+#define __GXX_EXPERIMENTAL_CXX0X__ 1
+#define __cpp_binary_literals 201304L
+#define __cpp_hex_float 201603L
+#define __cpp_runtime_arrays 198712L
+#define __cpp_raw_strings 200710L
+#define __cpp_unicode_literals 200710L
+#define __cpp_user_defined_literals 200809L
+#define __cpp_lambdas 200907L
+#define __cpp_decltype 200707L
+#define __cpp_attributes 200809L
+#define __cpp_rvalue_reference 200610L
+#define __cpp_rvalue_references 200610L
+#define __cpp_variadic_templates 200704L
+#define __cpp_initializer_lists 200806L
+#define __cpp_delegating_constructors 200604L
+#define __cpp_nsdmi 200809L
+#define __cpp_inheriting_constructors 201511L
+#define __cpp_ref_qualifiers 200710L
+#define __cpp_alias_templates 200704L
+#define __cpp_return_type_deduction 201304L
+#define __cpp_init_captures 201304L
+#define __cpp_generic_lambdas 201304L
+#define __cpp_decltype_auto 201304L
+#define __cpp_aggregate_nsdmi 201304L
+#define __cpp_variable_templates 201304L
+#define __cpp_digit_separators 201309L
+#define __cpp_unicode_characters 201411L
+#define __cpp_static_assert 201411L
+#define __cpp_namespace_attributes 201411L
+#define __cpp_enumerator_attributes 201411L
+#define __cpp_nested_namespace_definitions 201411L
+#define __cpp_fold_expressions 201603L
+#define __cpp_nontype_template_args 201411L
+#define __cpp_range_based_for 201603L
+#define __cpp_constexpr 201603L
+#define __cpp_if_constexpr 201606L
+#define __cpp_capture_star_this 201603L
+#define __cpp_inline_variables 201606L
+#define __cpp_aggregate_bases 201603L
+#define __cpp_deduction_guides 201703L
+#define __cpp_noexcept_function_type 201510L
+#define __cpp_template_auto 201606L
+#define __cpp_structured_bindings 201606L
+#define __cpp_variadic_using 201611L
+#define __cpp_guaranteed_copy_elision 201606L
+#define __cpp_nontype_template_parameter_auto 201606L
+#define __cpp_modules 201810L
+#define __cpp_sized_deallocation 201309L
+#define __cpp_aligned_new 201606L
+#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16
+#define __cpp_template_template_args 201611L
+#define __cpp_threadsafe_static_init 200806L
+#define __STDCPP_THREADS__ 1
+#define __EXCEPTIONS 1
+#define __cpp_exceptions 199711L
+#define __GXX_ABI_VERSION 1015
+#define __SCHAR_MAX__ 0x7f
+#define __SHRT_MAX__ 0x7fff
+#define __INT_MAX__ 0x7fffffff
+#define __LONG_MAX__ 0x7fffffffffffffffL
+#define __LONG_LONG_MAX__ 0x7fffffffffffffffLL
+#define __WCHAR_MAX__ 0x7fffffff
+#define __WCHAR_MIN__ (-__WCHAR_MAX__ - 1)
+#define __WINT_MAX__ 0xffffffffU
+#define __WINT_MIN__ 0U
+#define __PTRDIFF_MAX__ 0x7fffffffffffffffL
+#define __SIZE_MAX__ 0xffffffffffffffffUL
+#define __SCHAR_WIDTH__ 8
+#define __SHRT_WIDTH__ 16
+#define __INT_WIDTH__ 32
+#define __LONG_WIDTH__ 64
+#define __LONG_LONG_WIDTH__ 64
+#define __WCHAR_WIDTH__ 32
+#define __WINT_WIDTH__ 32
+#define __PTRDIFF_WIDTH__ 64
+#define __SIZE_WIDTH__ 64
+#define __INTMAX_MAX__ 0x7fffffffffffffffL
+#define __INTMAX_C(c) c ## L
+#define __UINTMAX_MAX__ 0xffffffffffffffffUL
+#define __UINTMAX_C(c) c ## UL
+#define __INTMAX_WIDTH__ 64
+#define __SIG_ATOMIC_MAX__ 0x7fffffff
+#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1)
+#define __SIG_ATOMIC_WIDTH__ 32
+#define __INT8_MAX__ 0x7f
+#define __INT16_MAX__ 0x7fff
+#define __INT32_MAX__ 0x7fffffff
+#define __INT64_MAX__ 0x7fffffffffffffffL
+#define __UINT8_MAX__ 0xff
+#define __UINT16_MAX__ 0xffff
+#define __UINT32_MAX__ 0xffffffffU
+#define __UINT64_MAX__ 0xffffffffffffffffUL
+#define __INT_LEAST8_MAX__ 0x7f
+#define __INT8_C(c) c
+#define __INT_LEAST8_WIDTH__ 8
+#define __INT_LEAST16_MAX__ 0x7fff
+#define __INT16_C(c) c
+#define __INT_LEAST16_WIDTH__ 16
+#define __INT_LEAST32_MAX__ 0x7fffffff
+#define __INT32_C(c) c
+#define __INT_LEAST32_WIDTH__ 32
+#define __INT_LEAST64_MAX__ 0x7fffffffffffffffL
+#define __INT64_C(c) c ## L
+#define __INT_LEAST64_WIDTH__ 64
+#define __UINT_LEAST8_MAX__ 0xff
+#define __UINT8_C(c) c
+#define __UINT_LEAST16_MAX__ 0xffff
+#define __UINT16_C(c) c
+#define __UINT_LEAST32_MAX__ 0xffffffffU
+#define __UINT32_C(c) c ## U
+#define __UINT_LEAST64_MAX__ 0xffffffffffffffffUL
+#define __UINT64_C(c) c ## UL
+#define __INT_FAST8_MAX__ 0x7f
+#define __INT_FAST8_WIDTH__ 8
+#define __INT_FAST16_MAX__ 0x7fffffffffffffffL
+#define __INT_FAST16_WIDTH__ 64
+#define __INT_FAST32_MAX__ 0x7fffffffffffffffL
+#define __INT_FAST32_WIDTH__ 64
+#define __INT_FAST64_MAX__ 0x7fffffffffffffffL
+#define __INT_FAST64_WIDTH__ 64
+#define __UINT_FAST8_MAX__ 0xff
+#define __UINT_FAST16_MAX__ 0xffffffffffffffffUL
+#define __UINT_FAST32_MAX__ 0xffffffffffffffffUL
+#define __UINT_FAST64_MAX__ 0xffffffffffffffffUL
+#define __INTPTR_MAX__ 0x7fffffffffffffffL
+#define __INTPTR_WIDTH__ 64
+#define __UINTPTR_MAX__ 0xffffffffffffffffUL
+#define __GCC_IEC_559 2
+#define __GCC_IEC_559_COMPLEX 2
+#define __FLT_EVAL_METHOD__ 0
+#define __FLT_EVAL_METHOD_TS_18661_3__ 0
+#define __DEC_EVAL_METHOD__ 2
+#define __FLT_RADIX__ 2
+#define __FLT_MANT_DIG__ 24
+#define __FLT_DIG__ 6
+#define __FLT_MIN_EXP__ (-125)
+#define __FLT_MIN_10_EXP__ (-37)
+#define __FLT_MAX_EXP__ 128
+#define __FLT_MAX_10_EXP__ 38
+#define __FLT_DECIMAL_DIG__ 9
+#define __FLT_MAX__ 3.40282346638528859811704183484516925e+38F
+#define __FLT_NORM_MAX__ 3.40282346638528859811704183484516925e+38F
+#define __FLT_MIN__ 1.17549435082228750796873653722224568e-38F
+#define __FLT_EPSILON__ 1.19209289550781250000000000000000000e-7F
+#define __FLT_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F
+#define __FLT_HAS_DENORM__ 1
+#define __FLT_HAS_INFINITY__ 1
+#define __FLT_HAS_QUIET_NAN__ 1
+#define __FLT_IS_IEC_60559__ 2
+#define __DBL_MANT_DIG__ 53
+#define __DBL_DIG__ 15
+#define __DBL_MIN_EXP__ (-1021)
+#define __DBL_MIN_10_EXP__ (-307)
+#define __DBL_MAX_EXP__ 1024
+#define __DBL_MAX_10_EXP__ 308
+#define __DBL_DECIMAL_DIG__ 17
+#define __DBL_MAX__ double(1.79769313486231570814527423731704357e+308L)
+#define __DBL_NORM_MAX__ double(1.79769313486231570814527423731704357e+308L)
+#define __DBL_MIN__ double(2.22507385850720138309023271733240406e-308L)
+#define __DBL_EPSILON__ double(2.22044604925031308084726333618164062e-16L)
+#define __DBL_DENORM_MIN__ double(4.94065645841246544176568792868221372e-324L)
+#define __DBL_HAS_DENORM__ 1
+#define __DBL_HAS_INFINITY__ 1
+#define __DBL_HAS_QUIET_NAN__ 1
+#define __DBL_IS_IEC_60559__ 2
+#define __LDBL_MANT_DIG__ 64
+#define __LDBL_DIG__ 18
+#define __LDBL_MIN_EXP__ (-16381)
+#define __LDBL_MIN_10_EXP__ (-4931)
+#define __LDBL_MAX_EXP__ 16384
+#define __LDBL_MAX_10_EXP__ 4932
+#define __DECIMAL_DIG__ 21
+#define __LDBL_DECIMAL_DIG__ 21
+#define __LDBL_MAX__ 1.18973149535723176502126385303097021e+4932L
+#define __LDBL_NORM_MAX__ 1.18973149535723176502126385303097021e+4932L
+#define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
+#define __LDBL_EPSILON__ 1.08420217248550443400745280086994171e-19L
+#define __LDBL_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951L
+#define __LDBL_HAS_DENORM__ 1
+#define __LDBL_HAS_INFINITY__ 1
+#define __LDBL_HAS_QUIET_NAN__ 1
+#define __LDBL_IS_IEC_60559__ 2
+#define __FLT32_MANT_DIG__ 24
+#define __FLT32_DIG__ 6
+#define __FLT32_MIN_EXP__ (-125)
+#define __FLT32_MIN_10_EXP__ (-37)
+#define __FLT32_MAX_EXP__ 128
+#define __FLT32_MAX_10_EXP__ 38
+#define __FLT32_DECIMAL_DIG__ 9
+#define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
+#define __FLT32_NORM_MAX__ 3.40282346638528859811704183484516925e+38F32
+#define __FLT32_MIN__ 1.17549435082228750796873653722224568e-38F32
+#define __FLT32_EPSILON__ 1.19209289550781250000000000000000000e-7F32
+#define __FLT32_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F32
+#define __FLT32_HAS_DENORM__ 1
+#define __FLT32_HAS_INFINITY__ 1
+#define __FLT32_HAS_QUIET_NAN__ 1
+#define __FLT32_IS_IEC_60559__ 2
+#define __FLT64_MANT_DIG__ 53
+#define __FLT64_DIG__ 15
+#define __FLT64_MIN_EXP__ (-1021)
+#define __FLT64_MIN_10_EXP__ (-307)
+#define __FLT64_MAX_EXP__ 1024
+#define __FLT64_MAX_10_EXP__ 308
+#define __FLT64_DECIMAL_DIG__ 17
+#define __FLT64_MAX__ 1.79769313486231570814527423731704357e+308F64
+#define __FLT64_NORM_MAX__ 1.79769313486231570814527423731704357e+308F64
+#define __FLT64_MIN__ 2.22507385850720138309023271733240406e-308F64
+#define __FLT64_EPSILON__ 2.22044604925031308084726333618164062e-16F64
+#define __FLT64_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F64
+#define __FLT64_HAS_DENORM__ 1
+#define __FLT64_HAS_INFINITY__ 1
+#define __FLT64_HAS_QUIET_NAN__ 1
+#define __FLT64_IS_IEC_60559__ 2
+#define __FLT128_MANT_DIG__ 113
+#define __FLT128_DIG__ 33
+#define __FLT128_MIN_EXP__ (-16381)
+#define __FLT128_MIN_10_EXP__ (-4931)
+#define __FLT128_MAX_EXP__ 16384
+#define __FLT128_MAX_10_EXP__ 4932
+#define __FLT128_DECIMAL_DIG__ 36
+#define __FLT128_MAX__ 1.18973149535723176508575932662800702e+4932F128
+#define __FLT128_NORM_MAX__ 1.18973149535723176508575932662800702e+4932F128
+#define __FLT128_MIN__ 3.36210314311209350626267781732175260e-4932F128
+#define __FLT128_EPSILON__ 1.92592994438723585305597794258492732e-34F128
+#define __FLT128_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966F128
+#define __FLT128_HAS_DENORM__ 1
+#define __FLT128_HAS_INFINITY__ 1
+#define __FLT128_HAS_QUIET_NAN__ 1
+#define __FLT128_IS_IEC_60559__ 2
+#define __FLT32X_MANT_DIG__ 53
+#define __FLT32X_DIG__ 15
+#define __FLT32X_MIN_EXP__ (-1021)
+#define __FLT32X_MIN_10_EXP__ (-307)
+#define __FLT32X_MAX_EXP__ 1024
+#define __FLT32X_MAX_10_EXP__ 308
+#define __FLT32X_DECIMAL_DIG__ 17
+#define __FLT32X_MAX__ 1.79769313486231570814527423731704357e+308F32x
+#define __FLT32X_NORM_MAX__ 1.79769313486231570814527423731704357e+308F32x
+#define __FLT32X_MIN__ 2.22507385850720138309023271733240406e-308F32x
+#define __FLT32X_EPSILON__ 2.22044604925031308084726333618164062e-16F32x
+#define __FLT32X_DENORM_MIN__ 4.94065645841246544176568792868221372e-324F32x
+#define __FLT32X_HAS_DENORM__ 1
+#define __FLT32X_HAS_INFINITY__ 1
+#define __FLT32X_HAS_QUIET_NAN__ 1
+#define __FLT32X_IS_IEC_60559__ 2
+#define __FLT64X_MANT_DIG__ 64
+#define __FLT64X_DIG__ 18
+#define __FLT64X_MIN_EXP__ (-16381)
+#define __FLT64X_MIN_10_EXP__ (-4931)
+#define __FLT64X_MAX_EXP__ 16384
+#define __FLT64X_MAX_10_EXP__ 4932
+#define __FLT64X_DECIMAL_DIG__ 21
+#define __FLT64X_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+#define __FLT64X_NORM_MAX__ 1.18973149535723176502126385303097021e+4932F64x
+#define __FLT64X_MIN__ 3.36210314311209350626267781732175260e-4932F64x
+#define __FLT64X_EPSILON__ 1.08420217248550443400745280086994171e-19F64x
+#define __FLT64X_DENORM_MIN__ 3.64519953188247460252840593361941982e-4951F64x
+#define __FLT64X_HAS_DENORM__ 1
+#define __FLT64X_HAS_INFINITY__ 1
+#define __FLT64X_HAS_QUIET_NAN__ 1
+#define __FLT64X_IS_IEC_60559__ 2
+#define __DEC32_MANT_DIG__ 7
+#define __DEC32_MIN_EXP__ (-94)
+#define __DEC32_MAX_EXP__ 97
+#define __DEC32_MIN__ 1E-95DF
+#define __DEC32_MAX__ 9.999999E96DF
+#define __DEC32_EPSILON__ 1E-6DF
+#define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF
+#define __DEC64_MANT_DIG__ 16
+#define __DEC64_MIN_EXP__ (-382)
+#define __DEC64_MAX_EXP__ 385
+#define __DEC64_MIN__ 1E-383DD
+#define __DEC64_MAX__ 9.999999999999999E384DD
+#define __DEC64_EPSILON__ 1E-15DD
+#define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD
+#define __DEC128_MANT_DIG__ 34
+#define __DEC128_MIN_EXP__ (-6142)
+#define __DEC128_MAX_EXP__ 6145
+#define __DEC128_MIN__ 1E-6143DL
+#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL
+#define __DEC128_EPSILON__ 1E-33DL
+#define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL
+#define __REGISTER_PREFIX__ 
+#define __USER_LABEL_PREFIX__ 
+#define __GNUC_STDC_INLINE__ 1
+#define __NO_INLINE__ 1
+#define __STRICT_ANSI__ 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
+#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
+#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
+#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
+#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
+#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
+#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
+#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
+#define __GCC_ATOMIC_INT_LOCK_FREE 2
+#define __GCC_ATOMIC_LONG_LOCK_FREE 2
+#define __GCC_ATOMIC_LLONG_LOCK_FREE 2
+#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
+#define __HAVE_SPECULATION_SAFE_VALUE 1
+#define __GCC_HAVE_DWARF2_CFI_ASM 1
+#define __PRAGMA_REDEFINE_EXTNAME 1
+#define __SIZEOF_INT128__ 16
+#define __SIZEOF_WCHAR_T__ 4
+#define __SIZEOF_WINT_T__ 4
+#define __SIZEOF_PTRDIFF_T__ 8
+#define __amd64 1
+#define __amd64__ 1
+#define __x86_64 1
+#define __x86_64__ 1
+#define __SIZEOF_FLOAT80__ 16
+#define __SIZEOF_FLOAT128__ 16
+#define __ATOMIC_HLE_ACQUIRE 65536
+#define __ATOMIC_HLE_RELEASE 131072
+#define __GCC_ASM_FLAG_OUTPUTS__ 1
+#define __k8 1
+#define __k8__ 1
+#define __code_model_small__ 1
+#define __MMX__ 1
+#define __SSE__ 1
+#define __SSE2__ 1
+#define __FXSR__ 1
+#define __SSE_MATH__ 1
+#define __SSE2_MATH__ 1
+#define __MMX_WITH_SSE__ 1
+#define __SEG_FS 1
+#define __SEG_GS 1
+#define __gnu_linux__ 1
+#define __linux 1
+#define __linux__ 1
+#define __unix 1
+#define __unix__ 1
+#define __ELF__ 1
+#define __DECIMAL_BID_FORMAT__ 1
+# 0 "<command-line>"
+#define _GNU_SOURCE 1
+# 0 "<command-line>"
+# 1 "/usr/include/stdc-predef.h" 1 3 4
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _STDC_PREDEF_H 1
+
+/* This header is separate from features.h so that the compiler can
+   include it implicitly at the start of every compilation.  It must
+   not itself include <features.h> or any other header that includes
+   <features.h> because the implicit include comes before any feature
+   test macros that may be defined in a source file before it first
+   explicitly includes a system header.  GCC knows the name of this
+   header in order to preinclude it.  */
+
+/* glibc's intent is to support the IEC 559 math functionality, real
+   and complex.  If the GCC (4.9 and later) predefined macros
+   specifying compiler intent are available, use them to determine
+   whether the overall intent is to support these features; otherwise,
+   presume an older compiler has intent to support these features and
+   define these macros by default.  */
+
+
+
+#define __STDC_IEC_559__ 1
+
+
+
+
+
+
+
+#define __STDC_IEC_559_COMPLEX__ 1
+
+
+
+
+
+/* wchar_t uses Unicode 10.0.0.  Version 10.0 of the Unicode Standard is
+   synchronized with ISO/IEC 10646:2017, fifth edition, plus
+   the following additions from Amendment 1 to the fifth edition:
+   - 56 emoji characters
+   - 285 hentaigana
+   - 3 additional Zanabazar Square characters */
+#define __STDC_ISO_10646__ 201706L
+
+# 0 "<command-line>" 2
+# 482 "iostream"
+// Standard iostream objects -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/iostream
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.3  Standard iostream objects
+//
+
+
+#define _GLIBCXX_IOSTREAM 1
+
+       
+
+// Predefined symbols and macros -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/c++config.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{version}
+ */
+
+
+#define _GLIBCXX_CXX_CONFIG_H 1
+
+// The major release number for the GCC release the C++ library belongs to.
+#define _GLIBCXX_RELEASE 11
+
+// The datestamp of the C++ library in compressed ISO date format.
+#define __GLIBCXX__ 20210217
+
+// Macros for various attributes.
+//   _GLIBCXX_PURE
+//   _GLIBCXX_CONST
+//   _GLIBCXX_NORETURN
+//   _GLIBCXX_NOTHROW
+//   _GLIBCXX_VISIBILITY
+
+#define _GLIBCXX_PURE __attribute__ ((__pure__))
+
+
+
+#define _GLIBCXX_CONST __attribute__ ((__const__))
+
+
+
+#define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
+
+
+// See below for C++
+
+
+
+
+
+
+// Macros for visibility attributes.
+//   _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
+//   _GLIBCXX_VISIBILITY
+#define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY 1
+
+
+#define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
+#define _GLIBCXX_VISIBILITY2(V) __attribute__ ((__visibility__ (#V)))
+
+
+
+
+
+
+// Macros for deprecated attributes.
+//   _GLIBCXX_USE_DEPRECATED
+//   _GLIBCXX_DEPRECATED
+//   _GLIBCXX_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX11_DEPRECATED
+//   _GLIBCXX11_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX17_DEPRECATED
+//   _GLIBCXX17_DEPRECATED_SUGGEST( string-literal )
+//   _GLIBCXX20_DEPRECATED( string-literal )
+//   _GLIBCXX20_DEPRECATED_SUGGEST( string-literal )
+
+#define _GLIBCXX_USE_DEPRECATED 1
+
+
+
+#define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
+#define _GLIBCXX_DEPRECATED_SUGGEST(ALT) __attribute__ ((__deprecated__ ("use '" ALT "' instead")))
+
+
+
+
+
+
+
+#define _GLIBCXX11_DEPRECATED _GLIBCXX_DEPRECATED
+#define _GLIBCXX11_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
+
+
+
+
+
+
+#define _GLIBCXX17_DEPRECATED [[__deprecated__]]
+#define _GLIBCXX17_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX20_DEPRECATED(MSG) 
+#define _GLIBCXX20_DEPRECATED_SUGGEST(ALT) 
+
+
+// Macros for ABI tag attributes.
+
+#define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))
+
+
+// Macro to warn about unused results.
+
+#define _GLIBCXX_NODISCARD [[__nodiscard__]]
+
+
+
+
+
+
+
+
+// Macro for constexpr, to support in mixed 03/0x mode.
+
+
+#define _GLIBCXX_CONSTEXPR constexpr
+#define _GLIBCXX_USE_CONSTEXPR constexpr
+
+
+
+
+
+
+
+
+#define _GLIBCXX14_CONSTEXPR constexpr
+
+
+
+
+
+
+
+#define _GLIBCXX17_CONSTEXPR constexpr
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX20_CONSTEXPR 
+
+
+
+
+
+#define _GLIBCXX17_INLINE inline
+
+
+
+
+
+// Macro for noexcept, to support in mixed 03/0x mode.
+
+
+#define _GLIBCXX_NOEXCEPT noexcept
+#define _GLIBCXX_NOEXCEPT_IF(...) noexcept(__VA_ARGS__)
+#define _GLIBCXX_USE_NOEXCEPT noexcept
+#define _GLIBCXX_THROW(_EXC) 
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
+
+
+
+
+#define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
+
+
+
+
+
+
+#define _GLIBCXX_NOEXCEPT_PARM , bool _NE
+#define _GLIBCXX_NOEXCEPT_QUAL noexcept (_NE)
+
+
+
+
+
+// Macro for extern template, ie controlling template linkage via use
+// of extern keyword on template declaration. As documented in the g++
+// manual, it inhibits all implicit instantiations and is used
+// throughout the library to avoid multiple weak definitions for
+// required types that are already explicitly instantiated in the
+// library binary. This substantially reduces the binary size of
+// resulting executables.
+// Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
+// templates only in basic_string, thus activating its debug-mode
+// checks even at -O0.
+#define _GLIBCXX_EXTERN_TEMPLATE 1
+
+/*
+  Outline of libstdc++ namespaces.
+
+  namespace std
+  {
+    namespace __debug { }
+    namespace __parallel { }
+    namespace __cxx1998 { }
+
+    namespace __detail {
+      namespace __variant { }				// C++17
+    }
+
+    namespace rel_ops { }
+
+    namespace tr1
+    {
+      namespace placeholders { }
+      namespace regex_constants { }
+      namespace __detail { }
+    }
+
+    namespace tr2 { }
+    
+    namespace decimal { }
+
+    namespace chrono { }				// C++11
+    namespace placeholders { }				// C++11
+    namespace regex_constants { }			// C++11
+    namespace this_thread { }				// C++11
+    inline namespace literals {				// C++14
+      inline namespace chrono_literals { }		// C++14
+      inline namespace complex_literals { }		// C++14
+      inline namespace string_literals { }		// C++14
+      inline namespace string_view_literals { }		// C++17
+    }
+  }
+
+  namespace abi { }
+
+  namespace __gnu_cxx
+  {
+    namespace __detail { }
+  }
+
+  For full details see:
+  http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
+*/
+namespace std
+{
+  typedef __SIZE_TYPE__ 	size_t;
+  typedef __PTRDIFF_TYPE__	ptrdiff_t;
+
+
+  typedef decltype(nullptr)	nullptr_t;
+
+}
+
+#define _GLIBCXX_USE_DUAL_ABI 1
+
+
+
+
+
+
+
+#define _GLIBCXX_USE_CXX11_ABI 1
+
+
+
+namespace std
+{
+  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
+}
+namespace __gnu_cxx
+{
+  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
+}
+#define _GLIBCXX_NAMESPACE_CXX11 __cxx11::
+#define _GLIBCXX_BEGIN_NAMESPACE_CXX11 namespace __cxx11 {
+#define _GLIBCXX_END_NAMESPACE_CXX11 }
+#define _GLIBCXX_DEFAULT_ABI_TAG _GLIBCXX_ABI_TAG_CXX11
+
+
+
+
+
+
+
+// Defined if inline namespaces are used for versioning.
+#define _GLIBCXX_INLINE_VERSION 0
+
+// Inline namespace for symbol versioning.
+#define _GLIBCXX_BEGIN_NAMESPACE_VERSION 
+#define _GLIBCXX_END_NAMESPACE_VERSION 
+
+
+// Inline namespaces for special modes: debug, parallel.
+
+// Macros for namespace scope. Either namespace std:: or the name
+// of some nested namespace within it corresponding to the active mode.
+// _GLIBCXX_STD_A
+// _GLIBCXX_STD_C
+//
+// Macros for opening/closing conditional namespaces.
+// _GLIBCXX_BEGIN_NAMESPACE_ALGO
+// _GLIBCXX_END_NAMESPACE_ALGO
+// _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+// _GLIBCXX_END_NAMESPACE_CONTAINER
+
+
+
+
+
+
+#define _GLIBCXX_STD_C std
+#define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER 
+#define _GLIBCXX_END_NAMESPACE_CONTAINER 
+
+
+
+
+
+
+
+
+#define _GLIBCXX_STD_A std
+#define _GLIBCXX_BEGIN_NAMESPACE_ALGO 
+#define _GLIBCXX_END_NAMESPACE_ALGO 
+
+
+// GLIBCXX_ABI Deprecated
+// Define if compatibility should be provided for -mlong-double-64.
+#undef _GLIBCXX_LONG_DOUBLE_COMPAT
+// Define if compatibility should be provided for alternative 128-bit long
+// double formats.
+#undef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
+
+// Inline namespaces for long double 128 modes.
+
+#define _GLIBCXX_NAMESPACE_LDBL 
+#define _GLIBCXX_BEGIN_NAMESPACE_LDBL 
+#define _GLIBCXX_END_NAMESPACE_LDBL 
+
+
+
+#define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_CXX11
+#define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_CXX11
+#define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_CXX11
+
+
+
+
+
+
+
+
+// Debug Mode implies checking assertions.
+
+
+
+
+// Disable std::string explicit instantiation declarations in order to assert.
+
+
+
+
+
+// Assert.
+
+
+
+
+#define __glibcxx_assert_2(_Condition) 
+
+
+// Macros for race detectors.
+// _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
+// _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
+// atomic (lock-free) synchronization to race detectors:
+// the race detector will infer a happens-before arc from the former to the
+// latter when they share the same argument pointer.
+//
+// The most frequent use case for these macros (and the only case in the
+// current implementation of the library) is atomic reference counting:
+//   void _M_remove_reference()
+//   {
+//     _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
+//     if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
+//       {
+//         _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
+//         _M_destroy(__a);
+//       }
+//   }
+// The annotations in this example tell the race detector that all memory
+// accesses occurred when the refcount was positive do not race with
+// memory accesses which occurred after the refcount became zero.
+
+#define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) 
+
+
+#define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) 
+
+
+// Macros for C linkage: define extern "C" linkage only when using C++.
+#define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
+#define _GLIBCXX_END_EXTERN_C }
+
+#define _GLIBCXX_USE_ALLOCATOR_NEW 1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+// First includes.
+
+// Pick up any OS-specific definitions.
+// Specific definitions for GNU/Linux  -*- C++ -*-
+
+// Copyright (C) 2000-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/os_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+
+#define _GLIBCXX_OS_DEFINES 1
+
+// System-specific #define, typedefs, corrections, etc, go here.  This
+// file will come before all others.
+
+// This keeps isanum, et al from being propagated as macros.
+#define __NO_CTYPE 1
+
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _FEATURES_H 1
+
+/* These are defined by the user (or the compiler)
+   to specify the desired environment:
+
+   __STRICT_ANSI__	ISO Standard C.
+   _ISOC99_SOURCE	Extensions to ISO C89 from ISO C99.
+   _ISOC11_SOURCE	Extensions to ISO C99 from ISO C11.
+   __STDC_WANT_LIB_EXT2__
+			Extensions to ISO C99 from TR 27431-2:2010.
+   __STDC_WANT_IEC_60559_BFP_EXT__
+			Extensions to ISO C11 from TS 18661-1:2014.
+   __STDC_WANT_IEC_60559_FUNCS_EXT__
+			Extensions to ISO C11 from TS 18661-4:2015.
+   __STDC_WANT_IEC_60559_TYPES_EXT__
+			Extensions to ISO C11 from TS 18661-3:2015.
+
+   _POSIX_SOURCE	IEEE Std 1003.1.
+   _POSIX_C_SOURCE	If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
+			if >=199309L, add IEEE Std 1003.1b-1993;
+			if >=199506L, add IEEE Std 1003.1c-1995;
+			if >=200112L, all of IEEE 1003.1-2004
+			if >=200809L, all of IEEE 1003.1-2008
+   _XOPEN_SOURCE	Includes POSIX and XPG things.  Set to 500 if
+			Single Unix conformance is wanted, to 600 for the
+			sixth revision, to 700 for the seventh revision.
+   _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
+   _LARGEFILE_SOURCE	Some more functions for correct standard I/O.
+   _LARGEFILE64_SOURCE	Additional functionality from LFS for large files.
+   _FILE_OFFSET_BITS=N	Select default filesystem interface.
+   _ATFILE_SOURCE	Additional *at interfaces.
+   _GNU_SOURCE		All of the above, plus GNU extensions.
+   _DEFAULT_SOURCE	The default set of features (taking precedence over
+			__STRICT_ANSI__).
+
+   _FORTIFY_SOURCE	Add security hardening to many library functions.
+			Set to 1 or 2; 2 performs stricter checks than 1.
+
+   _REENTRANT, _THREAD_SAFE
+			Obsolete; equivalent to _POSIX_C_SOURCE=199506L.
+
+   The `-ansi' switch to the GNU C compiler, and standards conformance
+   options such as `-std=c99', define __STRICT_ANSI__.  If none of
+   these are defined, or if _DEFAULT_SOURCE is defined, the default is
+   to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
+   200809L, as well as enabling miscellaneous functions from BSD and
+   SVID.  If more than one of these are defined, they accumulate.  For
+   example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together
+   give you ISO C, 1003.1, and 1003.2, but nothing else.
+
+   These are defined by this file and are used by the
+   header files to decide what to declare or define:
+
+   __GLIBC_USE (F)	Define things from feature set F.  This is defined
+			to 1 or 0; the subsequent macros are either defined
+			or undefined, and those tests should be moved to
+			__GLIBC_USE.
+   __USE_ISOC11		Define ISO C11 things.
+   __USE_ISOC99		Define ISO C99 things.
+   __USE_ISOC95		Define ISO C90 AMD1 (C95) things.
+   __USE_ISOCXX11	Define ISO C++11 things.
+   __USE_POSIX		Define IEEE Std 1003.1 things.
+   __USE_POSIX2		Define IEEE Std 1003.2 things.
+   __USE_POSIX199309	Define IEEE Std 1003.1, and .1b things.
+   __USE_POSIX199506	Define IEEE Std 1003.1, .1b, .1c and .1i things.
+   __USE_XOPEN		Define XPG things.
+   __USE_XOPEN_EXTENDED	Define X/Open Unix things.
+   __USE_UNIX98		Define Single Unix V2 things.
+   __USE_XOPEN2K        Define XPG6 things.
+   __USE_XOPEN2KXSI     Define XPG6 XSI things.
+   __USE_XOPEN2K8       Define XPG7 things.
+   __USE_XOPEN2K8XSI    Define XPG7 XSI things.
+   __USE_LARGEFILE	Define correct standard I/O things.
+   __USE_LARGEFILE64	Define LFS things with separate names.
+   __USE_FILE_OFFSET64	Define 64bit interface as default.
+   __USE_MISC		Define things from 4.3BSD or System V Unix.
+   __USE_ATFILE		Define *at interfaces and AT_* constants for them.
+   __USE_GNU		Define GNU extensions.
+   __USE_FORTIFY_LEVEL	Additional security measures used, according to level.
+
+   The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
+   defined by this file unconditionally.  `__GNU_LIBRARY__' is provided
+   only for compatibility.  All new code should use the other symbols
+   to test for features.
+
+   All macros listed above as possibly being defined by this file are
+   explicitly undefined if they are not explicitly defined.
+   Feature-test macros that are not defined by the user or compiler
+   but are implied by the other feature-test macros defined (or by the
+   lack of any definitions) are defined by the file.
+
+   ISO C feature test macros depend on the definition of the macro
+   when an affected header is included, not when the first system
+   header is included, and so they are handled in
+   <bits/libc-header-start.h>, which does not have a multiple include
+   guard.  Feature test macros that can be handled from the first
+   system header included are handled here.  */
+
+
+/* Undefine everything, so we get a clean slate.  */
+#undef __USE_ISOC11
+#undef __USE_ISOC99
+#undef __USE_ISOC95
+#undef __USE_ISOCXX11
+#undef __USE_POSIX
+#undef __USE_POSIX2
+#undef __USE_POSIX199309
+#undef __USE_POSIX199506
+#undef __USE_XOPEN
+#undef __USE_XOPEN_EXTENDED
+#undef __USE_UNIX98
+#undef __USE_XOPEN2K
+#undef __USE_XOPEN2KXSI
+#undef __USE_XOPEN2K8
+#undef __USE_XOPEN2K8XSI
+#undef __USE_LARGEFILE
+#undef __USE_LARGEFILE64
+#undef __USE_FILE_OFFSET64
+#undef __USE_MISC
+#undef __USE_ATFILE
+#undef __USE_GNU
+#undef __USE_FORTIFY_LEVEL
+#undef __KERNEL_STRICT_NAMES
+#undef __GLIBC_USE_DEPRECATED_GETS
+
+/* Suppress kernel-name space pollution unless user expressedly asks
+   for it.  */
+
+#define __KERNEL_STRICT_NAMES 
+
+
+/* Convenience macro to test the version of gcc.
+   Use like this:
+   #if __GNUC_PREREQ (2,8)
+   ... code requiring gcc 2.8 or later ...
+   #endif
+   Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was
+   added in 2.0.  */
+
+#define __GNUC_PREREQ(maj,min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+
+
+
+
+
+/* Similarly for clang.  Features added to GCC after version 4.2 may
+   or may not also be available in clang, and clang's definitions of
+   __GNUC(_MINOR)__ are fixed at 4 and 2 respectively.  Not all such
+   features can be queried via __has_extension/__has_feature.  */
+
+
+
+
+#define __glibc_clang_prereq(maj,min) 0
+
+
+/* Whether to use feature set F.  */
+#define __GLIBC_USE(F) __GLIBC_USE_ ## F
+
+/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for
+   _DEFAULT_SOURCE.  If _DEFAULT_SOURCE is present we do not
+   issue a warning; the expectation is that the source is being
+   transitioned to use the new macro.  */
+
+
+
+
+
+
+
+/* If _GNU_SOURCE was defined by the user, turn on all the other features.  */
+
+#undef _ISOC95_SOURCE
+#define _ISOC95_SOURCE 1
+#undef _ISOC99_SOURCE
+#define _ISOC99_SOURCE 1
+#undef _ISOC11_SOURCE
+#define _ISOC11_SOURCE 1
+#undef _POSIX_SOURCE
+#define _POSIX_SOURCE 1
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 700
+#undef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED 1
+#undef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE 1
+#undef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE 1
+#undef _ATFILE_SOURCE
+#define _ATFILE_SOURCE 1
+
+
+/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined,
+   define _DEFAULT_SOURCE.  */
+
+
+
+
+
+#undef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE 1
+
+
+/* This is to enable the ISO C11 extension.  */
+
+
+#define __USE_ISOC11 1
+
+
+/* This is to enable the ISO C99 extension.  */
+
+
+#define __USE_ISOC99 1
+
+
+/* This is to enable the ISO C90 Amendment 1:1995 extension.  */
+
+
+#define __USE_ISOC95 1
+
+
+
+/* This is to enable compatibility for ISO C++17.  */
+
+#define __USE_ISOC11 1
+
+/* This is to enable compatibility for ISO C++11.
+   Check the temporary macro for now, too.  */
+
+#define __USE_ISOCXX11 1
+#define __USE_ISOC99 1
+
+
+
+/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE
+   is defined, use POSIX.1-2008 (or another version depending on
+   _XOPEN_SOURCE).  */
+
+
+
+
+#undef _POSIX_SOURCE
+#define _POSIX_SOURCE 1
+#undef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+
+
+
+/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
+   defined in all multithreaded code.  GNU libc has not required this
+   for many years.  We now treat them as compatibility synonyms for
+   _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with
+   comprehensive support for multithreaded code.  Using them never
+   lowers the selected level of POSIX conformance, only raises it.  */
+
+
+
+
+
+
+
+
+
+
+#define __USE_POSIX 1
+
+
+
+#define __USE_POSIX2 1
+
+
+
+#define __USE_POSIX199309 1
+
+
+
+#define __USE_POSIX199506 1
+
+
+
+#define __USE_XOPEN2K 1
+#undef __USE_ISOC95
+#define __USE_ISOC95 1
+#undef __USE_ISOC99
+#define __USE_ISOC99 1
+
+
+
+#define __USE_XOPEN2K8 1
+#undef _ATFILE_SOURCE
+#define _ATFILE_SOURCE 1
+
+
+
+#define __USE_XOPEN 1
+
+#define __USE_XOPEN_EXTENDED 1
+#define __USE_UNIX98 1
+#undef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE 1
+
+
+#define __USE_XOPEN2K8 1
+#define __USE_XOPEN2K8XSI 1
+
+#define __USE_XOPEN2K 1
+#define __USE_XOPEN2KXSI 1
+#undef __USE_ISOC95
+#define __USE_ISOC95 1
+#undef __USE_ISOC99
+#define __USE_ISOC99 1
+
+
+
+
+
+
+
+
+
+#define __USE_LARGEFILE 1
+
+
+
+#define __USE_LARGEFILE64 1
+
+
+
+
+
+
+
+#define __USE_MISC 1
+
+
+
+#define __USE_ATFILE 1
+
+
+
+#define __USE_GNU 1
+
+
+
+#define __USE_FORTIFY_LEVEL 0
+
+
+/* The function 'gets' existed in C89, but is impossible to use
+   safely.  It has been removed from ISO C11 and ISO C++14.  Note: for
+   compatibility with various implementations of <cstdio>, this test
+   must consider only the value of __cplusplus when compiling C++.  */
+
+#define __GLIBC_USE_DEPRECATED_GETS 0
+
+
+
+
+/* Get definitions of __STDC_* predefined macros, if the compiler has
+   not preincluded this header automatically.  */
+
+
+/* This macro indicates that the installed library is the GNU C Library.
+   For historic reasons the value now is 6 and this will stay from now
+   on.  The use of this variable is deprecated.  Use __GLIBC__ and
+   __GLIBC_MINOR__ now (see below) when you want to test for a specific
+   GNU C library version and use the values in <gnu/lib-names.h> to get
+   the sonames of the shared libraries.  */
+#undef __GNU_LIBRARY__
+#define __GNU_LIBRARY__ 6
+
+/* Major and minor version number of the GNU C library package.  Use
+   these macros to test for features in specific releases.  */
+#define __GLIBC__ 2
+#define __GLIBC_MINOR__ 28
+
+#define __GLIBC_PREREQ(maj,min) ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
+
+
+/* This is here only because every header file already includes this one.  */
+
+
+/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _SYS_CDEFS_H 1
+
+/* We are almost always included from features.h. */
+
+
+
+
+/* The GNU libc does not support any K&R compilers or the traditional mode
+   of ISO C compilers anymore.  Check for some of the combinations not
+   anymore supported.  */
+
+
+
+
+/* Some user header file might have defined this before.  */
+#undef __P
+#undef __PMT
+
+
+
+/* All functions, except those with callbacks or those that
+   synchronize memory, are leaf functions.  */
+
+#define __LEAF , __leaf__
+#define __LEAF_ATTR __attribute__ ((__leaf__))
+
+
+
+
+
+/* GCC can always grok prototypes.  For C++ programs we add throw()
+   to help it optimize the function calls.  But this works only with
+   gcc 2.8.x and egcs.  For gcc 3.2 and up we even mark C functions
+   as non-throwing using a function attribute since programs can use
+   the -fexceptions options for C code as well.  */
+
+
+
+
+
+
+
+#define __THROW throw ()
+#define __THROWNL throw ()
+#define __NTH(fct) __LEAF_ATTR fct throw ()
+#define __NTHNL(fct) fct throw ()
+
+
+
+
+
+
+
+
+
+/* Compilers that are not clang may object to
+       #if defined __clang__ && __has_extension(...)
+   even though they do not need to evaluate the right-hand side of the &&.  */
+
+
+
+#define __glibc_clang_has_extension(ext) 0
+
+
+/* These two macros are not used in glibc anymore.  They are kept here
+   only because some other projects expect the macros to be defined.  */
+#define __P(args) args
+#define __PMT(args) args
+
+/* For these things, GCC behaves the ANSI way normally,
+   and the non-ANSI way under -traditional.  */
+
+#define __CONCAT(x,y) x ## y
+#define __STRING(x) #x
+
+/* This is not a typedef so `const __ptr_t' does the right thing.  */
+#define __ptr_t void *
+
+
+/* C++ needs to know that types and declarations are C, not C++.  */
+
+#define __BEGIN_DECLS extern "C" {
+#define __END_DECLS }
+
+
+
+
+
+
+/* Fortify support.  */
+#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
+#define __bos0(ptr) __builtin_object_size (ptr, 0)
+
+
+#define __warndecl(name,msg) extern void name (void) __attribute__((__warning__ (msg)))
+
+#define __warnattr(msg) __attribute__((__warning__ (msg)))
+#define __errordecl(name,msg) extern void name (void) __attribute__((__error__ (msg)))
+
+
+
+
+
+
+
+/* Support for flexible arrays.
+   Headers that should use flexible arrays only if they're "real"
+   (e.g. only if they won't affect sizeof()) should test
+   #if __glibc_c99_flexarr_available.  */
+
+
+
+
+/* GCC 2.97 supports C99 flexible array members as an extension,
+   even when in C89 mode or compiling C++ (any version).  */
+#define __flexarr []
+#define __glibc_c99_flexarr_available 1
+
+
+/* __asm__ ("xyz") is used throughout the headers to rename functions
+   at the assembly language level.  This is wrapped by the __REDIRECT
+   macro, in order to support compilers that can do this some other
+   way.  When compilers don't support asm-names at all, we have to do
+   preprocessor tricks instead (which don't have exactly the right
+   semantics, but it's the best we can do).
+
+   Example:
+   int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
+
+
+
+#define __REDIRECT(name,proto,alias) name proto __asm__ (__ASMNAME (#alias))
+
+#define __REDIRECT_NTH(name,proto,alias) name proto __THROW __asm__ (__ASMNAME (#alias))
+
+#define __REDIRECT_NTHNL(name,proto,alias) name proto __THROWNL __asm__ (__ASMNAME (#alias))
+
+
+
+
+
+
+
+#define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define __ASMNAME2(prefix,cname) __STRING (prefix) cname
+
+/*
+#elif __SOME_OTHER_COMPILER__
+
+	_Pragma("let " #name " = " #alias)
+*/
+
+
+/* GCC has various useful declarations that can be made with the
+   `__attribute__' syntax.  All of the ways we use this do fine if
+   they are omitted for compilers that don't understand it. */
+
+
+
+
+/* At some point during the gcc 2.96 development the `malloc' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_malloc__ __attribute__ ((__malloc__))
+
+
+
+
+/* Tell the compiler which arguments to an allocation function
+   indicate the size of the allocation.  */
+
+#define __attribute_alloc_size__(params) __attribute__ ((__alloc_size__ params))
+
+
+
+
+
+/* At some point during the gcc 2.96 development the `pure' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_pure__ __attribute__ ((__pure__))
+
+
+
+
+/* This declaration tells the compiler that the value is constant.  */
+
+#define __attribute_const__ __attribute__ ((__const__))
+
+
+
+
+/* At some point during the gcc 3.1 development the `used' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.  */
+
+#define __attribute_used__ __attribute__ ((__used__))
+#define __attribute_noinline__ __attribute__ ((__noinline__))
+
+
+
+
+
+/* Since version 3.2, gcc allows marking deprecated functions.  */
+
+#define __attribute_deprecated__ __attribute__ ((__deprecated__))
+
+
+
+
+/* Since version 4.5, gcc also allows one to specify the message printed
+   when a deprecated function is used.  clang claims to be gcc 4.2, but
+   may also support this feature.  */
+
+
+#define __attribute_deprecated_msg__(msg) __attribute__ ((__deprecated__ (msg)))
+
+
+
+
+
+/* At some point during the gcc 2.8 development the `format_arg' attribute
+   for functions was introduced.  We don't want to use it unconditionally
+   (although this would be possible) since it generates warnings.
+   If several `format_arg' attributes are given for the same function, in
+   gcc-3.0 and older, all but the last one are ignored.  In newer gccs,
+   all designated arguments are considered.  */
+
+#define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
+
+
+
+
+/* At some point during the gcc 2.97 development the `strfmon' format
+   attribute for functions was introduced.  We don't want to use it
+   unconditionally (although this would be possible) since it
+   generates warnings.  */
+
+#define __attribute_format_strfmon__(a,b) __attribute__ ((__format__ (__strfmon__, a, b)))
+
+
+
+
+
+/* The nonull function attribute allows to mark pointer parameters which
+   must not be NULL.  */
+
+#define __nonnull(params) __attribute__ ((__nonnull__ params))
+
+
+
+
+/* If fortification mode, we warn about unused results of certain
+   function calls which can lead to problems.  */
+
+#define __attribute_warn_unused_result__ __attribute__ ((__warn_unused_result__))
+
+
+
+
+
+
+
+
+#define __wur 
+
+
+/* Forces a function to be always inlined.  */
+
+/* The Linux kernel defines __always_inline in stddef.h (283d7573), and
+   it conflicts with this definition.  Therefore undefine it first to
+   allow either header to be included first.  */
+#undef __always_inline
+#define __always_inline __inline __attribute__ ((__always_inline__))
+
+
+
+
+
+/* Associate error messages with the source location of the call site rather
+   than with the source location inside the function.  */
+
+#define __attribute_artificial__ __attribute__ ((__artificial__))
+
+
+
+
+/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
+   inline semantics, unless -fgnu89-inline is used.  Using __GNUC_STDC_INLINE__
+   or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
+   older than 4.3 may define these macros and still not guarantee GNU inlining
+   semantics.
+
+   clang++ identifies itself as gcc-4.2, but has support for GNU inlining
+   semantics, that can be checked fot by using the __GNUC_STDC_INLINE_ and
+   __GNUC_GNU_INLINE__ macro definitions.  */
+
+
+
+
+#define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
+#define __extern_always_inline extern __always_inline __attribute__ ((__gnu_inline__))
+
+
+
+
+
+
+
+
+#define __fortify_function __extern_always_inline __attribute_artificial__
+
+
+/* GCC 4.3 and above allow passing all anonymous arguments of an
+   __extern_always_inline function to some other vararg function.  */
+
+#define __va_arg_pack() __builtin_va_arg_pack ()
+#define __va_arg_pack_len() __builtin_va_arg_pack_len ()
+
+
+/* It is possible to compile containing GCC extensions even if GCC is
+   run in pedantic mode if the uses are carefully marked using the
+   `__extension__' keyword.  But this is not generally available before
+   version 2.8.  */
+
+
+
+
+/* __restrict is known in EGCS 1.2 and above. */
+
+
+
+
+
+
+
+
+/* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is
+     array_name[restrict]
+   GCC 3.1 supports this.  */
+
+
+
+
+#define __restrict_arr 
+
+
+
+#define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
+#define __glibc_likely(cond) __builtin_expect ((cond), 1)
+
+
+
+
+
+
+#define __glibc_has_attribute(attr) __has_attribute (attr)
+
+
+
+
+
+
+/* Describes a char array whose address can safely be passed as the first
+   argument to strncpy and strncat, as the char array is not necessarily
+   a NUL-terminated string.  */
+#define __attribute_nonstring__ __attribute__ ((__nonstring__))
+
+
+
+
+
+
+
+
+
+
+
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+/* Properties of long double type.  ldbl-96 version.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */
+
+
+#define __LDBL_REDIR1(name,proto,alias) name proto
+#define __LDBL_REDIR(name,proto) name proto
+#define __LDBL_REDIR1_NTH(name,proto,alias) name proto __THROW
+#define __LDBL_REDIR_NTH(name,proto) name proto __THROW
+#define __LDBL_REDIR_DECL(name) 
+
+#define __REDIRECT_LDBL(name,proto,alias) __REDIRECT (name, proto, alias)
+#define __REDIRECT_NTH_LDBL(name,proto,alias) __REDIRECT_NTH (name, proto, alias)
+
+
+
+
+/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE.  This is
+   intended for use in preprocessor macros.
+
+   Note: MESSAGE must be a _single_ string; concatenation of string
+   literals is not supported.  */
+
+#define __glibc_macro_warning1(message) _Pragma (#message)
+#define __glibc_macro_warning(message) __glibc_macro_warning1 (GCC warning message)
+
+
+
+
+
+/* Generic selection (ISO C11) is a C-only feature, available in GCC
+   since version 4.9.  Previous versions do not provide generic
+   selection, even though they might set __STDC_VERSION__ to 201112L,
+   when in -std=c11 mode.  Thus, we must check for !defined __GNUC__
+   when testing __STDC_VERSION__ for generic selection support.
+   On the other hand, Clang also defines __GNUC__, so a clang-specific
+   check is required to enable the use of generic selection.  */
+
+
+
+
+
+
+
+#define __HAVE_GENERIC_SELECTION 0
+
+
+
+
+/* If we don't have __REDIRECT, prototypes will be missing if
+   __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
+
+
+
+
+
+
+
+/* Decide whether we can define 'extern inline' functions in headers.  */
+
+
+
+
+
+
+
+/* This is here only because every header file already includes this one.
+   Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
+   <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
+   that will always return failure (and set errno to ENOSYS).  */
+/* This file is automatically generated.
+   This file selects the right generated file of `__stub_FUNCTION' macros
+   based on the architecture being compiled for.  */
+
+
+
+
+
+
+/* This file is automatically generated.
+   It defines a symbol `__stub_FUNCTION' for each function
+   in the C library which is a stub, meaning it will fail
+   every time called, usually setting errno to ENOSYS.  */
+
+
+
+
+
+#define __stub___compat_bdflush 
+#define __stub_chflags 
+#define __stub_fattach 
+#define __stub_fchflags 
+#define __stub_fdetach 
+#define __stub_getmsg 
+#define __stub_gtty 
+#define __stub_lchmod 
+#define __stub_putmsg 
+#define __stub_revoke 
+#define __stub_setlogin 
+#define __stub_sigreturn 
+#define __stub_sstk 
+#define __stub_stty 
+
+
+
+
+// Provide a declaration for the possibly deprecated gets function, as
+// glibc 2.15 and later does not declare gets for ISO C11 when
+// __GNU_SOURCE is defined.
+
+#undef _GLIBCXX_HAVE_GETS
+
+
+// Glibc 2.23 removed the obsolete isinf and isnan declarations. Check the
+// version dynamically in case it has changed since libstdc++ was configured.
+#define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23)
+
+
+// Since glibc 2.27 pthread_self() is usable without linking to libpthread.
+#define _GLIBCXX_NATIVE_THREAD_ID pthread_self()
+
+
+// Pick up any CPU-specific definitions.
+// Specific definitions for generic platforms  -*- C++ -*-
+
+// Copyright (C) 2005-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cpu_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+
+#define _GLIBCXX_CPU_DEFINES 1
+
+
+// If platform uses neither visibility nor psuedo-visibility,
+// specify empty default for namespace annotation macros.
+
+#define _GLIBCXX_PSEUDO_VISIBILITY(V) 
+
+
+// Certain function definitions that are meant to be overridable from
+// user code are decorated with this macro.  For some targets, this
+// macro causes these definitions to be weak.
+
+#define _GLIBCXX_WEAK_DEFINITION 
+
+
+// By default, we assume that __GXX_WEAK__ also means that there is support
+// for declaring functions as weak while not defining such functions.  This
+// allows for referring to functions provided by other libraries (e.g.,
+// libitm) without depending on them if the respective features are not used.
+
+#define _GLIBCXX_USE_WEAK_REF __GXX_WEAK__
+
+
+// Conditionally enable annotations for the Transactional Memory TS on C++11.
+// Most of the following conditions are due to limitations in the current
+// implementation.
+
+
+
+
+
+
+
+#define _GLIBCXX_TXN_SAFE 
+#define _GLIBCXX_TXN_SAFE_DYN 
+
+
+
+// In C++17 mathematical special functions are in namespace std.
+#define _GLIBCXX_USE_STD_SPEC_FUNCS 1
+
+
+
+
+
+// The remainder of the prewritten config is automatic; all the
+// user hooks are listed above.
+
+// Create a boolean flag to be used to determine if --fast-math is set.
+
+
+
+#define _GLIBCXX_FAST_MATH 0
+
+
+// This marks string literals in header files to be extracted for eventual
+// translation.  It is primarily used for messages in thrown exceptions; see
+// src/functexcept.cc.  We use __N because the more traditional _N is used
+// for something else under certain OSes (see BADNAMES).
+#define __N(msgid) (msgid)
+
+// For example, <windows.h> is known to #define min and max as macros...
+#undef min
+#undef max
+
+// N.B. these _GLIBCXX_USE_C99_XXX macros are defined unconditionally
+// so they should be tested with #if not with #ifdef.
+
+
+#define _GLIBCXX_USE_C99_MATH _GLIBCXX11_USE_C99_MATH
+
+
+#define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX11_USE_C99_COMPLEX
+
+
+#define _GLIBCXX_USE_C99_STDIO _GLIBCXX11_USE_C99_STDIO
+
+
+#define _GLIBCXX_USE_C99_STDLIB _GLIBCXX11_USE_C99_STDLIB
+
+
+#define _GLIBCXX_USE_C99_WCHAR _GLIBCXX11_USE_C99_WCHAR
+
+
+// Unless explicitly specified, enable char8_t extensions only if the core
+// language char8_t feature macro is defined.
+
+
+
+
+
+
+
+
+
+/* Define if __float128 is supported on this host.  */
+
+/* For powerpc64 don't use __float128 when it's the same type as long double. */
+
+#define _GLIBCXX_USE_FLOAT128 1
+
+
+
+// Define if float has the IEEE binary32 format.
+
+
+
+#define _GLIBCXX_FLOAT_IS_IEEE_BINARY32 1
+
+
+// Define if double has the IEEE binary64 format.
+
+
+
+#define _GLIBCXX_DOUBLE_IS_IEEE_BINARY64 1
+
+
+
+
+
+
+
+#define _GLIBCXX_HAS_BUILTIN(B) __has_builtin(B)
+
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_IS_SAME 1
+
+
+
+#define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
+
+
+#undef _GLIBCXX_HAS_BUILTIN
+
+
+#define __glibcxx_assert_1(_Condition) if (__builtin_is_constant_evaluated()) { void __failed_assertion(); if (!bool(_Condition)) __failed_assertion(); } else
+
+
+
+
+
+
+
+
+
+
+
+#define __glibcxx_assert(_Condition) do { __glibcxx_assert_1(_Condition) { __glibcxx_assert_2(_Condition); } } while (false)
+
+
+
+
+
+
+// PSTL configuration
+
+
+// This header is not installed for freestanding:
+
+// Preserved here so we have some idea which version of upstream we've pulled in
+// #define PSTL_VERSION 9000
+
+// For now this defaults to being based on the presence of Thread Building Blocks
+
+#define _GLIBCXX_USE_TBB_PAR_BACKEND __has_include(<tbb/tbb.h>)
+
+// This section will need some rework when a new (default) backend type is added
+
+
+
+#define _PSTL_PAR_BACKEND_SERIAL 
+
+
+#define _PSTL_ASSERT(_Condition) __glibcxx_assert(_Condition)
+#define _PSTL_ASSERT_MSG(_Condition,_Message) __glibcxx_assert(_Condition)
+
+// -*- C++ -*-
+//===-- pstl_config.h -----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+
+#define _PSTL_CONFIG_H 
+
+// The version is XYYZ, where X is major, YY is minor, and Z is patch (i.e. X.YY.Z)
+#define _PSTL_VERSION 12000
+#define _PSTL_VERSION_MAJOR (_PSTL_VERSION / 1000)
+#define _PSTL_VERSION_MINOR ((_PSTL_VERSION % 1000) / 10)
+#define _PSTL_VERSION_PATCH (_PSTL_VERSION % 10)
+
+
+
+
+
+// Check the user-defined macro for warnings
+
+
+
+
+
+#define _PSTL_USAGE_WARNINGS 0
+
+
+// Portability "#pragma" definition
+
+
+
+#define _PSTL_PRAGMA(x) _Pragma(#x)
+
+
+#define _PSTL_STRING_AUX(x) #x
+#define _PSTL_STRING(x) _PSTL_STRING_AUX(x)
+#define _PSTL_STRING_CONCAT(x,y) x #y
+
+
+
+
+
+
+#define _PSTL_HIDE_FROM_ABI_PUSH 
+#define _PSTL_HIDE_FROM_ABI_POP 
+
+
+// note that when ICC or Clang is in use, _PSTL_GCC_VERSION might not fully match
+// the actual GCC version on the system.
+#define _PSTL_GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+
+
+
+
+
+
+// Enable SIMD for compilers that support OpenMP 4.0
+
+
+#define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
+#define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
+#define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
+
+
+
+
+#define _PSTL_PRAGMA_FORCEINLINE 
+
+
+
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_SCAN(PRM) 
+#define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 
+#define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 
+
+
+// Should be defined to 1 for environments with a vendor implementation of C++17 execution policies
+#define _PSTL_CPP17_EXECUTION_POLICIES_PRESENT (_MSC_VER >= 1912)
+
+#define _PSTL_CPP14_2RANGE_MISMATCH_EQUAL_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201300L || __cpp_lib_robust_nonmodifying_seq_ops == 201304)
+
+#define _PSTL_CPP14_MAKE_REVERSE_ITERATOR_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201402L || __cpp_lib_make_reverse_iterator == 201402)
+
+#define _PSTL_CPP14_INTEGER_SEQUENCE_PRESENT (_MSC_VER >= 1900 || __cplusplus >= 201402L)
+#define _PSTL_CPP14_VARIABLE_TEMPLATES_PRESENT (!__INTEL_COMPILER || __INTEL_COMPILER >= 1700) && (_MSC_FULL_VER >= 190023918 || __cplusplus >= 201402L)
+
+
+#define _PSTL_EARLYEXIT_PRESENT (__INTEL_COMPILER >= 1800)
+#define _PSTL_MONOTONIC_PRESENT (__INTEL_COMPILER >= 1800)
+
+
+#define _PSTL_UDR_PRESENT 1
+
+
+
+
+#define _PSTL_UDS_PRESENT (__INTEL_COMPILER >= 1900 && __INTEL_COMPILER_BUILD_DATE >= 20180626)
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_EARLYEXIT 
+
+
+
+
+
+
+#define _PSTL_PRAGMA_SIMD_ORDERED_MONOTONIC(PRM) 
+#define _PSTL_PRAGMA_SIMD_ORDERED_MONOTONIC_2ARGS(PRM1,PRM2) 
+
+
+// Declaration of reduction functor, where
+// NAME - the name of the functor
+// OP - type of the callable object with the reduction operation
+// omp_in - refers to the local partial result
+// omp_out - refers to the final value of the combiner operator
+// omp_priv - refers to the private copy of the initial value
+// omp_orig - refers to the original variable to be reduced
+#define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME,OP) _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
+
+
+
+
+
+#define _PSTL_PRAGMA_VECTOR_UNALIGNED 
+
+
+// Check the user-defined macro to use non-temporal stores
+
+
+
+#define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED 
+
+
+
+
+
+#define _PSTL_PRAGMA_LOCATION " [Parallel STL message]: "
+
+
+#define _PSTL_PRAGMA_MESSAGE_IMPL(x) _PSTL_PRAGMA(message(_PSTL_STRING_CONCAT(_PSTL_PRAGMA_LOCATION, x)))
+
+
+
+
+
+#define _PSTL_PRAGMA_MESSAGE(x) 
+#define _PSTL_PRAGMA_MESSAGE_POLICIES(x) 
+
+
+// broken macros
+#define _PSTL_CPP11_STD_ROTATE_BROKEN ((__GLIBCXX__ && __GLIBCXX__ < 20150716) || (_MSC_VER && _MSC_VER < 1800))
+
+#define _PSTL_ICC_18_OMP_SIMD_BROKEN (__INTEL_COMPILER == 1800)
+
+
+
+
+// End of prewritten config; the settings discovered at configure time follow.
+/* config.h.  Generated from config.h.in by configure.  */
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the `acosf' function. */
+#define _GLIBCXX_HAVE_ACOSF 1
+
+/* Define to 1 if you have the `acosl' function. */
+#define _GLIBCXX_HAVE_ACOSL 1
+
+/* Define to 1 if you have the `aligned_alloc' function. */
+#define _GLIBCXX_HAVE_ALIGNED_ALLOC 1
+
+/* Define to 1 if you have the <arpa/inet.h> header file. */
+#define _GLIBCXX_HAVE_ARPA_INET_H 1
+
+/* Define to 1 if you have the `asinf' function. */
+#define _GLIBCXX_HAVE_ASINF 1
+
+/* Define to 1 if you have the `asinl' function. */
+#define _GLIBCXX_HAVE_ASINL 1
+
+/* Define to 1 if the target assembler supports .symver directive. */
+#define _GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE 1
+
+/* Define to 1 if you have the `atan2f' function. */
+#define _GLIBCXX_HAVE_ATAN2F 1
+
+/* Define to 1 if you have the `atan2l' function. */
+#define _GLIBCXX_HAVE_ATAN2L 1
+
+/* Define to 1 if you have the `atanf' function. */
+#define _GLIBCXX_HAVE_ATANF 1
+
+/* Define to 1 if you have the `atanl' function. */
+#define _GLIBCXX_HAVE_ATANL 1
+
+/* Defined if shared_ptr reference counting should use atomic operations. */
+#define _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY 1
+
+/* Define to 1 if you have the `at_quick_exit' function. */
+#define _GLIBCXX_HAVE_AT_QUICK_EXIT 1
+
+/* Define to 1 if the target assembler supports thread-local storage. */
+/* #undef _GLIBCXX_HAVE_CC_TLS */
+
+/* Define to 1 if you have the `ceilf' function. */
+#define _GLIBCXX_HAVE_CEILF 1
+
+/* Define to 1 if you have the `ceill' function. */
+#define _GLIBCXX_HAVE_CEILL 1
+
+/* Define to 1 if you have the <complex.h> header file. */
+#define _GLIBCXX_HAVE_COMPLEX_H 1
+
+/* Define to 1 if you have the `cosf' function. */
+#define _GLIBCXX_HAVE_COSF 1
+
+/* Define to 1 if you have the `coshf' function. */
+#define _GLIBCXX_HAVE_COSHF 1
+
+/* Define to 1 if you have the `coshl' function. */
+#define _GLIBCXX_HAVE_COSHL 1
+
+/* Define to 1 if you have the `cosl' function. */
+#define _GLIBCXX_HAVE_COSL 1
+
+/* Define to 1 if you have the <dirent.h> header file. */
+#define _GLIBCXX_HAVE_DIRENT_H 1
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#define _GLIBCXX_HAVE_DLFCN_H 1
+
+/* Define to 1 if you have the <endian.h> header file. */
+#define _GLIBCXX_HAVE_ENDIAN_H 1
+
+/* Define to 1 if GCC 4.6 supported std::exception_ptr for the target */
+#define _GLIBCXX_HAVE_EXCEPTION_PTR_SINCE_GCC46 1
+
+/* Define to 1 if you have the <execinfo.h> header file. */
+#define _GLIBCXX_HAVE_EXECINFO_H 1
+
+/* Define to 1 if you have the `expf' function. */
+#define _GLIBCXX_HAVE_EXPF 1
+
+/* Define to 1 if you have the `expl' function. */
+#define _GLIBCXX_HAVE_EXPL 1
+
+/* Define to 1 if you have the `fabsf' function. */
+#define _GLIBCXX_HAVE_FABSF 1
+
+/* Define to 1 if you have the `fabsl' function. */
+#define _GLIBCXX_HAVE_FABSL 1
+
+/* Define to 1 if you have the <fcntl.h> header file. */
+#define _GLIBCXX_HAVE_FCNTL_H 1
+
+/* Define to 1 if you have the <fenv.h> header file. */
+#define _GLIBCXX_HAVE_FENV_H 1
+
+/* Define to 1 if you have the `finite' function. */
+#define _GLIBCXX_HAVE_FINITE 1
+
+/* Define to 1 if you have the `finitef' function. */
+#define _GLIBCXX_HAVE_FINITEF 1
+
+/* Define to 1 if you have the `finitel' function. */
+#define _GLIBCXX_HAVE_FINITEL 1
+
+/* Define to 1 if you have the <float.h> header file. */
+#define _GLIBCXX_HAVE_FLOAT_H 1
+
+/* Define to 1 if you have the `floorf' function. */
+#define _GLIBCXX_HAVE_FLOORF 1
+
+/* Define to 1 if you have the `floorl' function. */
+#define _GLIBCXX_HAVE_FLOORL 1
+
+/* Define to 1 if you have the `fmodf' function. */
+#define _GLIBCXX_HAVE_FMODF 1
+
+/* Define to 1 if you have the `fmodl' function. */
+#define _GLIBCXX_HAVE_FMODL 1
+
+/* Define to 1 if you have the `fpclass' function. */
+/* #undef _GLIBCXX_HAVE_FPCLASS */
+
+/* Define to 1 if you have the <fp.h> header file. */
+/* #undef _GLIBCXX_HAVE_FP_H */
+
+/* Define to 1 if you have the `frexpf' function. */
+#define _GLIBCXX_HAVE_FREXPF 1
+
+/* Define to 1 if you have the `frexpl' function. */
+#define _GLIBCXX_HAVE_FREXPL 1
+
+/* Define if _Unwind_GetIPInfo is available. */
+#define _GLIBCXX_HAVE_GETIPINFO 1
+
+/* Define if gets is available in <stdio.h> before C++14. */
+#define _GLIBCXX_HAVE_GETS 1
+
+/* Define to 1 if you have the `hypot' function. */
+#define _GLIBCXX_HAVE_HYPOT 1
+
+/* Define to 1 if you have the `hypotf' function. */
+#define _GLIBCXX_HAVE_HYPOTF 1
+
+/* Define to 1 if you have the `hypotl' function. */
+#define _GLIBCXX_HAVE_HYPOTL 1
+
+/* Define if you have the iconv() function. */
+#define _GLIBCXX_HAVE_ICONV 1
+
+/* Define to 1 if you have the <ieeefp.h> header file. */
+/* #undef _GLIBCXX_HAVE_IEEEFP_H */
+
+/* Define if int64_t is available in <stdint.h>. */
+#define _GLIBCXX_HAVE_INT64_T 1
+
+/* Define if int64_t is a long. */
+#define _GLIBCXX_HAVE_INT64_T_LONG 1
+
+/* Define if int64_t is a long long. */
+/* #undef _GLIBCXX_HAVE_INT64_T_LONG_LONG */
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define _GLIBCXX_HAVE_INTTYPES_H 1
+
+/* Define to 1 if you have the `isinf' function. */
+/* #undef _GLIBCXX_HAVE_ISINF */
+
+/* Define to 1 if you have the `isinff' function. */
+#define _GLIBCXX_HAVE_ISINFF 1
+
+/* Define to 1 if you have the `isinfl' function. */
+#define _GLIBCXX_HAVE_ISINFL 1
+
+/* Define to 1 if you have the `isnan' function. */
+/* #undef _GLIBCXX_HAVE_ISNAN */
+
+/* Define to 1 if you have the `isnanf' function. */
+#define _GLIBCXX_HAVE_ISNANF 1
+
+/* Define to 1 if you have the `isnanl' function. */
+#define _GLIBCXX_HAVE_ISNANL 1
+
+/* Defined if iswblank exists. */
+#define _GLIBCXX_HAVE_ISWBLANK 1
+
+/* Define if LC_MESSAGES is available in <locale.h>. */
+#define _GLIBCXX_HAVE_LC_MESSAGES 1
+
+/* Define to 1 if you have the `ldexpf' function. */
+#define _GLIBCXX_HAVE_LDEXPF 1
+
+/* Define to 1 if you have the `ldexpl' function. */
+#define _GLIBCXX_HAVE_LDEXPL 1
+
+/* Define to 1 if you have the <libintl.h> header file. */
+#define _GLIBCXX_HAVE_LIBINTL_H 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_AS 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_DATA 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_FSIZE 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_RSS 1
+
+/* Only used in build directory testsuite_hooks.h. */
+#define _GLIBCXX_HAVE_LIMIT_VMEM 0
+
+/* Define if link is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_LINK 1
+
+/* Define if futex syscall is available. */
+#define _GLIBCXX_HAVE_LINUX_FUTEX 1
+
+/* Define to 1 if you have the <linux/random.h> header file. */
+#define _GLIBCXX_HAVE_LINUX_RANDOM_H 1
+
+/* Define to 1 if you have the <linux/types.h> header file. */
+#define _GLIBCXX_HAVE_LINUX_TYPES_H 1
+
+/* Define to 1 if you have the <locale.h> header file. */
+#define _GLIBCXX_HAVE_LOCALE_H 1
+
+/* Define to 1 if you have the `log10f' function. */
+#define _GLIBCXX_HAVE_LOG10F 1
+
+/* Define to 1 if you have the `log10l' function. */
+#define _GLIBCXX_HAVE_LOG10L 1
+
+/* Define to 1 if you have the `logf' function. */
+#define _GLIBCXX_HAVE_LOGF 1
+
+/* Define to 1 if you have the `logl' function. */
+#define _GLIBCXX_HAVE_LOGL 1
+
+/* Define to 1 if you have the <machine/endian.h> header file. */
+/* #undef _GLIBCXX_HAVE_MACHINE_ENDIAN_H */
+
+/* Define to 1 if you have the <machine/param.h> header file. */
+/* #undef _GLIBCXX_HAVE_MACHINE_PARAM_H */
+
+/* Define if mbstate_t exists in wchar.h. */
+#define _GLIBCXX_HAVE_MBSTATE_T 1
+
+/* Define to 1 if you have the `memalign' function. */
+#define _GLIBCXX_HAVE_MEMALIGN 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define _GLIBCXX_HAVE_MEMORY_H 1
+
+/* Define to 1 if you have the `modf' function. */
+#define _GLIBCXX_HAVE_MODF 1
+
+/* Define to 1 if you have the `modff' function. */
+#define _GLIBCXX_HAVE_MODFF 1
+
+/* Define to 1 if you have the `modfl' function. */
+#define _GLIBCXX_HAVE_MODFL 1
+
+/* Define to 1 if you have the <nan.h> header file. */
+/* #undef _GLIBCXX_HAVE_NAN_H */
+
+/* Define to 1 if you have the <netdb.h> header file. */
+#define _GLIBCXX_HAVE_NETDB_H 1
+
+/* Define to 1 if you have the <netinet/in.h> header file. */
+#define _GLIBCXX_HAVE_NETINET_IN_H 1
+
+/* Define to 1 if you have the <netinet/tcp.h> header file. */
+#define _GLIBCXX_HAVE_NETINET_TCP_H 1
+
+/* Define if <math.h> defines obsolete isinf function. */
+/* #undef _GLIBCXX_HAVE_OBSOLETE_ISINF */
+
+/* Define if <math.h> defines obsolete isnan function. */
+/* #undef _GLIBCXX_HAVE_OBSOLETE_ISNAN */
+
+/* Define if poll is available in <poll.h>. */
+#define _GLIBCXX_HAVE_POLL 1
+
+/* Define to 1 if you have the <poll.h> header file. */
+#define _GLIBCXX_HAVE_POLL_H 1
+
+/* Define to 1 if you have the `posix_memalign' function. */
+#define _GLIBCXX_HAVE_POSIX_MEMALIGN 1
+
+/* Define to 1 if you have the `powf' function. */
+#define _GLIBCXX_HAVE_POWF 1
+
+/* Define to 1 if you have the `powl' function. */
+#define _GLIBCXX_HAVE_POWL 1
+
+/* Define to 1 if you have the `qfpclass' function. */
+/* #undef _GLIBCXX_HAVE_QFPCLASS */
+
+/* Define to 1 if you have the `quick_exit' function. */
+#define _GLIBCXX_HAVE_QUICK_EXIT 1
+
+/* Define if readlink is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_READLINK 1
+
+/* Define to 1 if you have the `setenv' function. */
+#define _GLIBCXX_HAVE_SETENV 1
+
+/* Define to 1 if you have the `sincos' function. */
+#define _GLIBCXX_HAVE_SINCOS 1
+
+/* Define to 1 if you have the `sincosf' function. */
+#define _GLIBCXX_HAVE_SINCOSF 1
+
+/* Define to 1 if you have the `sincosl' function. */
+#define _GLIBCXX_HAVE_SINCOSL 1
+
+/* Define to 1 if you have the `sinf' function. */
+#define _GLIBCXX_HAVE_SINF 1
+
+/* Define to 1 if you have the `sinhf' function. */
+#define _GLIBCXX_HAVE_SINHF 1
+
+/* Define to 1 if you have the `sinhl' function. */
+#define _GLIBCXX_HAVE_SINHL 1
+
+/* Define to 1 if you have the `sinl' function. */
+#define _GLIBCXX_HAVE_SINL 1
+
+/* Defined if sleep exists. */
+/* #undef _GLIBCXX_HAVE_SLEEP */
+
+/* Define to 1 if you have the `sockatmark' function. */
+#define _GLIBCXX_HAVE_SOCKATMARK 1
+
+/* Define to 1 if you have the `sqrtf' function. */
+#define _GLIBCXX_HAVE_SQRTF 1
+
+/* Define to 1 if you have the `sqrtl' function. */
+#define _GLIBCXX_HAVE_SQRTL 1
+
+/* Define to 1 if you have the <stdalign.h> header file. */
+#define _GLIBCXX_HAVE_STDALIGN_H 1
+
+/* Define to 1 if you have the <stdbool.h> header file. */
+#define _GLIBCXX_HAVE_STDBOOL_H 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define _GLIBCXX_HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define _GLIBCXX_HAVE_STDLIB_H 1
+
+/* Define if strerror_l is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRERROR_L 1
+
+/* Define if strerror_r is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRERROR_R 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#define _GLIBCXX_HAVE_STRINGS_H 1
+
+/* Define to 1 if you have the <string.h> header file. */
+#define _GLIBCXX_HAVE_STRING_H 1
+
+/* Define to 1 if you have the `strtof' function. */
+#define _GLIBCXX_HAVE_STRTOF 1
+
+/* Define to 1 if you have the `strtold' function. */
+#define _GLIBCXX_HAVE_STRTOLD 1
+
+/* Define to 1 if `d_type' is a member of `struct dirent'. */
+#define _GLIBCXX_HAVE_STRUCT_DIRENT_D_TYPE 1
+
+/* Define if strxfrm_l is available in <string.h>. */
+#define _GLIBCXX_HAVE_STRXFRM_L 1
+
+/* Define if symlink is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_SYMLINK 1
+
+/* Define to 1 if the target runtime linker supports binding the same symbol
+   to different versions. */
+#define _GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT 1
+
+/* Define to 1 if you have the <sys/filio.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_FILIO_H */
+
+/* Define to 1 if you have the <sys/ioctl.h> header file. */
+#define _GLIBCXX_HAVE_SYS_IOCTL_H 1
+
+/* Define to 1 if you have the <sys/ipc.h> header file. */
+#define _GLIBCXX_HAVE_SYS_IPC_H 1
+
+/* Define to 1 if you have the <sys/isa_defs.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_ISA_DEFS_H */
+
+/* Define to 1 if you have the <sys/machine.h> header file. */
+/* #undef _GLIBCXX_HAVE_SYS_MACHINE_H */
+
+/* Define to 1 if you have the <sys/param.h> header file. */
+#define _GLIBCXX_HAVE_SYS_PARAM_H 1
+
+/* Define to 1 if you have the <sys/resource.h> header file. */
+#define _GLIBCXX_HAVE_SYS_RESOURCE_H 1
+
+/* Define to 1 if you have a suitable <sys/sdt.h> header file */
+#define _GLIBCXX_HAVE_SYS_SDT_H 1
+
+/* Define to 1 if you have the <sys/sem.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SEM_H 1
+
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SOCKET_H 1
+
+/* Define to 1 if you have the <sys/statvfs.h> header file. */
+#define _GLIBCXX_HAVE_SYS_STATVFS_H 1
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define _GLIBCXX_HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/sysinfo.h> header file. */
+#define _GLIBCXX_HAVE_SYS_SYSINFO_H 1
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#define _GLIBCXX_HAVE_SYS_TIME_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define _GLIBCXX_HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if you have the <sys/uio.h> header file. */
+#define _GLIBCXX_HAVE_SYS_UIO_H 1
+
+/* Define if S_IFREG is available in <sys/stat.h>. */
+/* #undef _GLIBCXX_HAVE_S_IFREG */
+
+/* Define if S_ISREG is available in <sys/stat.h>. */
+#define _GLIBCXX_HAVE_S_ISREG 1
+
+/* Define to 1 if you have the `tanf' function. */
+#define _GLIBCXX_HAVE_TANF 1
+
+/* Define to 1 if you have the `tanhf' function. */
+#define _GLIBCXX_HAVE_TANHF 1
+
+/* Define to 1 if you have the `tanhl' function. */
+#define _GLIBCXX_HAVE_TANHL 1
+
+/* Define to 1 if you have the `tanl' function. */
+#define _GLIBCXX_HAVE_TANL 1
+
+/* Define to 1 if you have the <tgmath.h> header file. */
+#define _GLIBCXX_HAVE_TGMATH_H 1
+
+/* Define to 1 if you have the `timespec_get' function. */
+#define _GLIBCXX_HAVE_TIMESPEC_GET 1
+
+/* Define to 1 if the target supports thread-local storage. */
+#define _GLIBCXX_HAVE_TLS 1
+
+/* Define if truncate is available in <unistd.h>. */
+#define _GLIBCXX_HAVE_TRUNCATE 1
+
+/* Define to 1 if you have the <uchar.h> header file. */
+#define _GLIBCXX_HAVE_UCHAR_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define _GLIBCXX_HAVE_UNISTD_H 1
+
+/* Define to 1 if you have the `uselocale' function. */
+#define _GLIBCXX_HAVE_USELOCALE 1
+
+/* Defined if usleep exists. */
+/* #undef _GLIBCXX_HAVE_USLEEP */
+
+/* Define to 1 if you have the <utime.h> header file. */
+#define _GLIBCXX_HAVE_UTIME_H 1
+
+/* Defined if vfwscanf exists. */
+#define _GLIBCXX_HAVE_VFWSCANF 1
+
+/* Defined if vswscanf exists. */
+#define _GLIBCXX_HAVE_VSWSCANF 1
+
+/* Defined if vwscanf exists. */
+#define _GLIBCXX_HAVE_VWSCANF 1
+
+/* Define to 1 if you have the <wchar.h> header file. */
+#define _GLIBCXX_HAVE_WCHAR_H 1
+
+/* Defined if wcstof exists. */
+#define _GLIBCXX_HAVE_WCSTOF 1
+
+/* Define to 1 if you have the <wctype.h> header file. */
+#define _GLIBCXX_HAVE_WCTYPE_H 1
+
+/* Defined if Sleep exists. */
+/* #undef _GLIBCXX_HAVE_WIN32_SLEEP */
+
+/* Define if writev is available in <sys/uio.h>. */
+#define _GLIBCXX_HAVE_WRITEV 1
+
+/* Define to 1 if you have the <xlocale.h> header file. */
+/* #undef _GLIBCXX_HAVE_XLOCALE_H */
+
+/* Define to 1 if you have the `_acosf' function. */
+/* #undef _GLIBCXX_HAVE__ACOSF */
+
+/* Define to 1 if you have the `_acosl' function. */
+/* #undef _GLIBCXX_HAVE__ACOSL */
+
+/* Define to 1 if you have the `_aligned_malloc' function. */
+/* #undef _GLIBCXX_HAVE__ALIGNED_MALLOC */
+
+/* Define to 1 if you have the `_asinf' function. */
+/* #undef _GLIBCXX_HAVE__ASINF */
+
+/* Define to 1 if you have the `_asinl' function. */
+/* #undef _GLIBCXX_HAVE__ASINL */
+
+/* Define to 1 if you have the `_atan2f' function. */
+/* #undef _GLIBCXX_HAVE__ATAN2F */
+
+/* Define to 1 if you have the `_atan2l' function. */
+/* #undef _GLIBCXX_HAVE__ATAN2L */
+
+/* Define to 1 if you have the `_atanf' function. */
+/* #undef _GLIBCXX_HAVE__ATANF */
+
+/* Define to 1 if you have the `_atanl' function. */
+/* #undef _GLIBCXX_HAVE__ATANL */
+
+/* Define to 1 if you have the `_ceilf' function. */
+/* #undef _GLIBCXX_HAVE__CEILF */
+
+/* Define to 1 if you have the `_ceill' function. */
+/* #undef _GLIBCXX_HAVE__CEILL */
+
+/* Define to 1 if you have the `_cosf' function. */
+/* #undef _GLIBCXX_HAVE__COSF */
+
+/* Define to 1 if you have the `_coshf' function. */
+/* #undef _GLIBCXX_HAVE__COSHF */
+
+/* Define to 1 if you have the `_coshl' function. */
+/* #undef _GLIBCXX_HAVE__COSHL */
+
+/* Define to 1 if you have the `_cosl' function. */
+/* #undef _GLIBCXX_HAVE__COSL */
+
+/* Define to 1 if you have the `_expf' function. */
+/* #undef _GLIBCXX_HAVE__EXPF */
+
+/* Define to 1 if you have the `_expl' function. */
+/* #undef _GLIBCXX_HAVE__EXPL */
+
+/* Define to 1 if you have the `_fabsf' function. */
+/* #undef _GLIBCXX_HAVE__FABSF */
+
+/* Define to 1 if you have the `_fabsl' function. */
+/* #undef _GLIBCXX_HAVE__FABSL */
+
+/* Define to 1 if you have the `_finite' function. */
+/* #undef _GLIBCXX_HAVE__FINITE */
+
+/* Define to 1 if you have the `_finitef' function. */
+/* #undef _GLIBCXX_HAVE__FINITEF */
+
+/* Define to 1 if you have the `_finitel' function. */
+/* #undef _GLIBCXX_HAVE__FINITEL */
+
+/* Define to 1 if you have the `_floorf' function. */
+/* #undef _GLIBCXX_HAVE__FLOORF */
+
+/* Define to 1 if you have the `_floorl' function. */
+/* #undef _GLIBCXX_HAVE__FLOORL */
+
+/* Define to 1 if you have the `_fmodf' function. */
+/* #undef _GLIBCXX_HAVE__FMODF */
+
+/* Define to 1 if you have the `_fmodl' function. */
+/* #undef _GLIBCXX_HAVE__FMODL */
+
+/* Define to 1 if you have the `_fpclass' function. */
+/* #undef _GLIBCXX_HAVE__FPCLASS */
+
+/* Define to 1 if you have the `_frexpf' function. */
+/* #undef _GLIBCXX_HAVE__FREXPF */
+
+/* Define to 1 if you have the `_frexpl' function. */
+/* #undef _GLIBCXX_HAVE__FREXPL */
+
+/* Define to 1 if you have the `_hypot' function. */
+/* #undef _GLIBCXX_HAVE__HYPOT */
+
+/* Define to 1 if you have the `_hypotf' function. */
+/* #undef _GLIBCXX_HAVE__HYPOTF */
+
+/* Define to 1 if you have the `_hypotl' function. */
+/* #undef _GLIBCXX_HAVE__HYPOTL */
+
+/* Define to 1 if you have the `_isinf' function. */
+/* #undef _GLIBCXX_HAVE__ISINF */
+
+/* Define to 1 if you have the `_isinff' function. */
+/* #undef _GLIBCXX_HAVE__ISINFF */
+
+/* Define to 1 if you have the `_isinfl' function. */
+/* #undef _GLIBCXX_HAVE__ISINFL */
+
+/* Define to 1 if you have the `_isnan' function. */
+/* #undef _GLIBCXX_HAVE__ISNAN */
+
+/* Define to 1 if you have the `_isnanf' function. */
+/* #undef _GLIBCXX_HAVE__ISNANF */
+
+/* Define to 1 if you have the `_isnanl' function. */
+/* #undef _GLIBCXX_HAVE__ISNANL */
+
+/* Define to 1 if you have the `_ldexpf' function. */
+/* #undef _GLIBCXX_HAVE__LDEXPF */
+
+/* Define to 1 if you have the `_ldexpl' function. */
+/* #undef _GLIBCXX_HAVE__LDEXPL */
+
+/* Define to 1 if you have the `_log10f' function. */
+/* #undef _GLIBCXX_HAVE__LOG10F */
+
+/* Define to 1 if you have the `_log10l' function. */
+/* #undef _GLIBCXX_HAVE__LOG10L */
+
+/* Define to 1 if you have the `_logf' function. */
+/* #undef _GLIBCXX_HAVE__LOGF */
+
+/* Define to 1 if you have the `_logl' function. */
+/* #undef _GLIBCXX_HAVE__LOGL */
+
+/* Define to 1 if you have the `_modf' function. */
+/* #undef _GLIBCXX_HAVE__MODF */
+
+/* Define to 1 if you have the `_modff' function. */
+/* #undef _GLIBCXX_HAVE__MODFF */
+
+/* Define to 1 if you have the `_modfl' function. */
+/* #undef _GLIBCXX_HAVE__MODFL */
+
+/* Define to 1 if you have the `_powf' function. */
+/* #undef _GLIBCXX_HAVE__POWF */
+
+/* Define to 1 if you have the `_powl' function. */
+/* #undef _GLIBCXX_HAVE__POWL */
+
+/* Define to 1 if you have the `_qfpclass' function. */
+/* #undef _GLIBCXX_HAVE__QFPCLASS */
+
+/* Define to 1 if you have the `_sincos' function. */
+/* #undef _GLIBCXX_HAVE__SINCOS */
+
+/* Define to 1 if you have the `_sincosf' function. */
+/* #undef _GLIBCXX_HAVE__SINCOSF */
+
+/* Define to 1 if you have the `_sincosl' function. */
+/* #undef _GLIBCXX_HAVE__SINCOSL */
+
+/* Define to 1 if you have the `_sinf' function. */
+/* #undef _GLIBCXX_HAVE__SINF */
+
+/* Define to 1 if you have the `_sinhf' function. */
+/* #undef _GLIBCXX_HAVE__SINHF */
+
+/* Define to 1 if you have the `_sinhl' function. */
+/* #undef _GLIBCXX_HAVE__SINHL */
+
+/* Define to 1 if you have the `_sinl' function. */
+/* #undef _GLIBCXX_HAVE__SINL */
+
+/* Define to 1 if you have the `_sqrtf' function. */
+/* #undef _GLIBCXX_HAVE__SQRTF */
+
+/* Define to 1 if you have the `_sqrtl' function. */
+/* #undef _GLIBCXX_HAVE__SQRTL */
+
+/* Define to 1 if you have the `_tanf' function. */
+/* #undef _GLIBCXX_HAVE__TANF */
+
+/* Define to 1 if you have the `_tanhf' function. */
+/* #undef _GLIBCXX_HAVE__TANHF */
+
+/* Define to 1 if you have the `_tanhl' function. */
+/* #undef _GLIBCXX_HAVE__TANHL */
+
+/* Define to 1 if you have the `_tanl' function. */
+/* #undef _GLIBCXX_HAVE__TANL */
+
+/* Define to 1 if you have the `_wfopen' function. */
+/* #undef _GLIBCXX_HAVE__WFOPEN */
+
+/* Define to 1 if you have the `__cxa_thread_atexit' function. */
+/* #undef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT */
+
+/* Define to 1 if you have the `__cxa_thread_atexit_impl' function. */
+#define _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL 1
+
+/* Define as const if the declaration of iconv() needs const. */
+#define _GLIBCXX_ICONV_CONST 
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#define LT_OBJDIR ".libs/"
+
+/* Defined if no way to sleep is available. */
+/* #undef NO_SLEEP */
+
+/* Name of package */
+/* #undef _GLIBCXX_PACKAGE */
+
+/* Define to the address where bug reports for this package should be sent. */
+#define _GLIBCXX_PACKAGE_BUGREPORT ""
+
+/* Define to the full name of this package. */
+#define _GLIBCXX_PACKAGE_NAME "package-unused"
+
+/* Define to the full name and version of this package. */
+#define _GLIBCXX_PACKAGE_STRING "package-unused version-unused"
+
+/* Define to the one symbol short name of this package. */
+#define _GLIBCXX_PACKAGE_TARNAME "libstdc++"
+
+/* Define to the home page for this package. */
+#define _GLIBCXX_PACKAGE_URL ""
+
+/* Define to the version of this package. */
+#define _GLIBCXX_PACKAGE__GLIBCXX_VERSION "version-unused"
+
+/* The size of `char', as computed by sizeof. */
+/* #undef SIZEOF_CHAR */
+
+/* The size of `int', as computed by sizeof. */
+/* #undef SIZEOF_INT */
+
+/* The size of `long', as computed by sizeof. */
+/* #undef SIZEOF_LONG */
+
+/* The size of `short', as computed by sizeof. */
+/* #undef SIZEOF_SHORT */
+
+/* The size of `void *', as computed by sizeof. */
+/* #undef SIZEOF_VOID_P */
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* Version number of package */
+/* #undef _GLIBCXX_VERSION */
+
+/* Enable large inode numbers on Mac OS X 10.5.  */
+
+#define _GLIBCXX_DARWIN_USE_64_BIT_INODE 1
+
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+/* #undef _GLIBCXX_FILE_OFFSET_BITS */
+
+/* Define if C99 functions in <complex.h> should be used in <complex> for
+   C++11. Using compiler builtins for these functions requires corresponding
+   C99 library functions to be present. */
+#define _GLIBCXX11_USE_C99_COMPLEX 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in <cmath>
+   in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_MATH 1
+
+/* Define if C99 functions or macros in <stdio.h> should be imported in
+   <cstdio> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_STDIO 1
+
+/* Define if C99 functions or macros in <stdlib.h> should be imported in
+   <cstdlib> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_STDLIB 1
+
+/* Define if C99 functions or macros in <wchar.h> should be imported in
+   <cwchar> in namespace std for C++11. */
+#define _GLIBCXX11_USE_C99_WCHAR 1
+
+/* Define if C99 functions in <complex.h> should be used in <complex> for
+   C++98. Using compiler builtins for these functions requires corresponding
+   C99 library functions to be present. */
+#define _GLIBCXX98_USE_C99_COMPLEX 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in <cmath>
+   in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_MATH 1
+
+/* Define if C99 functions or macros in <stdio.h> should be imported in
+   <cstdio> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_STDIO 1
+
+/* Define if C99 functions or macros in <stdlib.h> should be imported in
+   <cstdlib> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_STDLIB 1
+
+/* Define if C99 functions or macros in <wchar.h> should be imported in
+   <cwchar> in namespace std for C++98. */
+#define _GLIBCXX98_USE_C99_WCHAR 1
+
+/* Define if the compiler supports C++11 atomics. */
+#define _GLIBCXX_ATOMIC_BUILTINS 1
+
+/* Define to use concept checking code from the boost libraries. */
+/* #undef _GLIBCXX_CONCEPT_CHECKS */
+
+/* Define to 1 if a fully dynamic basic_string is wanted, 0 to disable,
+   undefined for platform defaults */
+#define _GLIBCXX_FULLY_DYNAMIC_STRING 0
+
+/* Define if gthreads library is available. */
+#define _GLIBCXX_HAS_GTHREADS 1
+
+/* Define to 1 if POSIX Semaphores with sem_timedwait are available in
+   <semaphore.h>. */
+#define _GLIBCXX__GLIBCXX_HAVE_POSIX_SEMAPHORE 1
+
+/* Define to 1 if a full hosted library is built, or 0 if freestanding. */
+#define _GLIBCXX_HOSTED 1
+
+/* Define if compatibility should be provided for alternative 128-bit long
+   double formats. */
+
+/* Define if compatibility should be provided for -mlong-double-64. */
+
+/* Define to the letter to which size_t is mangled. */
+#define _GLIBCXX_MANGLE_SIZE_T m
+
+/* Define if C99 llrint and llround functions are missing from <math.h>. */
+/* #undef _GLIBCXX_NO_C99_ROUNDING_FUNCS */
+
+/* Define if ptrdiff_t is int. */
+/* #undef _GLIBCXX_PTRDIFF_T_IS_INT */
+
+/* Define if using setrlimit to set resource limits during "make check" */
+#define _GLIBCXX_RES_LIMITS 1
+
+/* Define if size_t is unsigned int. */
+/* #undef _GLIBCXX_SIZE_T_IS_UINT */
+
+/* Define to the value of the EOF integer constant. */
+#define _GLIBCXX_STDIO_EOF -1
+
+/* Define to the value of the SEEK_CUR integer constant. */
+#define _GLIBCXX_STDIO_SEEK_CUR 1
+
+/* Define to the value of the SEEK_END integer constant. */
+#define _GLIBCXX_STDIO_SEEK_END 2
+
+/* Define to use symbol versioning in the shared library. */
+#define _GLIBCXX_SYMVER 1
+
+/* Define to use darwin versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_DARWIN */
+
+/* Define to use GNU versioning in the shared library. */
+#define _GLIBCXX_SYMVER_GNU 1
+
+/* Define to use GNU namespace versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_GNU_NAMESPACE */
+
+/* Define to use Sun versioning in the shared library. */
+/* #undef _GLIBCXX_SYMVER_SUN */
+
+/* Define if C11 functions in <uchar.h> should be imported into namespace std
+   in <cuchar>. */
+#define _GLIBCXX_USE_C11_UCHAR_CXX11 1
+
+/* Define if C99 functions or macros from <wchar.h>, <math.h>, <complex.h>,
+   <stdio.h>, and <stdlib.h> can be used or exposed. */
+#define _GLIBCXX_USE_C99 1
+
+/* Define if C99 functions in <complex.h> should be used in <tr1/complex>.
+   Using compiler builtins for these functions requires corresponding C99
+   library functions to be present. */
+#define _GLIBCXX_USE_C99_COMPLEX_TR1 1
+
+/* Define if C99 functions in <ctype.h> should be imported in <tr1/cctype> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_CTYPE_TR1 1
+
+/* Define if C99 functions in <fenv.h> should be imported in <tr1/cfenv> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_FENV_TR1 1
+
+/* Define if C99 functions in <inttypes.h> should be imported in
+   <tr1/cinttypes> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_INTTYPES_TR1 1
+
+/* Define if wchar_t C99 functions in <inttypes.h> should be imported in
+   <tr1/cinttypes> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1 1
+
+/* Define if C99 functions or macros in <math.h> should be imported in
+   <tr1/cmath> in namespace std::tr1. */
+#define _GLIBCXX_USE_C99_MATH_TR1 1
+
+/* Define if C99 types in <stdint.h> should be imported in <tr1/cstdint> in
+   namespace std::tr1. */
+#define _GLIBCXX_USE_C99_STDINT_TR1 1
+
+/* Defined if clock_gettime syscall has monotonic and realtime clock support.
+   */
+/* #undef _GLIBCXX_USE_CLOCK_GETTIME_SYSCALL */
+
+/* Defined if clock_gettime has monotonic clock support. */
+#define _GLIBCXX_USE_CLOCK_MONOTONIC 1
+
+/* Defined if clock_gettime has realtime clock support. */
+#define _GLIBCXX_USE_CLOCK_REALTIME 1
+
+/* Define if ISO/IEC TR 24733 decimal floating point types are supported on
+   this host. */
+#define _GLIBCXX_USE_DECIMAL_FLOAT 1
+
+/* Define if /dev/random and /dev/urandom are available for
+   std::random_device. */
+#define _GLIBCXX_USE_DEV_RANDOM 1
+
+/* Define if fchmod is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_FCHMOD 1
+
+/* Define if fchmodat is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_FCHMODAT 1
+
+/* Defined if gettimeofday is available. */
+#define _GLIBCXX_USE_GETTIMEOFDAY 1
+
+/* Define if get_nprocs is available in <sys/sysinfo.h>. */
+#define _GLIBCXX_USE_GET_NPROCS 1
+
+/* Define if __int128 is supported on this host. */
+#define _GLIBCXX_USE_INT128 1
+
+/* Define if LFS support is available. */
+#define _GLIBCXX_USE_LFS 1
+
+/* Define if code specialized for long long should be used. */
+#define _GLIBCXX_USE_LONG_LONG 1
+
+/* Define if lstat is available in <sys/stat.h>. */
+#define _GLIBCXX_USE_LSTAT 1
+
+/* Defined if nanosleep is available. */
+#define _GLIBCXX_USE_NANOSLEEP 1
+
+/* Define if NLS translations are to be used. */
+#define _GLIBCXX_USE_NLS 1
+
+/* Define if pthreads_num_processors_np is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP */
+
+/* Define if pthread_cond_clockwait is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT */
+
+/* Define if pthread_mutex_clocklock is available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK */
+
+/* Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are
+   available in <pthread.h>. */
+/* #undef _GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK */
+
+/* Define if POSIX read/write locks are available in <gthr.h>. */
+#define _GLIBCXX_USE_PTHREAD_RWLOCK_T 1
+
+/* Define if /dev/random and /dev/urandom are available for the random_device
+   of TR1 (Chapter 5.1). */
+#define _GLIBCXX_USE_RANDOM_TR1 1
+
+/* Define if usable realpath is available in <stdlib.h>. */
+#define _GLIBCXX_USE_REALPATH 1
+
+/* Defined if sched_yield is available. */
+#define _GLIBCXX_USE_SCHED_YIELD 1
+
+/* Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>. */
+#define _GLIBCXX_USE_SC_NPROCESSORS_ONLN 1
+
+/* Define if _SC_NPROC_ONLN is available in <unistd.h>. */
+/* #undef _GLIBCXX_USE_SC_NPROC_ONLN */
+
+/* Define if sendfile is available in <sys/sendfile.h>. */
+#define _GLIBCXX_USE_SENDFILE 1
+
+/* Define to restrict std::__basic_file<> to stdio APIs. */
+/* #undef _GLIBCXX_USE_STDIO_PURE */
+
+/* Define if struct stat has timespec members. */
+#define _GLIBCXX_USE_ST_MTIM 1
+
+/* Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>. */
+/* #undef _GLIBCXX_USE_SYSCTL_HW_NCPU */
+
+/* Define if obsolescent tmpnam is available in <stdio.h>. */
+#define _GLIBCXX_USE_TMPNAM 1
+
+/* Define if utime is available in <utime.h>. */
+#define _GLIBCXX_USE_UTIME 1
+
+/* Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and
+   AT_FDCWD in <fcntl.h>. */
+#define _GLIBCXX_USE_UTIMENSAT 1
+
+/* Define if code specialized for wchar_t should be used. */
+#define _GLIBCXX_USE_WCHAR_T 1
+
+/* Define to 1 if a verbose library is built, or 0 otherwise. */
+#define _GLIBCXX_VERBOSE 1
+
+/* Defined if as can handle rdrand. */
+#define _GLIBCXX_X86_RDRAND 1
+
+/* Defined if as can handle rdseed. */
+#define _GLIBCXX_X86_RDSEED 1
+
+/* Define to 1 if mutex_timedlock is available. */
+#define _GTHREAD_USE_MUTEX_TIMEDLOCK 1
+
+/* Define for large files, on AIX-style hosts. */
+/* #undef _GLIBCXX_LARGE_FILES */
+
+/* Define if all C++11 floating point overloads are available in <math.h>.  */
+
+/* #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP */
+
+
+/* Define if all C++11 integral type overloads are available in <math.h>.  */
+
+/* #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT */
+
+
+
+
+
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+
+
+
+
+
+
+
+
+// Output streams -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/ostream
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.6.2  Output streams
+//
+
+
+#define _GLIBCXX_OSTREAM 1
+
+       
+
+// Iostreams base classes -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/ios
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.4  Iostreams base classes
+//
+
+
+#define _GLIBCXX_IOS 1
+
+       
+
+// <iosfwd> Forward declarations -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/iosfwd
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.2  Forward declarations
+//
+
+
+#define _GLIBCXX_IOSFWD 1
+
+       
+
+
+// <string> Forward declarations -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/stringfwd.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{string}
+ */
+
+//
+// ISO C++ 14882: 21 Strings library
+//
+
+
+#define _STRINGFWD_H 1
+
+       
+
+
+// <memory> Forward declarations -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ * Copyright (c) 1996-1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/memoryfwd.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{memory}
+ */
+
+
+#define _MEMORYFWD_H 1
+
+       
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * @defgroup allocators Allocators
+   * @ingroup memory
+   *
+   * Classes encapsulating memory operations.
+   *
+   * @{
+   */
+
+  template<typename>
+    class allocator;
+
+
+  template<>
+    class allocator<void>;
+
+
+
+  /// Declare uses_allocator so it can be specialized in \<queue\> etc.
+  template<typename, typename>
+    struct uses_allocator;
+
+
+  /// @} group memory
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @defgroup strings Strings
+   *
+   *  @{
+  */
+
+  template<class _CharT>
+    struct char_traits;
+
+  template<> struct char_traits<char>;
+
+
+  template<> struct char_traits<wchar_t>;
+
+
+
+
+
+
+
+  template<> struct char_traits<char16_t>;
+  template<> struct char_traits<char32_t>;
+
+
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT>,
+           typename _Alloc = allocator<_CharT> >
+    class basic_string;
+
+_GLIBCXX_END_NAMESPACE_CXX11
+
+  /// A string of @c char
+  typedef basic_string<char>    string;   
+
+
+  /// A string of @c wchar_t
+  typedef basic_string<wchar_t> wstring;   
+
+
+
+
+
+
+
+
+  /// A string of @c char16_t
+  typedef basic_string<char16_t> u16string; 
+
+  /// A string of @c char32_t
+  typedef basic_string<char32_t> u32string; 
+
+
+  /** @}  */
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+// Position types -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/postypes.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+//
+// ISO C++ 14882: 27.4.1 - Types
+// ISO C++ 14882: 27.4.3 - Template class fpos
+//
+
+
+#define _GLIBCXX_POSTYPES_H 1
+
+       
+
+// -*- C++ -*- forwarding header.
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/cwchar
+ *  This is a Standard C++ Library file.  You should @c \#include this file
+ *  in your programs, rather than any of the @a *.h implementation files.
+ *
+ *  This is the C++ version of the Standard C Library header @c wchar.h,
+ *  and its contents are (mostly) the same as that header, but are all
+ *  contained in the namespace @c std (except for names which are defined
+ *  as macros in C).
+ */
+
+//
+// ISO C++ 14882: 21.4
+//
+
+       
+
+
+
+
+/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ *      ISO C99 Standard: 7.24
+ *	Extended multibyte and wide character utilities	<wchar.h>
+ */
+
+
+#define _WCHAR_H 1
+
+#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION 
+/* Handle feature test macros at the start of a header.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header is internal to glibc and should not be included outside
+   of glibc headers.  Headers including it must define
+   __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first.  This header
+   cannot have multiple include guards because ISO C feature test
+   macros depend on the definition of the macro when an affected
+   header is included, not when the first system header is
+   included.  */
+
+
+
+
+
+#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+
+
+
+/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
+   macro.  */
+#undef __GLIBC_USE_LIB_EXT2
+
+
+#define __GLIBC_USE_LIB_EXT2 1
+
+
+
+
+/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
+   macro.  */
+#undef __GLIBC_USE_IEC_60559_BFP_EXT
+
+#define __GLIBC_USE_IEC_60559_BFP_EXT 1
+
+
+
+
+/* ISO/IEC TS 18661-4:2015 defines the
+   __STDC_WANT_IEC_60559_FUNCS_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
+
+#define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
+
+
+
+
+/* ISO/IEC TS 18661-3:2015 defines the
+   __STDC_WANT_IEC_60559_TYPES_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_TYPES_EXT
+
+#define __GLIBC_USE_IEC_60559_TYPES_EXT 1
+
+/* Gather machine dependent type support.  */
+/* Macros to control TS 18661-3 glibc features on x86.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_FLOATN_H 
+
+
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the IEEE 754 binary128 format, and this
+   glibc includes corresponding *f128 interfaces for it.  The required
+   libgcc support was added some time after the basic compiler
+   support, for x86_64 and x86.  */
+
+
+
+#define __HAVE_FLOAT128 1
+
+
+
+
+/* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct
+   from the default float, double and long double types in this glibc.  */
+
+#define __HAVE_DISTINCT_FLOAT128 1
+
+
+
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the right format for _Float64x, and this
+   glibc includes corresponding *f64x interfaces for it.  */
+#define __HAVE_FLOAT64X 1
+
+/* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format
+   of long double.  Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has
+   the format of _Float128, which must be different from that of long
+   double.  */
+#define __HAVE_FLOAT64X_LONG_DOUBLE 1
+
+
+
+/* Defined to concatenate the literal suffix to be used with _Float128
+   types, if __HAVE_FLOAT128 is 1. */
+
+
+/* The literal suffix f128 exists only since GCC 7.0.  */
+#define __f128(x) x ##q
+
+
+
+
+
+/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1.  */
+
+
+/* Add a typedef for older GCC compilers which don't natively support
+   _Complex _Float128.  */
+typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
+#define __CFLOAT128 __cfloat128
+
+
+
+
+
+/* The remaining of this file provides support for older compilers.  */
+
+
+/* The type _Float128 exists only since GCC 7.0.  */
+
+typedef __float128 _Float128;
+
+
+/* __builtin_huge_valf128 doesn't exist before GCC 7.0.  */
+
+
+
+
+/* Older GCC has only a subset of built-in functions for _Float128 on
+   x86, and __builtin_infq is not usable in static initializers.
+   Converting a narrower sNaN to _Float128 produces a quiet NaN, so
+   attempts to use _Float128 sNaNs will not work properly with older
+   compilers.  */
+
+
+
+
+
+
+
+
+/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
+   e.g.: __builtin_signbitf128, before GCC 6.  However, there has never
+   been a __builtin_signbitf128 in GCC and the type-generic builtin is
+   only available since GCC 6.  */
+
+
+
+
+
+
+
+
+/* Macros to control TS 18661-3 glibc features where the same
+   definitions are appropriate for all platforms.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_FLOATN_COMMON_H 
+
+
+/* Properties of long double type.  ldbl-96 version.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */
+
+/* This header should be included at the bottom of each bits/floatn.h.
+   It defines the following macros for each _FloatN and _FloatNx type,
+   where the same definitions, or definitions based only on the macros
+   in bits/floatn.h, are appropriate for all glibc configurations.  */
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the right format for this type, and this
+   glibc includes corresponding *fN or *fNx interfaces for it.  */
+#define __HAVE_FLOAT16 0
+#define __HAVE_FLOAT32 1
+#define __HAVE_FLOAT64 1
+#define __HAVE_FLOAT32X 1
+#define __HAVE_FLOAT128X 0
+
+/* Defined to 1 if the corresponding __HAVE_<type> macro is 1 and the
+   type is the first with its format in the sequence of (the default
+   choices for) float, double, long double, _Float16, _Float32,
+   _Float64, _Float128, _Float32x, _Float64x, _Float128x for this
+   glibc; that is, if functions present once per floating-point format
+   rather than once per type are present for this type.
+
+   All configurations supported by glibc have _Float32 the same format
+   as float, _Float64 and _Float32x the same format as double, the
+   _Float64x the same format as either long double or _Float128.  No
+   configurations support _Float128x or, as of GCC 7, have compiler
+   support for a type meeting the requirements for _Float128x.  */
+#define __HAVE_DISTINCT_FLOAT16 __HAVE_FLOAT16
+#define __HAVE_DISTINCT_FLOAT32 0
+#define __HAVE_DISTINCT_FLOAT64 0
+#define __HAVE_DISTINCT_FLOAT32X 0
+#define __HAVE_DISTINCT_FLOAT64X 0
+#define __HAVE_DISTINCT_FLOAT128X __HAVE_FLOAT128X
+
+/* Defined to 1 if the corresponding _FloatN type is not binary compatible
+   with the corresponding ISO C type in the current compilation unit as
+   opposed to __HAVE_DISTINCT_FLOATN, which indicates the default types built
+   in glibc.  */
+#define __HAVE_FLOAT128_UNLIKE_LDBL (__HAVE_DISTINCT_FLOAT128 && __LDBL_MANT_DIG__ != 113)
+
+
+/* Defined to 1 if any _FloatN or _FloatNx types that are not
+   ABI-distinct are however distinct types at the C language level (so
+   for the purposes of __builtin_types_compatible_p and _Generic).  */
+
+
+
+#define __HAVE_FLOATN_NOT_TYPEDEF 0
+
+
+
+
+/* Defined to concatenate the literal suffix to be used with _FloatN
+   or _FloatNx types, if __HAVE_<type> is 1.  The corresponding
+   literal suffixes exist since GCC 7, for C only.  */
+
+
+
+#define __f32(x) x ##f
+
+
+
+
+
+
+
+
+
+
+#define __f64(x) x
+
+
+
+
+
+
+
+
+#define __f32x(x) x
+
+
+
+
+
+
+
+
+#define __f64x(x) x ##l
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* Defined to a complex type if __HAVE_<type> is 1.  */
+
+
+
+#define __CFLOAT32 _Complex float
+
+
+
+
+
+
+
+
+
+
+#define __CFLOAT64 _Complex double
+
+
+
+
+
+
+
+
+#define __CFLOAT32X _Complex double
+
+
+
+
+
+
+
+
+#define __CFLOAT64X _Complex long double
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* The remaining of this file provides support for older compilers.  */
+
+
+
+
+typedef float _Float32;
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* If double, long double and _Float64 all have the same set of
+   values, TS 18661-3 requires the usual arithmetic conversions on
+   long double and _Float64 to produce _Float64.  For this to be the
+   case when building with a compiler without a distinct _Float64
+   type, _Float64 must be a typedef for long double, not for
+   double.  */
+
+
+
+typedef double _Float64;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+typedef double _Float32x;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+typedef long double _Float64x;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#define __need_size_t 
+#define __need_wchar_t 
+#define __need_NULL 
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+
+
+
+
+
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+
+
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+
+
+
+
+
+
+
+
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+
+
+
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#define __size_t__ 
+#define __SIZE_T__ 
+#define _SIZE_T 
+#define _SYS_SIZE_T_H 
+#define _T_SIZE_ 
+#define _T_SIZE 
+#define __SIZE_T 
+#define _SIZE_T_ 
+#define _BSD_SIZE_T_ 
+#define _SIZE_T_DEFINED_ 
+#define _SIZE_T_DEFINED 
+#define _BSD_SIZE_T_DEFINED_ 
+#define _SIZE_T_DECLARED 
+#define ___int_size_t_h 
+#define _GCC_SIZE_T 
+#define _SIZET_ 
+
+
+
+
+
+
+#define __size_t 
+
+
+
+
+
+typedef __SIZE_TYPE__ size_t;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#undef __need_size_t
+
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#define __wchar_t__ 
+#define __WCHAR_T__ 
+#define _WCHAR_T 
+#define _T_WCHAR_ 
+#define _T_WCHAR 
+#define __WCHAR_T 
+#define _WCHAR_T_ 
+#define _BSD_WCHAR_T_ 
+#define _WCHAR_T_DEFINED_ 
+#define _WCHAR_T_DEFINED 
+#define _WCHAR_T_H 
+#define ___int_wchar_t_h 
+#define __INT_WCHAR_T_H 
+#define _GCC_WCHAR_T 
+#define _WCHAR_T_DECLARED 
+
+/* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
+   instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
+   symbols in the _FOO_T_ family, stays defined even after its
+   corresponding type is defined).  If we define wchar_t, then we
+   must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
+   we undef _WCHAR_T_, then we must also define rune_t, since 
+   headers like runetype.h assume that if machine/ansi.h is included,
+   and _BSD_WCHAR_T_ is not defined, then rune_t is available.
+   machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
+   the same type." */
+
+#undef _BSD_WCHAR_T_
+
+/* FreeBSD 5 can't be handled well using "traditional" logic above
+   since it no longer defines _BSD_RUNE_T_ yet still desires to export
+   rune_t in some cases... */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#undef __need_wchar_t
+
+
+
+
+
+
+/* A null pointer constant.  */
+
+
+#undef NULL
+
+#define NULL __null
+
+
+
+
+
+
+
+
+#undef __need_NULL
+
+
+
+#define __need___va_list 
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.15  Variable arguments  <stdarg.h>
+ */
+
+
+
+
+
+
+
+#undef __need___va_list
+
+/* Define __gnuc_va_list.  */
+
+
+#define __GNUC_VA_LIST 
+typedef __builtin_va_list __gnuc_va_list;
+
+
+/* Define the standard macros for the user,
+   if this invocation was from the user program.  */
+
+
+
+/* wchar_t type related definitions.
+   Copyright (C) 2000-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_WCHAR_H 1
+
+/* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__
+   are not defined, give the right value and type as long as both int
+   and wchar_t are 32-bit types.  Adding L'\0' to a constant value
+   ensures that the type is correct; it is necessary to use (L'\0' +
+   0) rather than just L'\0' so that the type in C++ is the promoted
+   version of wchar_t rather than the distinct wchar_t type itself.
+   Because wchar_t in preprocessor #if expressions is treated as
+   intmax_t or uintmax_t, the expression (L'\0' - 1) would have the
+   wrong value for WCHAR_MAX in such expressions and so cannot be used
+   to define __WCHAR_MAX in the unsigned case.  */
+
+
+#define __WCHAR_MAX __WCHAR_MAX__
+
+
+
+
+
+
+
+#define __WCHAR_MIN __WCHAR_MIN__
+
+
+
+
+
+
+
+#define __wint_t_defined 1
+
+/* Some versions of stddef.h provide wint_t, even though neither the
+   C nor C++ standards, nor POSIX, specifies this.  We assume that
+   stddef.h will define the macro _WINT_T if and only if it provides
+   wint_t, and conversely, that it will avoid providing wint_t if
+   _WINT_T is already defined.  */
+
+#define _WINT_T 1
+
+/* Integral type unchanged by default argument promotions that can
+   hold any value corresponding to members of the extended character
+   set, as well as at least one value that does not correspond to any
+   member of the extended character set.  */
+
+
+
+
+typedef __WINT_TYPE__ wint_t;
+
+
+
+#define __mbstate_t_defined 1
+
+
+#define ____mbstate_t_defined 1
+
+/* Integral type unchanged by default argument promotions that can
+   hold any value corresponding to members of the extended character
+   set, as well as at least one value that does not correspond to any
+   member of the extended character set.  */
+
+
+
+
+/* Conversion state information.  */
+typedef struct
+{
+  int __count;
+  union
+  {
+    __WINT_TYPE__ __wch;
+    char __wchb[4];
+  } __value;		/* Value so far.  */
+} __mbstate_t;
+
+
+typedef __mbstate_t mbstate_t;
+
+
+#define ____FILE_defined 1
+
+struct _IO_FILE;
+typedef struct _IO_FILE __FILE;
+
+
+
+
+#define __FILE_defined 1
+
+struct _IO_FILE;
+
+/* The opaque type of streams.  This is the definition used elsewhere.  */
+typedef struct _IO_FILE FILE;
+
+
+
+/* Definition of locale_t.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_TYPES_LOCALE_T_H 1
+
+/* Definition of struct __locale_struct and __locale_t.
+   Copyright (C) 1997-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_TYPES___LOCALE_T_H 1
+
+/* POSIX.1-2008: the locale_t type, representing a locale context
+   (implementation-namespace version).  This type should be treated
+   as opaque by applications; some details are exposed for the sake of
+   efficiency in e.g. ctype functions.  */
+
+struct __locale_struct
+{
+  /* Note: LC_ALL is not a valid index into this array.  */
+  struct __locale_data *__locales[13]; /* 13 = __LC_LAST. */
+
+  /* To increase the speed of this solution we add some special members.  */
+  const unsigned short int *__ctype_b;
+  const int *__ctype_tolower;
+  const int *__ctype_toupper;
+
+  /* Note: LC_ALL is not a valid index into this array.  */
+  const char *__names[13];
+};
+
+typedef struct __locale_struct *__locale_t;
+
+
+typedef __locale_t locale_t;
+
+
+
+/* Tell the caller that we provide correct C++ prototypes.  */
+
+#define __CORRECT_ISO_CPP_WCHAR_H_PROTO 
+
+
+
+/* These constants might also be defined in <inttypes.h>.  */
+#define WCHAR_MIN __WCHAR_MIN
+#define WCHAR_MAX __WCHAR_MAX
+
+
+
+#define WEOF (0xffffffffu)
+
+
+/* All versions of XPG prior to the publication of ISO C99 required
+   the bulk of <wctype.h>'s declarations to appear in this header
+   (because <wctype.h> did not exist prior to C99).  In POSIX.1-2001
+   those declarations were marked as XSI extensions; in -2008 they
+   were additionally marked as obsolescent.  _GNU_SOURCE mode
+   anticipates the removal of these declarations in the next revision
+   of POSIX.  */
+
+
+
+
+
+__BEGIN_DECLS
+
+/* This incomplete type is defined in <time.h> but needed here because
+   of `wcsftime'.  */
+struct tm;
+
+
+/* Copy SRC to DEST.  */
+extern wchar_t *wcscpy (wchar_t *__restrict __dest,
+			const wchar_t *__restrict __src)
+     __THROW __nonnull ((1, 2));
+
+/* Copy no more than N wide-characters of SRC to DEST.  */
+extern wchar_t *wcsncpy (wchar_t *__restrict __dest,
+			 const wchar_t *__restrict __src, size_t __n)
+     __THROW __nonnull ((1, 2));
+
+/* Append SRC onto DEST.  */
+extern wchar_t *wcscat (wchar_t *__restrict __dest,
+			const wchar_t *__restrict __src)
+     __THROW __nonnull ((1, 2));
+/* Append no more than N wide-characters of SRC onto DEST.  */
+extern wchar_t *wcsncat (wchar_t *__restrict __dest,
+			 const wchar_t *__restrict __src, size_t __n)
+     __THROW __nonnull ((1, 2));
+
+/* Compare S1 and S2.  */
+extern int wcscmp (const wchar_t *__s1, const wchar_t *__s2)
+     __THROW __attribute_pure__ __nonnull ((1, 2));
+/* Compare N wide-characters of S1 and S2.  */
+extern int wcsncmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
+     __THROW __attribute_pure__ __nonnull ((1, 2));
+
+
+/* Compare S1 and S2, ignoring case.  */
+extern int wcscasecmp (const wchar_t *__s1, const wchar_t *__s2) __THROW;
+
+/* Compare no more than N chars of S1 and S2, ignoring case.  */
+extern int wcsncasecmp (const wchar_t *__s1, const wchar_t *__s2,
+			size_t __n) __THROW;
+
+/* Similar to the two functions above but take the information from
+   the provided locale and not the global locale.  */
+extern int wcscasecmp_l (const wchar_t *__s1, const wchar_t *__s2,
+			 locale_t __loc) __THROW;
+
+extern int wcsncasecmp_l (const wchar_t *__s1, const wchar_t *__s2,
+			  size_t __n, locale_t __loc) __THROW;
+
+
+/* Compare S1 and S2, both interpreted as appropriate to the
+   LC_COLLATE category of the current locale.  */
+extern int wcscoll (const wchar_t *__s1, const wchar_t *__s2) __THROW;
+/* Transform S2 into array pointed to by S1 such that if wcscmp is
+   applied to two transformed strings the result is the as applying
+   `wcscoll' to the original strings.  */
+extern size_t wcsxfrm (wchar_t *__restrict __s1,
+		       const wchar_t *__restrict __s2, size_t __n) __THROW;
+
+
+/* Similar to the two functions above but take the information from
+   the provided locale and not the global locale.  */
+
+/* Compare S1 and S2, both interpreted as appropriate to the
+   LC_COLLATE category of the given locale.  */
+extern int wcscoll_l (const wchar_t *__s1, const wchar_t *__s2,
+		      locale_t __loc) __THROW;
+
+/* Transform S2 into array pointed to by S1 such that if wcscmp is
+   applied to two transformed strings the result is the as applying
+   `wcscoll' to the original strings.  */
+extern size_t wcsxfrm_l (wchar_t *__s1, const wchar_t *__s2,
+			 size_t __n, locale_t __loc) __THROW;
+
+/* Duplicate S, returning an identical malloc'd string.  */
+extern wchar_t *wcsdup (const wchar_t *__s) __THROW __attribute_malloc__;
+
+
+/* Find the first occurrence of WC in WCS.  */
+
+extern "C++" wchar_t *wcschr (wchar_t *__wcs, wchar_t __wc)
+     __THROW __asm ("wcschr") __attribute_pure__;
+extern "C++" const wchar_t *wcschr (const wchar_t *__wcs, wchar_t __wc)
+     __THROW __asm ("wcschr") __attribute_pure__;
+
+
+
+
+/* Find the last occurrence of WC in WCS.  */
+
+extern "C++" wchar_t *wcsrchr (wchar_t *__wcs, wchar_t __wc)
+     __THROW __asm ("wcsrchr") __attribute_pure__;
+extern "C++" const wchar_t *wcsrchr (const wchar_t *__wcs, wchar_t __wc)
+     __THROW __asm ("wcsrchr") __attribute_pure__;
+
+
+
+
+
+
+/* This function is similar to `wcschr'.  But it returns a pointer to
+   the closing NUL wide character in case C is not found in S.  */
+extern wchar_t *wcschrnul (const wchar_t *__s, wchar_t __wc)
+     __THROW __attribute_pure__;
+
+
+/* Return the length of the initial segmet of WCS which
+   consists entirely of wide characters not in REJECT.  */
+extern size_t wcscspn (const wchar_t *__wcs, const wchar_t *__reject)
+     __THROW __attribute_pure__;
+/* Return the length of the initial segmet of WCS which
+   consists entirely of wide characters in  ACCEPT.  */
+extern size_t wcsspn (const wchar_t *__wcs, const wchar_t *__accept)
+     __THROW __attribute_pure__;
+/* Find the first occurrence in WCS of any character in ACCEPT.  */
+
+extern "C++" wchar_t *wcspbrk (wchar_t *__wcs, const wchar_t *__accept)
+     __THROW __asm ("wcspbrk") __attribute_pure__;
+extern "C++" const wchar_t *wcspbrk (const wchar_t *__wcs,
+				     const wchar_t *__accept)
+     __THROW __asm ("wcspbrk") __attribute_pure__;
+
+
+
+
+/* Find the first occurrence of NEEDLE in HAYSTACK.  */
+
+extern "C++" wchar_t *wcsstr (wchar_t *__haystack, const wchar_t *__needle)
+     __THROW __asm ("wcsstr") __attribute_pure__;
+extern "C++" const wchar_t *wcsstr (const wchar_t *__haystack,
+				    const wchar_t *__needle)
+     __THROW __asm ("wcsstr") __attribute_pure__;
+
+
+
+
+
+/* Divide WCS into tokens separated by characters in DELIM.  */
+extern wchar_t *wcstok (wchar_t *__restrict __s,
+			const wchar_t *__restrict __delim,
+			wchar_t **__restrict __ptr) __THROW;
+
+/* Return the number of wide characters in S.  */
+extern size_t wcslen (const wchar_t *__s) __THROW __attribute_pure__;
+
+
+/* Another name for `wcsstr' from XPG4.  */
+
+extern "C++" wchar_t *wcswcs (wchar_t *__haystack, const wchar_t *__needle)
+     __THROW __asm ("wcswcs") __attribute_pure__;
+extern "C++" const wchar_t *wcswcs (const wchar_t *__haystack,
+				    const wchar_t *__needle)
+     __THROW __asm ("wcswcs") __attribute_pure__;
+
+
+
+
+
+
+
+/* Return the number of wide characters in S, but at most MAXLEN.  */
+extern size_t wcsnlen (const wchar_t *__s, size_t __maxlen)
+     __THROW __attribute_pure__;
+
+
+
+/* Search N wide characters of S for C.  */
+
+extern "C++" wchar_t *wmemchr (wchar_t *__s, wchar_t __c, size_t __n)
+     __THROW __asm ("wmemchr") __attribute_pure__;
+extern "C++" const wchar_t *wmemchr (const wchar_t *__s, wchar_t __c,
+				     size_t __n)
+     __THROW __asm ("wmemchr") __attribute_pure__;
+
+
+
+
+
+/* Compare N wide characters of S1 and S2.  */
+extern int wmemcmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
+     __THROW __attribute_pure__;
+
+/* Copy N wide characters of SRC to DEST.  */
+extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
+			 const wchar_t *__restrict __s2, size_t __n) __THROW;
+
+/* Copy N wide characters of SRC to DEST, guaranteeing
+   correct behavior for overlapping strings.  */
+extern wchar_t *wmemmove (wchar_t *__s1, const wchar_t *__s2, size_t __n)
+     __THROW;
+
+/* Set N wide characters of S to C.  */
+extern wchar_t *wmemset (wchar_t *__s, wchar_t __c, size_t __n) __THROW;
+
+
+/* Copy N wide characters of SRC to DEST and return pointer to following
+   wide character.  */
+extern wchar_t *wmempcpy (wchar_t *__restrict __s1,
+			  const wchar_t *__restrict __s2, size_t __n)
+     __THROW;
+
+
+
+/* Determine whether C constitutes a valid (one-byte) multibyte
+   character.  */
+extern wint_t btowc (int __c) __THROW;
+
+/* Determine whether C corresponds to a member of the extended
+   character set whose multibyte representation is a single byte.  */
+extern int wctob (wint_t __c) __THROW;
+
+/* Determine whether PS points to an object representing the initial
+   state.  */
+extern int mbsinit (const mbstate_t *__ps) __THROW __attribute_pure__;
+
+/* Write wide character representation of multibyte character pointed
+   to by S to PWC.  */
+extern size_t mbrtowc (wchar_t *__restrict __pwc,
+		       const char *__restrict __s, size_t __n,
+		       mbstate_t *__restrict __p) __THROW;
+
+/* Write multibyte representation of wide character WC to S.  */
+extern size_t wcrtomb (char *__restrict __s, wchar_t __wc,
+		       mbstate_t *__restrict __ps) __THROW;
+
+/* Return number of bytes in multibyte character pointed to by S.  */
+extern size_t __mbrlen (const char *__restrict __s, size_t __n,
+			mbstate_t *__restrict __ps) __THROW;
+extern size_t mbrlen (const char *__restrict __s, size_t __n,
+		      mbstate_t *__restrict __ps) __THROW;
+
+
+/* Write wide character representation of multibyte character string
+   SRC to DST.  */
+extern size_t mbsrtowcs (wchar_t *__restrict __dst,
+			 const char **__restrict __src, size_t __len,
+			 mbstate_t *__restrict __ps) __THROW;
+
+/* Write multibyte character representation of wide character string
+   SRC to DST.  */
+extern size_t wcsrtombs (char *__restrict __dst,
+			 const wchar_t **__restrict __src, size_t __len,
+			 mbstate_t *__restrict __ps) __THROW;
+
+
+
+/* Write wide character representation of at most NMC bytes of the
+   multibyte character string SRC to DST.  */
+extern size_t mbsnrtowcs (wchar_t *__restrict __dst,
+			  const char **__restrict __src, size_t __nmc,
+			  size_t __len, mbstate_t *__restrict __ps) __THROW;
+
+/* Write multibyte character representation of at most NWC characters
+   from the wide character string SRC to DST.  */
+extern size_t wcsnrtombs (char *__restrict __dst,
+			  const wchar_t **__restrict __src,
+			  size_t __nwc, size_t __len,
+			  mbstate_t *__restrict __ps) __THROW;
+
+
+
+/* The following functions are extensions found in X/Open CAE.  */
+
+/* Determine number of column positions required for C.  */
+extern int wcwidth (wchar_t __c) __THROW;
+
+/* Determine number of column positions required for first N wide
+   characters (or fewer if S ends before this) in S.  */
+extern int wcswidth (const wchar_t *__s, size_t __n) __THROW;
+
+
+
+/* Convert initial portion of the wide string NPTR to `double'
+   representation.  */
+extern double wcstod (const wchar_t *__restrict __nptr,
+		      wchar_t **__restrict __endptr) __THROW;
+
+
+/* Likewise for `float' and `long double' sizes of floating-point numbers.  */
+extern float wcstof (const wchar_t *__restrict __nptr,
+		     wchar_t **__restrict __endptr) __THROW;
+extern long double wcstold (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr) __THROW;
+
+
+/* Likewise for `_FloatN' and `_FloatNx' when support is enabled.  */
+
+
+
+
+
+
+
+extern _Float32 wcstof32 (const wchar_t *__restrict __nptr,
+			  wchar_t **__restrict __endptr) __THROW;
+
+
+
+extern _Float64 wcstof64 (const wchar_t *__restrict __nptr,
+			  wchar_t **__restrict __endptr) __THROW;
+
+
+
+extern _Float128 wcstof128 (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr) __THROW;
+
+
+
+extern _Float32x wcstof32x (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr) __THROW;
+
+
+
+extern _Float64x wcstof64x (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr) __THROW;
+
+
+
+
+
+
+
+
+/* Convert initial portion of wide string NPTR to `long int'
+   representation.  */
+extern long int wcstol (const wchar_t *__restrict __nptr,
+			wchar_t **__restrict __endptr, int __base) __THROW;
+
+/* Convert initial portion of wide string NPTR to `unsigned long int'
+   representation.  */
+extern unsigned long int wcstoul (const wchar_t *__restrict __nptr,
+				  wchar_t **__restrict __endptr, int __base)
+     __THROW;
+
+
+/* Convert initial portion of wide string NPTR to `long long int'
+   representation.  */
+__extension__
+extern long long int wcstoll (const wchar_t *__restrict __nptr,
+			      wchar_t **__restrict __endptr, int __base)
+     __THROW;
+
+/* Convert initial portion of wide string NPTR to `unsigned long long int'
+   representation.  */
+__extension__
+extern unsigned long long int wcstoull (const wchar_t *__restrict __nptr,
+					wchar_t **__restrict __endptr,
+					int __base) __THROW;
+
+
+
+/* Convert initial portion of wide string NPTR to `long long int'
+   representation.  */
+__extension__
+extern long long int wcstoq (const wchar_t *__restrict __nptr,
+			     wchar_t **__restrict __endptr, int __base)
+     __THROW;
+
+/* Convert initial portion of wide string NPTR to `unsigned long long int'
+   representation.  */
+__extension__
+extern unsigned long long int wcstouq (const wchar_t *__restrict __nptr,
+				       wchar_t **__restrict __endptr,
+				       int __base) __THROW;
+
+
+
+/* Parallel versions of the functions above which take the locale to
+   use as an additional parameter.  These are GNU extensions inspired
+   by the POSIX.1-2008 extended locale API.  */
+extern long int wcstol_l (const wchar_t *__restrict __nptr,
+			  wchar_t **__restrict __endptr, int __base,
+			  locale_t __loc) __THROW;
+
+extern unsigned long int wcstoul_l (const wchar_t *__restrict __nptr,
+				    wchar_t **__restrict __endptr,
+				    int __base, locale_t __loc) __THROW;
+
+__extension__
+extern long long int wcstoll_l (const wchar_t *__restrict __nptr,
+				wchar_t **__restrict __endptr,
+				int __base, locale_t __loc) __THROW;
+
+__extension__
+extern unsigned long long int wcstoull_l (const wchar_t *__restrict __nptr,
+					  wchar_t **__restrict __endptr,
+					  int __base, locale_t __loc)
+     __THROW;
+
+extern double wcstod_l (const wchar_t *__restrict __nptr,
+			wchar_t **__restrict __endptr, locale_t __loc)
+     __THROW;
+
+extern float wcstof_l (const wchar_t *__restrict __nptr,
+		       wchar_t **__restrict __endptr, locale_t __loc)
+     __THROW;
+
+extern long double wcstold_l (const wchar_t *__restrict __nptr,
+			      wchar_t **__restrict __endptr,
+			      locale_t __loc) __THROW;
+
+
+
+
+
+
+
+
+extern _Float32 wcstof32_l (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr,
+			    locale_t __loc) __THROW;
+
+
+
+extern _Float64 wcstof64_l (const wchar_t *__restrict __nptr,
+			    wchar_t **__restrict __endptr,
+			    locale_t __loc) __THROW;
+
+
+
+extern _Float128 wcstof128_l (const wchar_t *__restrict __nptr,
+			      wchar_t **__restrict __endptr,
+			      locale_t __loc) __THROW;
+
+
+
+extern _Float32x wcstof32x_l (const wchar_t *__restrict __nptr,
+			      wchar_t **__restrict __endptr,
+			      locale_t __loc) __THROW;
+
+
+
+extern _Float64x wcstof64x_l (const wchar_t *__restrict __nptr,
+			      wchar_t **__restrict __endptr,
+			      locale_t __loc) __THROW;
+
+
+
+
+
+
+
+
+
+
+
+/* Copy SRC to DEST, returning the address of the terminating L'\0' in
+   DEST.  */
+extern wchar_t *wcpcpy (wchar_t *__restrict __dest,
+			const wchar_t *__restrict __src) __THROW;
+
+/* Copy no more than N characters of SRC to DEST, returning the address of
+   the last character written into DEST.  */
+extern wchar_t *wcpncpy (wchar_t *__restrict __dest,
+			 const wchar_t *__restrict __src, size_t __n)
+     __THROW;
+
+
+
+/* Wide character I/O functions.  */
+
+
+/* Like OPEN_MEMSTREAM, but the stream is wide oriented and produces
+   a wide character string.  */
+extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) __THROW;
+
+
+
+
+/* Select orientation for stream.  */
+extern int fwide (__FILE *__fp, int __mode) __THROW;
+
+
+/* Write formatted output to STREAM.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int fwprintf (__FILE *__restrict __stream,
+		     const wchar_t *__restrict __format, ...)
+     /* __attribute__ ((__format__ (__wprintf__, 2, 3))) */;
+/* Write formatted output to stdout.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int wprintf (const wchar_t *__restrict __format, ...)
+     /* __attribute__ ((__format__ (__wprintf__, 1, 2))) */;
+/* Write formatted output of at most N characters to S.  */
+extern int swprintf (wchar_t *__restrict __s, size_t __n,
+		     const wchar_t *__restrict __format, ...)
+     __THROW /* __attribute__ ((__format__ (__wprintf__, 3, 4))) */;
+
+/* Write formatted output to S from argument list ARG.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int vfwprintf (__FILE *__restrict __s,
+		      const wchar_t *__restrict __format,
+		      __gnuc_va_list __arg)
+     /* __attribute__ ((__format__ (__wprintf__, 2, 0))) */;
+/* Write formatted output to stdout from argument list ARG.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int vwprintf (const wchar_t *__restrict __format,
+		     __gnuc_va_list __arg)
+     /* __attribute__ ((__format__ (__wprintf__, 1, 0))) */;
+/* Write formatted output of at most N character to S from argument
+   list ARG.  */
+extern int vswprintf (wchar_t *__restrict __s, size_t __n,
+		      const wchar_t *__restrict __format,
+		      __gnuc_va_list __arg)
+     __THROW /* __attribute__ ((__format__ (__wprintf__, 3, 0))) */;
+
+
+/* Read formatted input from STREAM.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int fwscanf (__FILE *__restrict __stream,
+		    const wchar_t *__restrict __format, ...)
+     /* __attribute__ ((__format__ (__wscanf__, 2, 3))) */;
+/* Read formatted input from stdin.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int wscanf (const wchar_t *__restrict __format, ...)
+     /* __attribute__ ((__format__ (__wscanf__, 1, 2))) */;
+/* Read formatted input from S.  */
+extern int swscanf (const wchar_t *__restrict __s,
+		    const wchar_t *__restrict __format, ...)
+     __THROW /* __attribute__ ((__format__ (__wscanf__, 2, 3))) */;
+
+
+
+
+
+/* Read formatted input from S into argument list ARG.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int vfwscanf (__FILE *__restrict __s,
+		     const wchar_t *__restrict __format,
+		     __gnuc_va_list __arg)
+     /* __attribute__ ((__format__ (__wscanf__, 2, 0))) */;
+/* Read formatted input from stdin into argument list ARG.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int vwscanf (const wchar_t *__restrict __format,
+		    __gnuc_va_list __arg)
+     /* __attribute__ ((__format__ (__wscanf__, 1, 0))) */;
+/* Read formatted input from S into argument list ARG.  */
+extern int vswscanf (const wchar_t *__restrict __s,
+		     const wchar_t *__restrict __format,
+		     __gnuc_va_list __arg)
+     __THROW /* __attribute__ ((__format__ (__wscanf__, 2, 0))) */;
+
+
+
+
+
+/* Read a character from STREAM.
+
+   These functions are possible cancellation points and therefore not
+   marked with __THROW.  */
+extern wint_t fgetwc (__FILE *__stream);
+extern wint_t getwc (__FILE *__stream);
+
+/* Read a character from stdin.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern wint_t getwchar (void);
+
+
+/* Write a character to STREAM.
+
+   These functions are possible cancellation points and therefore not
+   marked with __THROW.  */
+extern wint_t fputwc (wchar_t __wc, __FILE *__stream);
+extern wint_t putwc (wchar_t __wc, __FILE *__stream);
+
+/* Write a character to stdout.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern wint_t putwchar (wchar_t __wc);
+
+
+/* Get a newline-terminated wide character string of finite length
+   from STREAM.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern wchar_t *fgetws (wchar_t *__restrict __ws, int __n,
+			__FILE *__restrict __stream);
+
+/* Write a string to STREAM.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int fputws (const wchar_t *__restrict __ws,
+		   __FILE *__restrict __stream);
+
+
+/* Push a character back onto the input buffer of STREAM.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern wint_t ungetwc (wint_t __wc, __FILE *__stream);
+
+
+
+/* These are defined to be equivalent to the `char' functions defined
+   in POSIX.1:1996.
+
+   These functions are not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation they are cancellation points and
+   therefore not marked with __THROW.  */
+extern wint_t getwc_unlocked (__FILE *__stream);
+extern wint_t getwchar_unlocked (void);
+
+/* This is the wide character version of a GNU extension.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern wint_t fgetwc_unlocked (__FILE *__stream);
+
+/* Faster version when locking is not necessary.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern wint_t fputwc_unlocked (wchar_t __wc, __FILE *__stream);
+
+/* These are defined to be equivalent to the `char' functions defined
+   in POSIX.1:1996.
+
+   These functions are not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation they are cancellation points and
+   therefore not marked with __THROW.  */
+extern wint_t putwc_unlocked (wchar_t __wc, __FILE *__stream);
+extern wint_t putwchar_unlocked (wchar_t __wc);
+
+
+/* This function does the same as `fgetws' but does not lock the stream.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern wchar_t *fgetws_unlocked (wchar_t *__restrict __ws, int __n,
+				 __FILE *__restrict __stream);
+
+/* This function does the same as `fputws' but does not lock the stream.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern int fputws_unlocked (const wchar_t *__restrict __ws,
+			    __FILE *__restrict __stream);
+
+
+
+/* Format TP into S according to FORMAT.
+   Write no more than MAXSIZE wide characters and return the number
+   of wide characters written, or 0 if it would exceed MAXSIZE.  */
+extern size_t wcsftime (wchar_t *__restrict __s, size_t __maxsize,
+			const wchar_t *__restrict __format,
+			const struct tm *__restrict __tp) __THROW;
+
+
+/* Similar to `wcsftime' but takes the information from
+   the provided locale and not the global locale.  */
+extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
+			  const wchar_t *__restrict __format,
+			  const struct tm *__restrict __tp,
+			  locale_t __loc) __THROW;
+
+
+/* Define some macros helping to catch buffer overflows.  */
+
+
+
+
+
+
+
+
+__END_DECLS
+
+
+
+
+#define _GLIBCXX_CWCHAR 1
+
+// Need to do a bit of trickery here with mbstate_t as char_traits
+// assumes it is in wchar.h, regardless of wchar_t specializations.
+
+namespace std
+{
+  using ::mbstate_t;
+} // namespace std
+
+// Get rid of those macros defined in <wchar.h> in lieu of real functions.
+#undef btowc
+#undef fgetwc
+#undef fgetws
+#undef fputwc
+#undef fputws
+#undef fwide
+#undef fwprintf
+#undef fwscanf
+#undef getwc
+#undef getwchar
+#undef mbrlen
+#undef mbrtowc
+#undef mbsinit
+#undef mbsrtowcs
+#undef putwc
+#undef putwchar
+#undef swprintf
+#undef swscanf
+#undef ungetwc
+#undef vfwprintf
+
+#undef vfwscanf
+
+#undef vswprintf
+
+#undef vswscanf
+
+#undef vwprintf
+
+#undef vwscanf
+
+#undef wcrtomb
+#undef wcscat
+#undef wcschr
+#undef wcscmp
+#undef wcscoll
+#undef wcscpy
+#undef wcscspn
+#undef wcsftime
+#undef wcslen
+#undef wcsncat
+#undef wcsncmp
+#undef wcsncpy
+#undef wcspbrk
+#undef wcsrchr
+#undef wcsrtombs
+#undef wcsspn
+#undef wcsstr
+#undef wcstod
+
+#undef wcstof
+
+#undef wcstok
+#undef wcstol
+#undef wcstoul
+#undef wcsxfrm
+#undef wctob
+#undef wmemchr
+#undef wmemcmp
+#undef wmemcpy
+#undef wmemmove
+#undef wmemset
+#undef wprintf
+#undef wscanf
+
+
+
+extern "C++"
+{
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  using ::wint_t;
+
+  using ::btowc;
+  using ::fgetwc;
+  using ::fgetws;
+  using ::fputwc;
+  using ::fputws;
+  using ::fwide;
+  using ::fwprintf;
+  using ::fwscanf;
+  using ::getwc;
+  using ::getwchar;
+  using ::mbrlen;
+  using ::mbrtowc;
+  using ::mbsinit;
+  using ::mbsrtowcs;
+  using ::putwc;
+  using ::putwchar;
+
+  using ::swprintf;
+
+  using ::swscanf;
+  using ::ungetwc;
+  using ::vfwprintf;
+
+  using ::vfwscanf;
+
+
+  using ::vswprintf;
+
+
+  using ::vswscanf;
+
+  using ::vwprintf;
+
+  using ::vwscanf;
+
+  using ::wcrtomb;
+  using ::wcscat;
+  using ::wcscmp;
+  using ::wcscoll;
+  using ::wcscpy;
+  using ::wcscspn;
+  using ::wcsftime;
+  using ::wcslen;
+  using ::wcsncat;
+  using ::wcsncmp;
+  using ::wcsncpy;
+  using ::wcsrtombs;
+  using ::wcsspn;
+  using ::wcstod;
+
+  using ::wcstof;
+
+  using ::wcstok;
+  using ::wcstol;
+  using ::wcstoul;
+  using ::wcsxfrm;
+  using ::wctob;
+  using ::wmemcmp;
+  using ::wmemcpy;
+  using ::wmemmove;
+  using ::wmemset;
+  using ::wprintf;
+  using ::wscanf;
+  using ::wcschr;
+  using ::wcspbrk;
+  using ::wcsrchr;
+  using ::wcsstr;
+  using ::wmemchr;
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+} // extern "C++"
+
+
+
+#undef wcstold
+#undef wcstoll
+#undef wcstoull
+
+namespace __gnu_cxx
+{
+
+
+
+
+
+  using ::wcstold;
+
+
+
+
+
+
+
+
+  using ::wcstoll;
+  using ::wcstoull;
+
+} // namespace __gnu_cxx
+
+namespace std
+{
+  using ::__gnu_cxx::wcstold;
+  using ::__gnu_cxx::wcstoll;
+  using ::__gnu_cxx::wcstoull;
+} // namespace
+
+
+
+
+
+
+
+
+
+namespace std
+{
+
+  using std::wcstof;
+
+
+  using std::vfwscanf;
+
+
+  using std::vswscanf;
+
+
+  using std::vwscanf;
+
+
+
+  using std::wcstold;
+  using std::wcstoll;
+  using std::wcstoull;
+
+} // namespace
+
+
+
+
+
+
+// XXX If <stdint.h> is really needed, make sure to define the macros
+// before including it, in order not to break <tr1/cstdint> (and <cstdint>
+// in C++11).  Reconsider all this as soon as possible...
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // The types streamoff, streampos and wstreampos and the class
+  // template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2,
+  // 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the
+  // behaviour of these types is mostly implementation defined or
+  // unspecified. The behaviour in this implementation is as noted
+  // below.
+
+  /**
+   *  @brief  Type used by fpos, char_traits<char>, and char_traits<wchar_t>.
+   *
+   *  In clauses 21.1.3.1 and 27.4.1 streamoff is described as an
+   *  implementation defined type.
+   *  Note: In versions of GCC up to and including GCC 3.3, streamoff
+   *  was typedef long.
+  */  
+
+  typedef long          streamoff;
+
+
+
+
+
+
+
+
+  /// Integral type for I/O operation counts and buffer sizes.
+  typedef ptrdiff_t	streamsize; // Signed integral type
+
+  /**
+   *  @brief  Class representing stream positions.
+   *
+   *  The standard places no requirements upon the template parameter StateT.
+   *  In this implementation StateT must be DefaultConstructible,
+   *  CopyConstructible and Assignable.  The standard only requires that fpos
+   *  should contain a member of type StateT. In this implementation it also
+   *  contains an offset stored as a signed integer.
+   *
+   *  @param  StateT  Type passed to and returned from state().
+   */
+  template<typename _StateT>
+    class fpos
+    {
+    private:
+      streamoff	                _M_off;
+      _StateT			_M_state;
+
+    public:
+      // The standard doesn't require that fpos objects can be default
+      // constructed. This implementation provides a default
+      // constructor that initializes the offset to 0 and default
+      // constructs the state.
+      fpos()
+      : _M_off(0), _M_state() { }
+
+      // The standard requires that fpos objects can be constructed
+      // from streamoff objects using the constructor syntax, and
+      // fails to give any meaningful semantics. In this
+      // implementation implicit conversion is also allowed, and this
+      // constructor stores the streamoff as the offset and default
+      // constructs the state.
+      /// Construct position from offset.
+      fpos(streamoff __off)
+      : _M_off(__off), _M_state() { }
+
+
+      fpos(const fpos&) = default;
+      fpos& operator=(const fpos&) = default;
+      ~fpos() = default;
+
+
+      /// Convert to streamoff.
+      operator streamoff() const { return _M_off; }
+
+      /// Remember the value of @a st.
+      void
+      state(_StateT __st)
+      { _M_state = __st; }
+
+      /// Return the last set value of @a st.
+      _StateT
+      state() const
+      { return _M_state; }
+
+      // The standard requires that this operator must be defined, but
+      // gives no semantics. In this implementation it just adds its
+      // argument to the stored offset and returns *this.
+      /// Add offset to this position.
+      fpos&
+      operator+=(streamoff __off)
+      {
+	_M_off += __off;
+	return *this;
+      }
+
+      // The standard requires that this operator must be defined, but
+      // gives no semantics. In this implementation it just subtracts
+      // its argument from the stored offset and returns *this.
+      /// Subtract offset from this position.
+      fpos&
+      operator-=(streamoff __off)
+      {
+	_M_off -= __off;
+	return *this;
+      }
+
+      // The standard requires that this operator must be defined, but
+      // defines its semantics only in terms of operator-. In this
+      // implementation it constructs a copy of *this, adds the
+      // argument to that copy using operator+= and then returns the
+      // copy.
+      /// Add position and offset.
+      fpos
+      operator+(streamoff __off) const
+      {
+	fpos __pos(*this);
+	__pos += __off;
+	return __pos;
+      }
+
+      // The standard requires that this operator must be defined, but
+      // defines its semantics only in terms of operator+. In this
+      // implementation it constructs a copy of *this, subtracts the
+      // argument from that copy using operator-= and then returns the
+      // copy.
+      /// Subtract offset from position.
+      fpos
+      operator-(streamoff __off) const
+      {
+	fpos __pos(*this);
+	__pos -= __off;
+	return __pos;
+      }
+
+      // The standard requires that this operator must be defined, but
+      // defines its semantics only in terms of operator+. In this
+      // implementation it returns the difference between the offset
+      // stored in *this and in the argument.
+      /// Subtract position to return offset.
+      streamoff
+      operator-(const fpos& __other) const
+      { return _M_off - __other._M_off; }
+    };
+
+  // The standard only requires that operator== must be an
+  // equivalence relation. In this implementation two fpos<StateT>
+  // objects belong to the same equivalence class if the contained
+  // offsets compare equal.
+  /// Test if equivalent to another position.
+  template<typename _StateT>
+    inline bool
+    operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
+    { return streamoff(__lhs) == streamoff(__rhs); }
+
+  template<typename _StateT>
+    inline bool
+    operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
+    { return streamoff(__lhs) != streamoff(__rhs); }
+
+  // Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos
+  // as implementation defined types, but clause 27.2 requires that
+  // they must both be typedefs for fpos<mbstate_t>
+  /// File position for char streams.
+  typedef fpos<mbstate_t> streampos;
+  /// File position for wchar_t streams.
+  typedef fpos<mbstate_t> wstreampos;
+
+
+
+
+
+
+
+  /// File position for char16_t streams.
+  typedef fpos<mbstate_t> u16streampos;
+  /// File position for char32_t streams.
+  typedef fpos<mbstate_t> u32streampos;
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @defgroup io I/O
+   *
+   *  Nearly all of the I/O classes are parameterized on the type of
+   *  characters they read and write.  (The major exception is ios_base at
+   *  the top of the hierarchy.)  This is a change from pre-Standard
+   *  streams, which were not templates.
+   *
+   *  For ease of use and compatibility, all of the basic_* I/O-related
+   *  classes are given typedef names for both of the builtin character
+   *  widths (wide and narrow).  The typedefs are the same as the
+   *  pre-Standard names, for example:
+   *
+   *  @code
+   *     typedef basic_ifstream<char>  ifstream;
+   *  @endcode
+   *
+   *  Because properly forward-declaring these classes can be difficult, you
+   *  should not do it yourself.  Instead, include the &lt;iosfwd&gt;
+   *  header, which contains only declarations of all the I/O classes as
+   *  well as the typedefs.  Trying to forward-declare the typedefs
+   *  themselves (e.g., <code>class ostream;</code>) is not valid ISO C++.
+   *
+   *  For more specific declarations, see
+   *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects
+   *
+   *  @{
+  */
+  class ios_base;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_ios;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_streambuf;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_istream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_ostream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_iostream;
+
+
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT>,
+	    typename _Alloc = allocator<_CharT> >
+    class basic_stringbuf;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT>,
+	   typename _Alloc = allocator<_CharT> >
+    class basic_istringstream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT>,
+	   typename _Alloc = allocator<_CharT> >
+    class basic_ostringstream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT>,
+	   typename _Alloc = allocator<_CharT> >
+    class basic_stringstream;
+
+_GLIBCXX_END_NAMESPACE_CXX11
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_filebuf;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_ifstream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_ofstream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class basic_fstream;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class istreambuf_iterator;
+
+  template<typename _CharT, typename _Traits = char_traits<_CharT> >
+    class ostreambuf_iterator;
+
+
+  /// Base class for @c char streams.
+  typedef basic_ios<char> 		ios;
+
+  /// Base class for @c char buffers.
+  typedef basic_streambuf<char> 	streambuf;
+
+  /// Base class for @c char input streams.
+  typedef basic_istream<char> 		istream;
+
+  /// Base class for @c char output streams.
+  typedef basic_ostream<char> 		ostream;
+
+  /// Base class for @c char mixed input and output streams.
+  typedef basic_iostream<char> 		iostream;
+
+  /// Class for @c char memory buffers.
+  typedef basic_stringbuf<char> 	stringbuf;
+
+  /// Class for @c char input memory streams.
+  typedef basic_istringstream<char> 	istringstream;
+
+  /// Class for @c char output memory streams.
+  typedef basic_ostringstream<char> 	ostringstream;
+
+  /// Class for @c char mixed input and output memory streams.
+  typedef basic_stringstream<char> 	stringstream;
+
+  /// Class for @c char file buffers.
+  typedef basic_filebuf<char> 		filebuf;
+
+  /// Class for @c char input file streams.
+  typedef basic_ifstream<char> 		ifstream;
+
+  /// Class for @c char output file streams.
+  typedef basic_ofstream<char> 		ofstream;
+
+  /// Class for @c char mixed input and output file streams.
+  typedef basic_fstream<char> 		fstream;
+
+
+  /// Base class for @c wchar_t streams.
+  typedef basic_ios<wchar_t> 		wios;
+
+  /// Base class for @c wchar_t buffers.
+  typedef basic_streambuf<wchar_t> 	wstreambuf;
+
+  /// Base class for @c wchar_t input streams.
+  typedef basic_istream<wchar_t> 	wistream;
+
+  /// Base class for @c wchar_t output streams.
+  typedef basic_ostream<wchar_t> 	wostream;
+
+  /// Base class for @c wchar_t mixed input and output streams.
+  typedef basic_iostream<wchar_t> 	wiostream;
+
+  /// Class for @c wchar_t memory buffers.
+  typedef basic_stringbuf<wchar_t> 	wstringbuf;
+
+  /// Class for @c wchar_t input memory streams.
+  typedef basic_istringstream<wchar_t> 	wistringstream;
+
+  /// Class for @c wchar_t output memory streams.
+  typedef basic_ostringstream<wchar_t> 	wostringstream;
+
+  /// Class for @c wchar_t mixed input and output memory streams.
+  typedef basic_stringstream<wchar_t> 	wstringstream;
+
+  /// Class for @c wchar_t file buffers.
+  typedef basic_filebuf<wchar_t> 	wfilebuf;
+
+  /// Class for @c wchar_t input file streams.
+  typedef basic_ifstream<wchar_t> 	wifstream;
+
+  /// Class for @c wchar_t output file streams.
+  typedef basic_ofstream<wchar_t> 	wofstream;
+
+  /// Class for @c wchar_t mixed input and output file streams.
+  typedef basic_fstream<wchar_t> 	wfstream;
+
+  /** @}  */
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// Exception Handling support header for -*- C++ -*-
+
+// Copyright (C) 1995-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file exception
+ *  This is a Standard C++ Library header.
+ */
+
+
+#define __EXCEPTION__ 
+
+       
+
+#pragma GCC visibility push(default)
+
+
+// Exception Handling support header for -*- C++ -*-
+
+// Copyright (C) 2016-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/exception.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly.
+ */
+
+
+#define __EXCEPTION_H 1
+
+       
+
+#pragma GCC visibility push(default)
+
+
+
+extern "C++" {
+
+namespace std
+{
+  /**
+   * @defgroup exceptions Exceptions
+   * @ingroup diagnostics
+   *
+   * Classes and functions for reporting errors via exception classes.
+   * @{
+   */
+
+  /**
+   *  @brief Base class for all library exceptions.
+   *
+   *  This is the base class for all exceptions thrown by the standard
+   *  library, and by certain language expressions.  You are free to derive
+   *  your own %exception classes, or use a different hierarchy, or to
+   *  throw non-class data (e.g., fundamental types).
+   */
+  class exception
+  {
+  public:
+    exception() _GLIBCXX_NOTHROW { }
+    virtual ~exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_NOTHROW;
+
+    exception(const exception&) = default;
+    exception& operator=(const exception&) = default;
+    exception(exception&&) = default;
+    exception& operator=(exception&&) = default;
+
+
+    /** Returns a C-style character string describing the general cause
+     *  of the current error.  */
+    virtual const char*
+    what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_NOTHROW;
+  };
+
+} // namespace std
+
+}
+
+#pragma GCC visibility pop
+
+
+extern "C++" {
+
+namespace std
+{
+  /** @addtogroup exceptions
+   *  @{
+   */
+
+  /** If an %exception is thrown which is not listed in a function's
+   *  %exception specification, one of these may be thrown.  */
+  class bad_exception : public exception
+  {
+  public:
+    bad_exception() _GLIBCXX_USE_NOEXCEPT { }
+
+    // This declaration is not useless:
+    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
+    virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
+
+    // See comment in eh_exception.cc.
+    virtual const char*
+    what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
+  };
+
+  /// If you write a replacement %terminate handler, it must be of this type.
+  typedef void (*terminate_handler) ();
+
+  /// If you write a replacement %unexpected handler, it must be of this type.
+  typedef void (*unexpected_handler) ();
+
+  /// Takes a new handler function as an argument, returns the old function.
+  terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
+
+
+  /// Return the current terminate handler.
+  terminate_handler get_terminate() noexcept;
+
+
+  /** The runtime will call this function if %exception handling must be
+   *  abandoned for any reason.  It can also be called by the user.  */
+  void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
+
+  /// Takes a new handler function as an argument, returns the old function.
+  unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT;
+
+
+  /// Return the current unexpected handler.
+  unexpected_handler get_unexpected() noexcept;
+
+
+  /** The runtime will call this function if an %exception is thrown which
+   *  violates the function's %exception specification.  */
+  void unexpected() __attribute__ ((__noreturn__));
+
+  /** [18.6.4]/1:  'Returns true after completing evaluation of a
+   *  throw-expression until either completing initialization of the
+   *  exception-declaration in the matching handler or entering @c unexpected()
+   *  due to the throw; or after entering @c terminate() for any reason
+   *  other than an explicit call to @c terminate().  [Note: This includes
+   *  stack unwinding [15.2].  end note]'
+   *
+   *  2: 'When @c uncaught_exception() is true, throwing an
+   *  %exception can result in a call of @c terminate()
+   *  (15.5.1).'
+   */
+  _GLIBCXX17_DEPRECATED
+  bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
+
+
+#define __cpp_lib_uncaught_exceptions 201411L
+  /// The number of uncaught exceptions.
+  int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
+
+
+  // @} group exceptions
+} // namespace std
+
+namespace __gnu_cxx
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @brief A replacement for the standard terminate_handler which
+   *  prints more information about the terminating exception (if any)
+   *  on stderr.
+   *
+   *  @ingroup exceptions
+   *
+   *  Call
+   *   @code
+   *     std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
+   *   @endcode
+   *  to use.  For more info, see
+   *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
+   *
+   *  In 3.4 and later, this is on by default.
+   */
+  void __verbose_terminate_handler();
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+} // extern "C++"
+
+#pragma GCC visibility pop
+
+
+// Exception Handling support header (exception_ptr class) for -*- C++ -*-
+
+// Copyright (C) 2008-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+// 
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/exception_ptr.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{exception}
+ */
+
+
+#define _EXCEPTION_PTR_H 
+
+#pragma GCC visibility push(default)
+
+
+// -fno-exceptions Support -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/exception_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{exception}
+ */
+
+
+#define _EXCEPTION_DEFINES_H 1
+
+
+
+
+
+
+
+// Else proceed normally.
+#define __try try
+#define __catch(X) catch(X)
+#define __throw_exception_again throw
+
+
+// ABI Support -*- C++ -*-
+
+// Copyright (C) 2016-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cxxabi_init_exception.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly.
+ */
+
+
+#define _CXXABI_INIT_EXCEPTION_H 1
+
+       
+
+#pragma GCC visibility push(default)
+
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+
+
+
+
+
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+
+
+
+#define _STDDEF_H 
+#define _STDDEF_H_ 
+/* snaroff@next.com says the NeXT needs this.  */
+#define _ANSI_STDDEF_H 
+
+
+
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+
+
+
+
+
+
+
+
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+
+
+
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+
+
+
+
+
+
+
+
+#define _PTRDIFF_T 
+#define _T_PTRDIFF_ 
+#define _T_PTRDIFF 
+#define __PTRDIFF_T 
+#define _PTRDIFF_T_ 
+#define _BSD_PTRDIFF_T_ 
+#define ___int_ptrdiff_t_h 
+#define _GCC_PTRDIFF_T 
+#define _PTRDIFF_T_DECLARED 
+
+
+
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+
+
+
+
+
+
+
+
+
+
+/* If this symbol has done its job, get rid of it.  */
+#undef __need_ptrdiff_t
+
+
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_size_t
+
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_wchar_t
+
+
+
+
+
+
+/* A null pointer constant.  */
+
+
+#undef NULL
+
+#define NULL __null
+
+
+
+
+
+
+
+
+#undef __need_NULL
+
+
+
+/* Offset of member MEMBER in a struct of type TYPE. */
+#define offsetof(TYPE,MEMBER) __builtin_offsetof (TYPE, MEMBER)
+
+
+
+
+#define _GCC_MAX_ALIGN_T 
+/* Type whose alignment is supported in every context and is at least
+   as great as that of any standard type not using alignment
+   specifiers.  */
+typedef struct {
+  long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
+  long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
+  /* _Float128 is defined as a basic type, so max_align_t must be
+     sufficiently aligned for it.  This code must work in C++, so we
+     use __float128 here; that is only available on some
+     architectures, but only on i386 is extra alignment needed for
+     __float128.  */
+
+
+
+} max_align_t;
+
+
+
+
+
+#define _GXX_NULLPTR_T 
+  typedef decltype(nullptr) nullptr_t;
+
+
+
+
+
+
+
+
+#define _GLIBCXX_CDTOR_CALLABI 
+#define _GLIBCXX_HAVE_CDTOR_CALLABI 0
+
+
+
+
+
+
+namespace std
+{
+  class type_info;
+}
+
+namespace __cxxabiv1
+{
+  struct __cxa_refcounted_exception;
+
+  extern "C"
+    {
+      // Allocate memory for the primary exception plus the thrown object.
+      void*
+      __cxa_allocate_exception(size_t) _GLIBCXX_NOTHROW;
+
+      void
+      __cxa_free_exception(void*) _GLIBCXX_NOTHROW;
+
+      // Initialize exception (this is a GNU extension)
+      __cxa_refcounted_exception*
+      __cxa_init_primary_exception(void *object, std::type_info *tinfo,
+                void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) _GLIBCXX_NOTHROW;
+
+    }
+} // namespace __cxxabiv1
+
+
+
+#pragma GCC visibility pop
+
+// RTTI support for -*- C++ -*-
+// Copyright (C) 1994-2021 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file typeinfo
+ *  This is a Standard C++ Library header.
+ */
+
+
+#define _TYPEINFO 
+
+       
+
+
+
+// Declarations for hash functions. -*- C++ -*-
+
+// Copyright (C) 2010-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/hash_bytes.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{functional}
+ */
+
+
+#define _HASH_BYTES_H 1
+
+       
+
+
+
+namespace std
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Hash function implementation for the nontrivial specialization.
+  // All of them are based on a primitive that hashes a pointer to a
+  // byte array. The actual hash algorithm is not guaranteed to stay
+  // the same from release to release -- it may be updated or tuned to
+  // improve hash quality or speed.
+  size_t
+  _Hash_bytes(const void* __ptr, size_t __len, size_t __seed);
+
+  // A similar hash primitive, using the FNV hash algorithm. This
+  // algorithm is guaranteed to stay the same from release to release.
+  // (although it might not produce the same values on different
+  // machines.)
+  size_t
+  _Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed);
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+
+#pragma GCC visibility push(default)
+
+extern "C++" {
+
+namespace __cxxabiv1
+{
+  class __class_type_info;
+} // namespace __cxxabiv1
+
+// Determine whether typeinfo names for the same type are merged (in which
+// case comparison can just compare pointers) or not (in which case strings
+// must be compared), and whether comparison is to be implemented inline or
+// not.  We used to do inline pointer comparison by default if weak symbols
+// are available, but even with weak symbols sometimes names are not merged
+// when objects are loaded with RTLD_LOCAL, so now we always use strcmp by
+// default.  For ABI compatibility, we do the strcmp inline if weak symbols
+// are available, and out-of-line if not.  Out-of-line pointer comparison
+// is used where the object files are to be portable to multiple systems,
+// some of which may not be able to use pointer comparison, but the
+// particular system for which libstdc++ is being built can use pointer
+// comparison; in particular for most ARM EABI systems, where the ABI
+// specifies out-of-line comparison.  The compiler's target configuration
+// can override the defaults by defining __GXX_TYPEINFO_EQUALITY_INLINE to
+// 1 or 0 to indicate whether or not comparison is inline, and
+// __GXX_MERGED_TYPEINFO_NAMES to 1 or 0 to indicate whether or not pointer
+// comparison can be used.
+
+
+// By default, typeinfo names are not merged.
+#define __GXX_MERGED_TYPEINFO_NAMES 0
+
+
+// By default follow the old inline rules to avoid ABI changes.
+
+  
+
+
+    #define __GXX_TYPEINFO_EQUALITY_INLINE 1
+  
+
+
+namespace std
+{
+  /**
+   *  @brief  Part of RTTI.
+   *
+   *  The @c type_info class describes type information generated by
+   *  an implementation.
+  */
+  class type_info
+  {
+  public:
+    /** Destructor first. Being the first non-inline virtual function, this
+     *  controls in which translation unit the vtable is emitted. The
+     *  compiler makes use of that information to know where to emit
+     *  the runtime-mandated type_info structures in the new-abi.  */
+    virtual ~type_info();
+
+    /** Returns an @e implementation-defined byte string; this is not
+     *  portable between compilers!  */
+    const char* name() const _GLIBCXX_NOEXCEPT
+    { return __name[0] == '*' ? __name + 1 : __name; }
+
+
+
+
+
+
+
+
+  
+    /** Returns true if @c *this precedes @c __arg in the implementation's
+     *  collation order.  */
+    // Even with the new abi, on systems that support dlopen
+    // we can run into cases where type_info names aren't merged,
+    // so we still need to do string comparison.
+    bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT
+    { return (__name[0] == '*' && __arg.__name[0] == '*')
+	? __name < __arg.__name
+	: __builtin_strcmp (__name, __arg.__name) < 0; }
+
+    bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
+    {
+      return ((__name == __arg.__name)
+	      || (__name[0] != '*' &&
+		  __builtin_strcmp (__name, __arg.__name) == 0));
+    }
+
+
+
+    bool operator!=(const type_info& __arg) const _GLIBCXX_NOEXCEPT
+    { return !operator==(__arg); }
+
+
+
+    size_t hash_code() const noexcept
+    {
+
+      return _Hash_bytes(name(), __builtin_strlen(name()),
+			 static_cast<size_t>(0xc70f6907UL));
+
+
+
+    }
+
+
+    // Return true if this is a pointer type of some kind
+    virtual bool __is_pointer_p() const;
+
+    // Return true if this is a function type
+    virtual bool __is_function_p() const;
+
+    // Try and catch a thrown type. Store an adjusted pointer to the
+    // caught type in THR_OBJ. If THR_TYPE is not a pointer type, then
+    // THR_OBJ points to the thrown object. If THR_TYPE is a pointer
+    // type, then THR_OBJ is the pointer itself. OUTER indicates the
+    // number of outer pointers, and whether they were const
+    // qualified.
+    virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
+			    unsigned __outer) const;
+
+    // Internally used during catch matching
+    virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,
+			     void **__obj_ptr) const;
+
+  protected:
+    const char *__name;
+
+    explicit type_info(const char *__n): __name(__n) { }
+
+  private:
+    /// Assigning type_info is not supported.
+    type_info& operator=(const type_info&);
+    type_info(const type_info&);
+  };
+
+  /**
+   *  @brief  Thrown during incorrect typecasting.
+   *  @ingroup exceptions
+   *
+   *  If you attempt an invalid @c dynamic_cast expression, an instance of
+   *  this class (or something derived from this class) is thrown.  */
+  class bad_cast : public exception
+  {
+  public:
+    bad_cast() _GLIBCXX_USE_NOEXCEPT { }
+
+    // This declaration is not useless:
+    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
+    virtual ~bad_cast() _GLIBCXX_USE_NOEXCEPT;
+
+    // See comment in eh_exception.cc.
+    virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
+  };
+
+  /**
+   *  @brief Thrown when a NULL pointer in a @c typeid expression is used.
+   *  @ingroup exceptions
+   */
+  class bad_typeid : public exception
+  {
+  public:
+    bad_typeid () _GLIBCXX_USE_NOEXCEPT { }
+
+    // This declaration is not useless:
+    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
+    virtual ~bad_typeid() _GLIBCXX_USE_NOEXCEPT;
+
+    // See comment in eh_exception.cc.
+    virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
+  };
+} // namespace std
+
+} // extern "C++"
+
+#pragma GCC visibility pop
+
+// The -*- C++ -*- dynamic memory management header.
+
+// Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3, or (at your option)
+// any later version.
+// 
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file new
+ *  This is a Standard C++ Library header.
+ *
+ *  The header @c new defines several functions to manage dynamic memory and
+ *  handling memory allocation errors; see
+ *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/dynamic_memory.html
+ *  for more.
+ */
+
+
+#define _NEW 
+
+       
+
+
+
+
+#pragma GCC visibility push(default)
+
+extern "C++" {
+
+namespace std 
+{
+  /**
+   *  @brief  Exception possibly thrown by @c new.
+   *  @ingroup exceptions
+   *
+   *  @c bad_alloc (or classes derived from it) is used to report allocation
+   *  errors from the throwing forms of @c new.  */
+  class bad_alloc : public exception
+  {
+  public:
+    bad_alloc() throw() { }
+
+
+    bad_alloc(const bad_alloc&) = default;
+    bad_alloc& operator=(const bad_alloc&) = default;
+
+
+    // This declaration is not useless:
+    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
+    virtual ~bad_alloc() throw();
+
+    // See comment in eh_exception.cc.
+    virtual const char* what() const throw();
+  };
+
+
+  class bad_array_new_length : public bad_alloc
+  {
+  public:
+    bad_array_new_length() throw() { }
+
+    // This declaration is not useless:
+    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
+    virtual ~bad_array_new_length() throw();
+
+    // See comment in eh_exception.cc.
+    virtual const char* what() const throw();
+  };
+
+
+
+  enum class align_val_t: size_t {};
+
+
+  struct nothrow_t
+  {
+
+    explicit nothrow_t() = default;
+
+  };
+
+  extern const nothrow_t nothrow;
+
+  /** If you write your own error handler to be called by @c new, it must
+   *  be of this type.  */
+  typedef void (*new_handler)();
+
+  /// Takes a replacement handler as the argument, returns the
+  /// previous handler.
+  new_handler set_new_handler(new_handler) throw();
+
+
+  /// Return the current new handler.
+  new_handler get_new_handler() noexcept;
+
+} // namespace std
+
+//@{
+/** These are replaceable signatures:
+ *  - normal single new and delete (no arguments, throw @c bad_alloc on error)
+ *  - normal array new and delete (same)
+ *  - @c nothrow single new and delete (take a @c nothrow argument, return
+ *    @c NULL on error)
+ *  - @c nothrow array new and delete (same)
+ *
+ *  Placement new and delete signatures (take a memory address argument,
+ *  does nothing) may not be replaced by a user's program.
+*/
+_GLIBCXX_NODISCARD void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
+  __attribute__((__externally_visible__));
+_GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
+  __attribute__((__externally_visible__));
+void operator delete(void*) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+
+void operator delete(void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+void operator delete[](void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+
+_GLIBCXX_NODISCARD void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+_GLIBCXX_NODISCARD void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+  __attribute__((__externally_visible__));
+
+_GLIBCXX_NODISCARD void* operator new(std::size_t, std::align_val_t)
+  __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+_GLIBCXX_NODISCARD void* operator new(std::size_t, std::align_val_t, const std::nothrow_t&)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+void operator delete(void*, std::align_val_t)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+void operator delete(void*, std::align_val_t, const std::nothrow_t&)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+_GLIBCXX_NODISCARD void* operator new[](std::size_t, std::align_val_t)
+  __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+_GLIBCXX_NODISCARD void* operator new[](std::size_t, std::align_val_t, const std::nothrow_t&)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__, __alloc_size__ (1), __malloc__));
+void operator delete[](void*, std::align_val_t)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+void operator delete[](void*, std::align_val_t, const std::nothrow_t&)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+
+void operator delete(void*, std::size_t, std::align_val_t)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+void operator delete[](void*, std::size_t, std::align_val_t)
+  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
+
+
+
+// Default placement versions of operator new.
+_GLIBCXX_NODISCARD inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
+{ return __p; }
+_GLIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
+{ return __p; }
+
+// Default placement versions of operator delete.
+inline void operator delete  (void*, void*) _GLIBCXX_USE_NOEXCEPT { }
+inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { }
+//@}
+} // extern "C++"
+
+
+
+namespace std
+{
+#define __cpp_lib_launder 201606
+  /// Pointer optimization barrier [ptr.launder]
+  template<typename _Tp>
+    [[nodiscard]] constexpr _Tp*
+    launder(_Tp* __p) noexcept
+    { return __builtin_launder(__p); }
+
+  // The program is ill-formed if T is a function type or
+  // (possibly cv-qualified) void.
+
+  template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
+    void launder(_Ret (*)(_Args...) _GLIBCXX_NOEXCEPT_QUAL) = delete;
+  template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
+    void launder(_Ret (*)(_Args......) _GLIBCXX_NOEXCEPT_QUAL) = delete;
+
+  void launder(void*) = delete;
+  void launder(const void*) = delete;
+  void launder(volatile void*) = delete;
+  void launder(const volatile void*) = delete;
+}
+
+
+
+
+#pragma GCC visibility pop
+
+
+
+
+
+#define _GLIBCXX_EH_PTR_USED 
+
+
+extern "C++" {
+
+namespace std 
+{
+  class type_info;
+
+  /**
+   * @addtogroup exceptions
+   * @{
+   */
+
+  namespace __exception_ptr
+  {
+    class exception_ptr;
+  }
+
+  using __exception_ptr::exception_ptr;
+
+  /** Obtain an exception_ptr to the currently handled exception. If there
+   *  is none, or the currently handled exception is foreign, return the null
+   *  value.
+   */
+  exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT;
+
+  template<typename _Ex>
+  exception_ptr make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;
+
+  /// Throw the object pointed to by the exception_ptr.
+  void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
+
+  namespace __exception_ptr
+  {
+    using std::rethrow_exception;
+
+    /**
+     *  @brief An opaque pointer to an arbitrary exception.
+     *  @ingroup exceptions
+     */
+    class exception_ptr
+    {
+      void* _M_exception_object;
+
+      explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT;
+
+      void _M_addref() _GLIBCXX_USE_NOEXCEPT;
+      void _M_release() _GLIBCXX_USE_NOEXCEPT;
+
+      void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__));
+
+      friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT;
+      friend void std::rethrow_exception(exception_ptr);
+      template<typename _Ex>
+      friend exception_ptr std::make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;
+
+    public:
+      exception_ptr() _GLIBCXX_USE_NOEXCEPT;
+
+      exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
+
+
+      exception_ptr(nullptr_t) noexcept
+      : _M_exception_object(nullptr)
+      { }
+
+      exception_ptr(exception_ptr&& __o) noexcept
+      : _M_exception_object(__o._M_exception_object)
+      { __o._M_exception_object = nullptr; }
+
+
+
+
+
+
+
+
+
+      exception_ptr& 
+      operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
+
+
+      exception_ptr& 
+      operator=(exception_ptr&& __o) noexcept
+      {
+        exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
+        return *this;
+      }
+
+
+      ~exception_ptr() _GLIBCXX_USE_NOEXCEPT;
+
+      void 
+      swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
+
+
+
+      explicit operator bool() const noexcept
+      { return _M_exception_object; }
+
+
+
+
+
+
+
+      friend _GLIBCXX_EH_PTR_USED bool
+      operator==(const exception_ptr& __x, const exception_ptr& __y)
+      _GLIBCXX_USE_NOEXCEPT
+      { return __x._M_exception_object == __y._M_exception_object; }
+
+      friend _GLIBCXX_EH_PTR_USED bool
+      operator!=(const exception_ptr& __x, const exception_ptr& __y)
+      _GLIBCXX_USE_NOEXCEPT
+      { return __x._M_exception_object != __y._M_exception_object; }
+
+
+      const class std::type_info*
+      __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT
+	__attribute__ ((__pure__));
+    };
+
+    _GLIBCXX_EH_PTR_USED
+    inline
+    exception_ptr::exception_ptr() _GLIBCXX_NOEXCEPT
+    : _M_exception_object(0)
+    { }
+
+    _GLIBCXX_EH_PTR_USED
+    inline
+    exception_ptr::exception_ptr(const exception_ptr& __other) _GLIBCXX_NOEXCEPT
+    : _M_exception_object(__other._M_exception_object)
+    {
+      if (_M_exception_object)
+	_M_addref();
+    }
+
+    _GLIBCXX_EH_PTR_USED
+    inline
+    exception_ptr::~exception_ptr() _GLIBCXX_USE_NOEXCEPT
+    {
+      if (_M_exception_object)
+	_M_release();
+    }
+
+    _GLIBCXX_EH_PTR_USED
+    inline exception_ptr&
+    exception_ptr::operator=(const exception_ptr& __other) _GLIBCXX_USE_NOEXCEPT
+    {
+      exception_ptr(__other).swap(*this);
+      return *this;
+    }
+
+    _GLIBCXX_EH_PTR_USED
+    inline void
+    exception_ptr::swap(exception_ptr &__other) _GLIBCXX_USE_NOEXCEPT
+    {
+      void *__tmp = _M_exception_object;
+      _M_exception_object = __other._M_exception_object;
+      __other._M_exception_object = __tmp;
+    }
+
+    /// @relates exception_ptr
+    inline void
+    swap(exception_ptr& __lhs, exception_ptr& __rhs)
+    { __lhs.swap(__rhs); }
+
+    /// @cond undocumented
+    template<typename _Ex>
+      inline void
+      __dest_thunk(void* __x)
+      { static_cast<_Ex*>(__x)->~_Ex(); }
+    /// @endcond
+
+  } // namespace __exception_ptr
+
+  /// Obtain an exception_ptr pointing to a copy of the supplied object.
+  template<typename _Ex>
+    exception_ptr 
+    make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT
+    {
+
+      void* __e = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ex));
+      (void) __cxxabiv1::__cxa_init_primary_exception(
+	  __e, const_cast<std::type_info*>(&typeid(__ex)),
+	  __exception_ptr::__dest_thunk<_Ex>);
+      try
+	{
+          ::new (__e) _Ex(__ex);
+          return exception_ptr(__e);
+	}
+      catch(...)
+	{
+	  __cxxabiv1::__cxa_free_exception(__e);
+	  return current_exception();
+	}
+    }
+
+#undef _GLIBCXX_EH_PTR_USED
+
+  // @} group exceptions
+} // namespace std
+
+} // extern "C++"
+
+#pragma GCC visibility pop
+
+// Nested Exception support header (nested_exception class) for -*- C++ -*-
+
+// Copyright (C) 2009-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/nested_exception.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{exception}
+ */
+
+
+#define _GLIBCXX_NESTED_EXCEPTION_H 1
+
+#pragma GCC visibility push(default)
+
+
+
+
+
+
+// Move, forward and identity for C++11 + swap -*- C++ -*-
+
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/move.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{utility}
+ */
+
+
+#define _MOVE_H 1
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Used, in C++03 mode too, by allocators, etc.
+  /**
+   *  @brief Same as C++11 std::addressof
+   *  @ingroup utilities
+   */
+  template<typename _Tp>
+    inline _GLIBCXX_CONSTEXPR _Tp*
+    __addressof(_Tp& __r) _GLIBCXX_NOEXCEPT
+    { return __builtin_addressof(__r); }
+
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// C++11 <type_traits> -*- C++ -*-
+
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/type_traits
+ *  This is a Standard C++ Library header.
+ */
+
+
+#define _GLIBCXX_TYPE_TRAITS 1
+
+       
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * @defgroup metaprogramming Metaprogramming
+   * @ingroup utilities
+   *
+   * Template utilities for compile-time introspection and modification,
+   * including type classification traits, type property inspection traits
+   * and type transformation traits.
+   *
+   * @{
+   */
+
+  /// integral_constant
+  template<typename _Tp, _Tp __v>
+    struct integral_constant
+    {
+      static constexpr _Tp                  value = __v;
+      typedef _Tp                           value_type;
+      typedef integral_constant<_Tp, __v>   type;
+      constexpr operator value_type() const noexcept { return value; }
+
+
+#define __cpp_lib_integral_constant_callable 201304
+
+      constexpr value_type operator()() const noexcept { return value; }
+
+    };
+
+  template<typename _Tp, _Tp __v>
+    constexpr _Tp integral_constant<_Tp, __v>::value;
+
+  /// The type used as a compile-time boolean with true value.
+  typedef integral_constant<bool, true>     true_type;
+
+  /// The type used as a compile-time boolean with false value.
+  typedef integral_constant<bool, false>    false_type;
+
+  template<bool __v>
+    using __bool_constant = integral_constant<bool, __v>;
+
+
+#define __cpp_lib_bool_constant 201505
+  template<bool __v>
+    using bool_constant = integral_constant<bool, __v>;
+
+
+  // Meta programming helper types.
+
+  template<bool, typename, typename>
+    struct conditional;
+
+  template <typename _Type>
+    struct __type_identity
+    { using type = _Type; };
+
+  template<typename _Tp>
+    using __type_identity_t = typename __type_identity<_Tp>::type;
+
+  template<typename...>
+    struct __or_;
+
+  template<>
+    struct __or_<>
+    : public false_type
+    { };
+
+  template<typename _B1>
+    struct __or_<_B1>
+    : public _B1
+    { };
+
+  template<typename _B1, typename _B2>
+    struct __or_<_B1, _B2>
+    : public conditional<_B1::value, _B1, _B2>::type
+    { };
+
+  template<typename _B1, typename _B2, typename _B3, typename... _Bn>
+    struct __or_<_B1, _B2, _B3, _Bn...>
+    : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
+    { };
+
+  template<typename...>
+    struct __and_;
+
+  template<>
+    struct __and_<>
+    : public true_type
+    { };
+
+  template<typename _B1>
+    struct __and_<_B1>
+    : public _B1
+    { };
+
+  template<typename _B1, typename _B2>
+    struct __and_<_B1, _B2>
+    : public conditional<_B1::value, _B2, _B1>::type
+    { };
+
+  template<typename _B1, typename _B2, typename _B3, typename... _Bn>
+    struct __and_<_B1, _B2, _B3, _Bn...>
+    : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
+    { };
+
+  template<typename _Pp>
+    struct __not_
+    : public __bool_constant<!bool(_Pp::value)>
+    { };
+
+
+
+  template<typename... _Bn>
+    inline constexpr bool __or_v = __or_<_Bn...>::value;
+  template<typename... _Bn>
+    inline constexpr bool __and_v = __and_<_Bn...>::value;
+
+#define __cpp_lib_logical_traits 201510
+
+  template<typename... _Bn>
+    struct conjunction
+    : __and_<_Bn...>
+    { };
+
+  template<typename... _Bn>
+    struct disjunction
+    : __or_<_Bn...>
+    { };
+
+  template<typename _Pp>
+    struct negation
+    : __not_<_Pp>
+    { };
+
+  template<typename... _Bn>
+    inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
+
+  template<typename... _Bn>
+    inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
+
+  template<typename _Pp>
+    inline constexpr bool negation_v = negation<_Pp>::value;
+
+
+
+  // Forward declarations
+  template<typename>
+    struct is_reference;
+  template<typename>
+    struct is_function;
+  template<typename>
+    struct is_void;
+  template<typename>
+    struct __is_array_unknown_bounds;
+
+  // Helper functions that return false_type for incomplete classes,
+  // incomplete unions and arrays of known bound from those.
+
+  template <typename _Tp, size_t = sizeof(_Tp)>
+    constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>)
+    { return {}; }
+
+  template <typename _TypeIdentity,
+      typename _NestedType = typename _TypeIdentity::type>
+    constexpr typename __or_<
+      is_reference<_NestedType>,
+      is_function<_NestedType>,
+      is_void<_NestedType>,
+      __is_array_unknown_bounds<_NestedType>
+    >::type __is_complete_or_unbounded(_TypeIdentity)
+    { return {}; }
+
+  // For several sfinae-friendly trait implementations we transport both the
+  // result information (as the member type) and the failure information (no
+  // member type). This is very similar to std::enable_if, but we cannot use
+  // them, because we need to derive from them as an implementation detail.
+
+  template<typename _Tp>
+    struct __success_type
+    { typedef _Tp type; };
+
+  struct __failure_type
+  { };
+
+  template<typename>
+    struct remove_cv;
+
+  // __remove_cv_t (std::remove_cv_t for C++11).
+  template<typename _Tp>
+    using __remove_cv_t = typename remove_cv<_Tp>::type;
+
+  template<typename>
+    struct is_const;
+
+  // Primary type categories.
+
+  template<typename>
+    struct __is_void_helper
+    : public false_type { };
+
+  template<>
+    struct __is_void_helper<void>
+    : public true_type { };
+
+  /// is_void
+  template<typename _Tp>
+    struct is_void
+    : public __is_void_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  template<typename>
+    struct __is_integral_helper
+    : public false_type { };
+
+  template<>
+    struct __is_integral_helper<bool>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<char>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<signed char>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<unsigned char>
+    : public true_type { };
+
+  // We want is_integral<wchar_t> to be true (and make_signed/unsigned to work)
+  // even when libc doesn't provide working <wchar.h> and related functions,
+  // so check __WCHAR_TYPE__ instead of _GLIBCXX_USE_WCHAR_T.
+
+  template<>
+    struct __is_integral_helper<wchar_t>
+    : public true_type { };
+
+
+
+
+
+
+
+
+  template<>
+    struct __is_integral_helper<char16_t>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<char32_t>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<short>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<unsigned short>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<int>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<unsigned int>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<long>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<unsigned long>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<long long>
+    : public true_type { };
+
+  template<>
+    struct __is_integral_helper<unsigned long long>
+    : public true_type { };
+
+  // Conditionalizing on __STRICT_ANSI__ here will break any port that
+  // uses one of these types for size_t.
+
+  /// is_integral
+  template<typename _Tp>
+    struct is_integral
+    : public __is_integral_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  template<typename>
+    struct __is_floating_point_helper
+    : public false_type { };
+
+  template<>
+    struct __is_floating_point_helper<float>
+    : public true_type { };
+
+  template<>
+    struct __is_floating_point_helper<double>
+    : public true_type { };
+
+  template<>
+    struct __is_floating_point_helper<long double>
+    : public true_type { };
+
+
+
+
+
+
+
+  /// is_floating_point
+  template<typename _Tp>
+    struct is_floating_point
+    : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  /// is_array
+  template<typename>
+    struct is_array
+    : public false_type { };
+
+  template<typename _Tp, std::size_t _Size>
+    struct is_array<_Tp[_Size]>
+    : public true_type { };
+
+  template<typename _Tp>
+    struct is_array<_Tp[]>
+    : public true_type { };
+
+  template<typename>
+    struct __is_pointer_helper
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_pointer_helper<_Tp*>
+    : public true_type { };
+
+  /// is_pointer
+  template<typename _Tp>
+    struct is_pointer
+    : public __is_pointer_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  /// is_lvalue_reference
+  template<typename>
+    struct is_lvalue_reference
+    : public false_type { };
+
+  template<typename _Tp>
+    struct is_lvalue_reference<_Tp&>
+    : public true_type { };
+
+  /// is_rvalue_reference
+  template<typename>
+    struct is_rvalue_reference
+    : public false_type { };
+
+  template<typename _Tp>
+    struct is_rvalue_reference<_Tp&&>
+    : public true_type { };
+
+  template<typename>
+    struct __is_member_object_pointer_helper
+    : public false_type { };
+
+  template<typename _Tp, typename _Cp>
+    struct __is_member_object_pointer_helper<_Tp _Cp::*>
+    : public __not_<is_function<_Tp>>::type { };
+
+  /// is_member_object_pointer
+  template<typename _Tp>
+    struct is_member_object_pointer
+    : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  template<typename>
+    struct __is_member_function_pointer_helper
+    : public false_type { };
+
+  template<typename _Tp, typename _Cp>
+    struct __is_member_function_pointer_helper<_Tp _Cp::*>
+    : public is_function<_Tp>::type { };
+
+  /// is_member_function_pointer
+  template<typename _Tp>
+    struct is_member_function_pointer
+    : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  /// is_enum
+  template<typename _Tp>
+    struct is_enum
+    : public integral_constant<bool, __is_enum(_Tp)>
+    { };
+
+  /// is_union
+  template<typename _Tp>
+    struct is_union
+    : public integral_constant<bool, __is_union(_Tp)>
+    { };
+
+  /// is_class
+  template<typename _Tp>
+    struct is_class
+    : public integral_constant<bool, __is_class(_Tp)>
+    { };
+
+  /// is_function
+  template<typename _Tp>
+    struct is_function
+    : public __bool_constant<!is_const<const _Tp>::value> { };
+
+  template<typename _Tp>
+    struct is_function<_Tp&>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct is_function<_Tp&&>
+    : public false_type { };
+
+#define __cpp_lib_is_null_pointer 201309
+
+  template<typename>
+    struct __is_null_pointer_helper
+    : public false_type { };
+
+  template<>
+    struct __is_null_pointer_helper<std::nullptr_t>
+    : public true_type { };
+
+  /// is_null_pointer (LWG 2247).
+  template<typename _Tp>
+    struct is_null_pointer
+    : public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  /// __is_nullptr_t (deprecated extension).
+  template<typename _Tp>
+    struct __is_nullptr_t
+    : public is_null_pointer<_Tp>
+    { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer");
+
+  // Composite type categories.
+
+  /// is_reference
+  template<typename _Tp>
+    struct is_reference
+    : public __or_<is_lvalue_reference<_Tp>,
+                   is_rvalue_reference<_Tp>>::type
+    { };
+
+  /// is_arithmetic
+  template<typename _Tp>
+    struct is_arithmetic
+    : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
+    { };
+
+  /// is_fundamental
+  template<typename _Tp>
+    struct is_fundamental
+    : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
+		   is_null_pointer<_Tp>>::type
+    { };
+
+  /// is_object
+  template<typename _Tp>
+    struct is_object
+    : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
+                          is_void<_Tp>>>::type
+    { };
+
+  template<typename>
+    struct is_member_pointer;
+
+  /// is_scalar
+  template<typename _Tp>
+    struct is_scalar
+    : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
+                   is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
+    { };
+
+  /// is_compound
+  template<typename _Tp>
+    struct is_compound
+    : public __not_<is_fundamental<_Tp>>::type { };
+
+  template<typename _Tp>
+    struct __is_member_pointer_helper
+    : public false_type { };
+
+  template<typename _Tp, typename _Cp>
+    struct __is_member_pointer_helper<_Tp _Cp::*>
+    : public true_type { };
+
+  /// is_member_pointer
+  template<typename _Tp>
+    struct is_member_pointer
+    : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type
+    { };
+
+  template<typename, typename>
+    struct is_same;
+
+  template<typename _Tp, typename... _Types>
+    using __is_one_of = __or_<is_same<_Tp, _Types>...>;
+
+  // Check if a type is one of the signed integer types.
+  template<typename _Tp>
+    using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>,
+	  signed char, signed short, signed int, signed long,
+	  signed long long
+
+
+
+
+
+
+
+
+
+
+
+
+	  >;
+
+  // Check if a type is one of the unsigned integer types.
+  template<typename _Tp>
+    using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>,
+	  unsigned char, unsigned short, unsigned int, unsigned long,
+	  unsigned long long
+
+
+
+
+
+
+
+
+
+
+
+
+	  >;
+
+  // Check if a type is one of the signed or unsigned integer types.
+  template<typename _Tp>
+    using __is_standard_integer
+      = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>;
+
+  // __void_t (std::void_t for C++11)
+  template<typename...> using __void_t = void;
+
+  // Utility to detect referenceable types ([defns.referenceable]).
+
+  template<typename _Tp, typename = void>
+    struct __is_referenceable
+    : public false_type
+    { };
+
+  template<typename _Tp>
+    struct __is_referenceable<_Tp, __void_t<_Tp&>>
+    : public true_type
+    { };
+
+  // Type properties.
+
+  /// is_const
+  template<typename>
+    struct is_const
+    : public false_type { };
+
+  template<typename _Tp>
+    struct is_const<_Tp const>
+    : public true_type { };
+
+  /// is_volatile
+  template<typename>
+    struct is_volatile
+    : public false_type { };
+
+  template<typename _Tp>
+    struct is_volatile<_Tp volatile>
+    : public true_type { };
+
+  /// is_trivial
+  template<typename _Tp>
+    struct is_trivial
+    : public integral_constant<bool, __is_trivial(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  // is_trivially_copyable
+  template<typename _Tp>
+    struct is_trivially_copyable
+    : public integral_constant<bool, __is_trivially_copyable(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_standard_layout
+  template<typename _Tp>
+    struct is_standard_layout
+    : public integral_constant<bool, __is_standard_layout(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_pod (deprecated in C++20)
+  // Could use is_standard_layout && is_trivial instead of the builtin.
+  template<typename _Tp>
+    struct
+    _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead")
+    is_pod
+    : public integral_constant<bool, __is_pod(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_literal_type
+  template<typename _Tp>
+    struct
+    _GLIBCXX17_DEPRECATED
+    is_literal_type
+    : public integral_constant<bool, __is_literal_type(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_empty
+  template<typename _Tp>
+    struct is_empty
+    : public integral_constant<bool, __is_empty(_Tp)>
+    { };
+
+  /// is_polymorphic
+  template<typename _Tp>
+    struct is_polymorphic
+    : public integral_constant<bool, __is_polymorphic(_Tp)>
+    { };
+
+
+#define __cpp_lib_is_final 201402L
+  /// is_final
+  template<typename _Tp>
+    struct is_final
+    : public integral_constant<bool, __is_final(_Tp)>
+    { };
+
+
+  /// is_abstract
+  template<typename _Tp>
+    struct is_abstract
+    : public integral_constant<bool, __is_abstract(_Tp)>
+    { };
+
+  template<typename _Tp,
+	   bool = is_arithmetic<_Tp>::value>
+    struct __is_signed_helper
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_signed_helper<_Tp, true>
+    : public integral_constant<bool, _Tp(-1) < _Tp(0)>
+    { };
+
+  /// is_signed
+  template<typename _Tp>
+    struct is_signed
+    : public __is_signed_helper<_Tp>::type
+    { };
+
+  /// is_unsigned
+  template<typename _Tp>
+    struct is_unsigned
+    : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
+    { };
+
+
+  // Destructible and constructible type properties.
+
+  /**
+   *  @brief  Utility to simplify expressions used in unevaluated operands
+   *  @ingroup utilities
+   */
+
+  template<typename _Tp, typename _Up = _Tp&&>
+    _Up
+    __declval(int);
+
+  template<typename _Tp>
+    _Tp
+    __declval(long);
+
+  template<typename _Tp>
+    auto declval() noexcept -> decltype(__declval<_Tp>(0));
+
+  template<typename, unsigned = 0>
+    struct extent;
+
+  template<typename>
+    struct remove_all_extents;
+
+  template<typename _Tp>
+    struct __is_array_known_bounds
+    : public integral_constant<bool, (extent<_Tp>::value > 0)>
+    { };
+
+  template<typename _Tp>
+    struct __is_array_unknown_bounds
+    : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
+    { };
+
+  // In N3290 is_destructible does not say anything about function
+  // types and abstract types, see LWG 2049. This implementation
+  // describes function types as non-destructible and all complete
+  // object types as destructible, iff the explicit destructor
+  // call expression is wellformed.
+  struct __do_is_destructible_impl
+  {
+    template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
+      static true_type __test(int);
+
+    template<typename>
+      static false_type __test(...);
+  };
+
+  template<typename _Tp>
+    struct __is_destructible_impl
+    : public __do_is_destructible_impl
+    {
+      typedef decltype(__test<_Tp>(0)) type;
+    };
+
+  template<typename _Tp,
+           bool = __or_<is_void<_Tp>,
+                        __is_array_unknown_bounds<_Tp>,
+                        is_function<_Tp>>::value,
+           bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
+    struct __is_destructible_safe;
+
+  template<typename _Tp>
+    struct __is_destructible_safe<_Tp, false, false>
+    : public __is_destructible_impl<typename
+               remove_all_extents<_Tp>::type>::type
+    { };
+
+  template<typename _Tp>
+    struct __is_destructible_safe<_Tp, true, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_destructible_safe<_Tp, false, true>
+    : public true_type { };
+
+  /// is_destructible
+  template<typename _Tp>
+    struct is_destructible
+    : public __is_destructible_safe<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  // is_nothrow_destructible requires that is_destructible is
+  // satisfied as well.  We realize that by mimicing the
+  // implementation of is_destructible but refer to noexcept(expr)
+  // instead of decltype(expr).
+  struct __do_is_nt_destructible_impl
+  {
+    template<typename _Tp>
+      static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
+      __test(int);
+
+    template<typename>
+      static false_type __test(...);
+  };
+
+  template<typename _Tp>
+    struct __is_nt_destructible_impl
+    : public __do_is_nt_destructible_impl
+    {
+      typedef decltype(__test<_Tp>(0)) type;
+    };
+
+  template<typename _Tp,
+           bool = __or_<is_void<_Tp>,
+                        __is_array_unknown_bounds<_Tp>,
+                        is_function<_Tp>>::value,
+           bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
+    struct __is_nt_destructible_safe;
+
+  template<typename _Tp>
+    struct __is_nt_destructible_safe<_Tp, false, false>
+    : public __is_nt_destructible_impl<typename
+               remove_all_extents<_Tp>::type>::type
+    { };
+
+  template<typename _Tp>
+    struct __is_nt_destructible_safe<_Tp, true, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_nt_destructible_safe<_Tp, false, true>
+    : public true_type { };
+
+  /// is_nothrow_destructible
+  template<typename _Tp>
+    struct is_nothrow_destructible
+    : public __is_nt_destructible_safe<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, typename... _Args>
+    struct __is_constructible_impl
+    : public __bool_constant<__is_constructible(_Tp, _Args...)>
+    { };
+
+  /// is_constructible
+  template<typename _Tp, typename... _Args>
+    struct is_constructible
+      : public __is_constructible_impl<_Tp, _Args...>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_default_constructible
+  template<typename _Tp>
+    struct is_default_constructible
+    : public __is_constructible_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_copy_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_copy_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_copy_constructible_impl<_Tp, true>
+    : public __is_constructible_impl<_Tp, const _Tp&>
+    { };
+
+  /// is_copy_constructible
+  template<typename _Tp>
+    struct is_copy_constructible
+    : public __is_copy_constructible_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_move_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_move_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_move_constructible_impl<_Tp, true>
+    : public __is_constructible_impl<_Tp, _Tp&&>
+    { };
+
+  /// is_move_constructible
+  template<typename _Tp>
+    struct is_move_constructible
+    : public __is_move_constructible_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, typename... _Args>
+    using __is_nothrow_constructible_impl
+      = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>;
+
+  /// is_nothrow_constructible
+  template<typename _Tp, typename... _Args>
+    struct is_nothrow_constructible
+    : public __is_nothrow_constructible_impl<_Tp, _Args...>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_nothrow_default_constructible
+  template<typename _Tp>
+    struct is_nothrow_default_constructible
+    : public __bool_constant<__is_nothrow_constructible(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_nothrow_copy_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_nothrow_copy_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_nothrow_copy_constructible_impl<_Tp, true>
+    : public __is_nothrow_constructible_impl<_Tp, const _Tp&>
+    { };
+
+  /// is_nothrow_copy_constructible
+  template<typename _Tp>
+    struct is_nothrow_copy_constructible
+    : public __is_nothrow_copy_constructible_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_nothrow_move_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_nothrow_move_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_nothrow_move_constructible_impl<_Tp, true>
+    : public __is_nothrow_constructible_impl<_Tp, _Tp&&>
+    { };
+
+  /// is_nothrow_move_constructible
+  template<typename _Tp>
+    struct is_nothrow_move_constructible
+    : public __is_nothrow_move_constructible_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_assignable
+  template<typename _Tp, typename _Up>
+    struct is_assignable
+    : public __bool_constant<__is_assignable(_Tp, _Up)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_copy_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_copy_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_copy_assignable_impl<_Tp, true>
+    : public __bool_constant<__is_assignable(_Tp&, const _Tp&)>
+    { };
+
+  /// is_copy_assignable
+  template<typename _Tp>
+    struct is_copy_assignable
+    : public __is_copy_assignable_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_move_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_move_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_move_assignable_impl<_Tp, true>
+    : public __bool_constant<__is_assignable(_Tp&, _Tp&&)>
+    { };
+
+  /// is_move_assignable
+  template<typename _Tp>
+    struct is_move_assignable
+    : public __is_move_assignable_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, typename _Up>
+    using __is_nothrow_assignable_impl
+      = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>;
+
+  /// is_nothrow_assignable
+  template<typename _Tp, typename _Up>
+    struct is_nothrow_assignable
+    : public __is_nothrow_assignable_impl<_Tp, _Up>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_nt_copy_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_nt_copy_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_nt_copy_assignable_impl<_Tp, true>
+    : public __is_nothrow_assignable_impl<_Tp&, const _Tp&>
+    { };
+
+  /// is_nothrow_copy_assignable
+  template<typename _Tp>
+    struct is_nothrow_copy_assignable
+    : public __is_nt_copy_assignable_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_nt_move_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_nt_move_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_nt_move_assignable_impl<_Tp, true>
+    : public __is_nothrow_assignable_impl<_Tp&, _Tp&&>
+    { };
+
+  /// is_nothrow_move_assignable
+  template<typename _Tp>
+    struct is_nothrow_move_assignable
+    : public __is_nt_move_assignable_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_trivially_constructible
+  template<typename _Tp, typename... _Args>
+    struct is_trivially_constructible
+    : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_trivially_default_constructible
+  template<typename _Tp>
+    struct is_trivially_default_constructible
+    : public __bool_constant<__is_trivially_constructible(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  struct __do_is_implicitly_default_constructible_impl
+  {
+    template <typename _Tp>
+    static void __helper(const _Tp&);
+
+    template <typename _Tp>
+    static true_type __test(const _Tp&,
+                            decltype(__helper<const _Tp&>({}))* = 0);
+
+    static false_type __test(...);
+  };
+
+  template<typename _Tp>
+    struct __is_implicitly_default_constructible_impl
+    : public __do_is_implicitly_default_constructible_impl
+    {
+      typedef decltype(__test(declval<_Tp>())) type;
+    };
+
+  template<typename _Tp>
+    struct __is_implicitly_default_constructible_safe
+    : public __is_implicitly_default_constructible_impl<_Tp>::type
+    { };
+
+  template <typename _Tp>
+    struct __is_implicitly_default_constructible
+    : public __and_<__is_constructible_impl<_Tp>,
+		    __is_implicitly_default_constructible_safe<_Tp>>
+    { };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_trivially_copy_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_trivially_copy_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_trivially_copy_constructible_impl<_Tp, true>
+    : public __and_<__is_copy_constructible_impl<_Tp>,
+		    integral_constant<bool,
+			__is_trivially_constructible(_Tp, const _Tp&)>>
+    { };
+
+  /// is_trivially_copy_constructible
+  template<typename _Tp>
+    struct is_trivially_copy_constructible
+    : public __is_trivially_copy_constructible_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_trivially_move_constructible_impl;
+
+  template<typename _Tp>
+    struct __is_trivially_move_constructible_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_trivially_move_constructible_impl<_Tp, true>
+    : public __and_<__is_move_constructible_impl<_Tp>,
+		    integral_constant<bool,
+			__is_trivially_constructible(_Tp, _Tp&&)>>
+    { };
+
+  /// is_trivially_move_constructible
+  template<typename _Tp>
+    struct is_trivially_move_constructible
+    : public __is_trivially_move_constructible_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_trivially_assignable
+  template<typename _Tp, typename _Up>
+    struct is_trivially_assignable
+    : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_trivially_copy_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_trivially_copy_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_trivially_copy_assignable_impl<_Tp, true>
+    : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
+    { };
+
+  /// is_trivially_copy_assignable
+  template<typename _Tp>
+    struct is_trivially_copy_assignable
+    : public __is_trivially_copy_assignable_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __is_trivially_move_assignable_impl;
+
+  template<typename _Tp>
+    struct __is_trivially_move_assignable_impl<_Tp, false>
+    : public false_type { };
+
+  template<typename _Tp>
+    struct __is_trivially_move_assignable_impl<_Tp, true>
+    : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
+    { };
+
+  /// is_trivially_move_assignable
+  template<typename _Tp>
+    struct is_trivially_move_assignable
+    : public __is_trivially_move_assignable_impl<_Tp>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_trivially_destructible
+  template<typename _Tp>
+    struct is_trivially_destructible
+    : public __and_<__is_destructible_safe<_Tp>,
+		    __bool_constant<__has_trivial_destructor(_Tp)>>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+
+  /// has_virtual_destructor
+  template<typename _Tp>
+    struct has_virtual_destructor
+    : public integral_constant<bool, __has_virtual_destructor(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+
+  // type property queries.
+
+  /// alignment_of
+  template<typename _Tp>
+    struct alignment_of
+    : public integral_constant<std::size_t, alignof(_Tp)>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// rank
+  template<typename>
+    struct rank
+    : public integral_constant<std::size_t, 0> { };
+
+  template<typename _Tp, std::size_t _Size>
+    struct rank<_Tp[_Size]>
+    : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
+
+  template<typename _Tp>
+    struct rank<_Tp[]>
+    : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
+
+  /// extent
+  template<typename, unsigned _Uint>
+    struct extent
+    : public integral_constant<std::size_t, 0> { };
+
+  template<typename _Tp, unsigned _Uint, std::size_t _Size>
+    struct extent<_Tp[_Size], _Uint>
+    : public integral_constant<std::size_t,
+			       _Uint == 0 ? _Size : extent<_Tp,
+							   _Uint - 1>::value>
+    { };
+
+  template<typename _Tp, unsigned _Uint>
+    struct extent<_Tp[], _Uint>
+    : public integral_constant<std::size_t,
+			       _Uint == 0 ? 0 : extent<_Tp,
+						       _Uint - 1>::value>
+    { };
+
+
+  // Type relations.
+
+  /// is_same
+  template<typename _Tp, typename _Up>
+    struct is_same
+
+    : public integral_constant<bool, __is_same(_Tp, _Up)>
+
+
+
+    { };
+
+
+
+
+
+
+
+
+  /// is_base_of
+  template<typename _Base, typename _Derived>
+    struct is_base_of
+    : public integral_constant<bool, __is_base_of(_Base, _Derived)>
+    { };
+
+  template<typename _From, typename _To,
+           bool = __or_<is_void<_From>, is_function<_To>,
+                        is_array<_To>>::value>
+    struct __is_convertible_helper
+    {
+      typedef typename is_void<_To>::type type;
+    };
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
+  template<typename _From, typename _To>
+    class __is_convertible_helper<_From, _To, false>
+    {
+      template<typename _To1>
+	static void __test_aux(_To1) noexcept;
+
+      template<typename _From1, typename _To1,
+	       typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
+	static true_type
+	__test(int);
+
+      template<typename, typename>
+	static false_type
+	__test(...);
+
+    public:
+      typedef decltype(__test<_From, _To>(0)) type;
+    };
+#pragma GCC diagnostic pop
+
+  /// is_convertible
+  template<typename _From, typename _To>
+    struct is_convertible
+    : public __is_convertible_helper<_From, _To>::type
+    { };
+
+  // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N>
+  template<typename _ToElementType, typename _FromElementType>
+    using __is_array_convertible
+      = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>;
+
+  template<typename _From, typename _To,
+           bool = __or_<is_void<_From>, is_function<_To>,
+                        is_array<_To>>::value>
+    struct __is_nt_convertible_helper
+    : is_void<_To>
+    { };
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
+  template<typename _From, typename _To>
+    class __is_nt_convertible_helper<_From, _To, false>
+    {
+      template<typename _To1>
+	static void __test_aux(_To1) noexcept;
+
+      template<typename _From1, typename _To1>
+	static
+	__bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
+	__test(int);
+
+      template<typename, typename>
+	static false_type
+	__test(...);
+
+    public:
+      using type = decltype(__test<_From, _To>(0));
+    };
+#pragma GCC diagnostic pop
+
+  // is_nothrow_convertible for C++11
+  template<typename _From, typename _To>
+    struct __is_nothrow_convertible
+    : public __is_nt_convertible_helper<_From, _To>::type
+    { };
+
+
+  // Const-volatile modifications.
+
+  /// remove_const
+  template<typename _Tp>
+    struct remove_const
+    { typedef _Tp     type; };
+
+  template<typename _Tp>
+    struct remove_const<_Tp const>
+    { typedef _Tp     type; };
+
+  /// remove_volatile
+  template<typename _Tp>
+    struct remove_volatile
+    { typedef _Tp     type; };
+
+  template<typename _Tp>
+    struct remove_volatile<_Tp volatile>
+    { typedef _Tp     type; };
+
+  /// remove_cv
+  template<typename _Tp>
+    struct remove_cv
+    { using type = _Tp; };
+
+  template<typename _Tp>
+    struct remove_cv<const _Tp>
+    { using type = _Tp; };
+
+  template<typename _Tp>
+    struct remove_cv<volatile _Tp>
+    { using type = _Tp; };
+
+  template<typename _Tp>
+    struct remove_cv<const volatile _Tp>
+    { using type = _Tp; };
+
+  /// add_const
+  template<typename _Tp>
+    struct add_const
+    { typedef _Tp const     type; };
+
+  /// add_volatile
+  template<typename _Tp>
+    struct add_volatile
+    { typedef _Tp volatile     type; };
+
+  /// add_cv
+  template<typename _Tp>
+    struct add_cv
+    {
+      typedef typename
+      add_const<typename add_volatile<_Tp>::type>::type     type;
+    };
+
+
+
+#define __cpp_lib_transformation_trait_aliases 201304
+
+  /// Alias template for remove_const
+  template<typename _Tp>
+    using remove_const_t = typename remove_const<_Tp>::type;
+
+  /// Alias template for remove_volatile
+  template<typename _Tp>
+    using remove_volatile_t = typename remove_volatile<_Tp>::type;
+
+  /// Alias template for remove_cv
+  template<typename _Tp>
+    using remove_cv_t = typename remove_cv<_Tp>::type;
+
+  /// Alias template for add_const
+  template<typename _Tp>
+    using add_const_t = typename add_const<_Tp>::type;
+
+  /// Alias template for add_volatile
+  template<typename _Tp>
+    using add_volatile_t = typename add_volatile<_Tp>::type;
+
+  /// Alias template for add_cv
+  template<typename _Tp>
+    using add_cv_t = typename add_cv<_Tp>::type;
+
+
+  // Reference transformations.
+
+  /// remove_reference
+  template<typename _Tp>
+    struct remove_reference
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct remove_reference<_Tp&>
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct remove_reference<_Tp&&>
+    { typedef _Tp   type; };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __add_lvalue_reference_helper
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct __add_lvalue_reference_helper<_Tp, true>
+    { typedef _Tp&   type; };
+
+  /// add_lvalue_reference
+  template<typename _Tp>
+    struct add_lvalue_reference
+    : public __add_lvalue_reference_helper<_Tp>
+    { };
+
+  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
+    struct __add_rvalue_reference_helper
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct __add_rvalue_reference_helper<_Tp, true>
+    { typedef _Tp&&   type; };
+
+  /// add_rvalue_reference
+  template<typename _Tp>
+    struct add_rvalue_reference
+    : public __add_rvalue_reference_helper<_Tp>
+    { };
+
+
+  /// Alias template for remove_reference
+  template<typename _Tp>
+    using remove_reference_t = typename remove_reference<_Tp>::type;
+
+  /// Alias template for add_lvalue_reference
+  template<typename _Tp>
+    using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
+
+  /// Alias template for add_rvalue_reference
+  template<typename _Tp>
+    using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
+
+
+  // Sign modifications.
+
+  // Utility for constructing identically cv-qualified types.
+  template<typename _Unqualified, bool _IsConst, bool _IsVol>
+    struct __cv_selector;
+
+  template<typename _Unqualified>
+    struct __cv_selector<_Unqualified, false, false>
+    { typedef _Unqualified __type; };
+
+  template<typename _Unqualified>
+    struct __cv_selector<_Unqualified, false, true>
+    { typedef volatile _Unqualified __type; };
+
+  template<typename _Unqualified>
+    struct __cv_selector<_Unqualified, true, false>
+    { typedef const _Unqualified __type; };
+
+  template<typename _Unqualified>
+    struct __cv_selector<_Unqualified, true, true>
+    { typedef const volatile _Unqualified __type; };
+
+  template<typename _Qualified, typename _Unqualified,
+	   bool _IsConst = is_const<_Qualified>::value,
+	   bool _IsVol = is_volatile<_Qualified>::value>
+    class __match_cv_qualifiers
+    {
+      typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
+
+    public:
+      typedef typename __match::__type __type;
+    };
+
+  // Utility for finding the unsigned versions of signed integral types.
+  template<typename _Tp>
+    struct __make_unsigned
+    { typedef _Tp __type; };
+
+  template<>
+    struct __make_unsigned<char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __make_unsigned<signed char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __make_unsigned<short>
+    { typedef unsigned short __type; };
+
+  template<>
+    struct __make_unsigned<int>
+    { typedef unsigned int __type; };
+
+  template<>
+    struct __make_unsigned<long>
+    { typedef unsigned long __type; };
+
+  template<>
+    struct __make_unsigned<long long>
+    { typedef unsigned long long __type; };
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+  // Select between integral and enum: not possible to be both.
+  template<typename _Tp,
+	   bool _IsInt = is_integral<_Tp>::value,
+	   bool _IsEnum = is_enum<_Tp>::value>
+    class __make_unsigned_selector;
+
+  template<typename _Tp>
+    class __make_unsigned_selector<_Tp, true, false>
+    {
+      using __unsigned_type
+	= typename __make_unsigned<__remove_cv_t<_Tp>>::__type;
+
+    public:
+      using __type
+	= typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
+    };
+
+  class __make_unsigned_selector_base
+  {
+  protected:
+    template<typename...> struct _List { };
+
+    template<typename _Tp, typename... _Up>
+      struct _List<_Tp, _Up...> : _List<_Up...>
+      { static constexpr size_t __size = sizeof(_Tp); };
+
+    template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
+      struct __select;
+
+    template<size_t _Sz, typename _Uint, typename... _UInts>
+      struct __select<_Sz, _List<_Uint, _UInts...>, true>
+      { using __type = _Uint; };
+
+    template<size_t _Sz, typename _Uint, typename... _UInts>
+      struct __select<_Sz, _List<_Uint, _UInts...>, false>
+      : __select<_Sz, _List<_UInts...>>
+      { };
+  };
+
+  // Choose unsigned integer type with the smallest rank and same size as _Tp
+  template<typename _Tp>
+    class __make_unsigned_selector<_Tp, false, true>
+    : __make_unsigned_selector_base
+    {
+      // With -fshort-enums, an enum may be as small as a char.
+      using _UInts = _List<unsigned char, unsigned short, unsigned int,
+			   unsigned long, unsigned long long>;
+
+      using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
+
+    public:
+      using __type
+	= typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
+    };
+
+  // wchar_t, char8_t, char16_t and char32_t are integral types but are
+  // neither signed integer types nor unsigned integer types, so must be
+  // transformed to the unsigned integer type with the smallest rank.
+  // Use the partial specialization for enumeration types to do that.
+
+  template<>
+    struct __make_unsigned<wchar_t>
+    {
+      using __type
+	= typename __make_unsigned_selector<wchar_t, false, true>::__type;
+    };
+
+
+
+  template<>
+    struct __make_unsigned<char16_t>
+    {
+      using __type
+	= typename __make_unsigned_selector<char16_t, false, true>::__type;
+    };
+
+  template<>
+    struct __make_unsigned<char32_t>
+    {
+      using __type
+	= typename __make_unsigned_selector<char32_t, false, true>::__type;
+    };
+
+  // Given an integral/enum type, return the corresponding unsigned
+  // integer type.
+  // Primary template.
+  /// make_unsigned
+  template<typename _Tp>
+    struct make_unsigned
+    { typedef typename __make_unsigned_selector<_Tp>::__type type; };
+
+  // Integral, but don't define.
+  template<>
+    struct make_unsigned<bool>;
+
+
+  // Utility for finding the signed versions of unsigned integral types.
+  template<typename _Tp>
+    struct __make_signed
+    { typedef _Tp __type; };
+
+  template<>
+    struct __make_signed<char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __make_signed<unsigned char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __make_signed<unsigned short>
+    { typedef signed short __type; };
+
+  template<>
+    struct __make_signed<unsigned int>
+    { typedef signed int __type; };
+
+  template<>
+    struct __make_signed<unsigned long>
+    { typedef signed long __type; };
+
+  template<>
+    struct __make_signed<unsigned long long>
+    { typedef signed long long __type; };
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+  // Select between integral and enum: not possible to be both.
+  template<typename _Tp,
+	   bool _IsInt = is_integral<_Tp>::value,
+	   bool _IsEnum = is_enum<_Tp>::value>
+    class __make_signed_selector;
+
+  template<typename _Tp>
+    class __make_signed_selector<_Tp, true, false>
+    {
+      using __signed_type
+	= typename __make_signed<__remove_cv_t<_Tp>>::__type;
+
+    public:
+      using __type
+	= typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
+    };
+
+  // Choose signed integer type with the smallest rank and same size as _Tp
+  template<typename _Tp>
+    class __make_signed_selector<_Tp, false, true>
+    {
+      typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
+
+    public:
+      typedef typename __make_signed_selector<__unsigned_type>::__type __type;
+    };
+
+  // wchar_t, char16_t and char32_t are integral types but are neither
+  // signed integer types nor unsigned integer types, so must be
+  // transformed to the signed integer type with the smallest rank.
+  // Use the partial specialization for enumeration types to do that.
+
+  template<>
+    struct __make_signed<wchar_t>
+    {
+      using __type
+	= typename __make_signed_selector<wchar_t, false, true>::__type;
+    };
+
+
+
+  template<>
+    struct __make_signed<char16_t>
+    {
+      using __type
+	= typename __make_signed_selector<char16_t, false, true>::__type;
+    };
+
+  template<>
+    struct __make_signed<char32_t>
+    {
+      using __type
+	= typename __make_signed_selector<char32_t, false, true>::__type;
+    };
+
+  // Given an integral/enum type, return the corresponding signed
+  // integer type.
+  // Primary template.
+  /// make_signed
+  template<typename _Tp>
+    struct make_signed
+    { typedef typename __make_signed_selector<_Tp>::__type type; };
+
+  // Integral, but don't define.
+  template<>
+    struct make_signed<bool>;
+
+
+  /// Alias template for make_signed
+  template<typename _Tp>
+    using make_signed_t = typename make_signed<_Tp>::type;
+
+  /// Alias template for make_unsigned
+  template<typename _Tp>
+    using make_unsigned_t = typename make_unsigned<_Tp>::type;
+
+
+  // Array modifications.
+
+  /// remove_extent
+  template<typename _Tp>
+    struct remove_extent
+    { typedef _Tp     type; };
+
+  template<typename _Tp, std::size_t _Size>
+    struct remove_extent<_Tp[_Size]>
+    { typedef _Tp     type; };
+
+  template<typename _Tp>
+    struct remove_extent<_Tp[]>
+    { typedef _Tp     type; };
+
+  /// remove_all_extents
+  template<typename _Tp>
+    struct remove_all_extents
+    { typedef _Tp     type; };
+
+  template<typename _Tp, std::size_t _Size>
+    struct remove_all_extents<_Tp[_Size]>
+    { typedef typename remove_all_extents<_Tp>::type     type; };
+
+  template<typename _Tp>
+    struct remove_all_extents<_Tp[]>
+    { typedef typename remove_all_extents<_Tp>::type     type; };
+
+
+  /// Alias template for remove_extent
+  template<typename _Tp>
+    using remove_extent_t = typename remove_extent<_Tp>::type;
+
+  /// Alias template for remove_all_extents
+  template<typename _Tp>
+    using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
+
+
+  // Pointer modifications.
+
+  template<typename _Tp, typename>
+    struct __remove_pointer_helper
+    { typedef _Tp     type; };
+
+  template<typename _Tp, typename _Up>
+    struct __remove_pointer_helper<_Tp, _Up*>
+    { typedef _Up     type; };
+
+  /// remove_pointer
+  template<typename _Tp>
+    struct remove_pointer
+    : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>>
+    { };
+
+  /// add_pointer
+  template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
+				      is_void<_Tp>>::value>
+    struct __add_pointer_helper
+    { typedef _Tp     type; };
+
+  template<typename _Tp>
+    struct __add_pointer_helper<_Tp, true>
+    { typedef typename remove_reference<_Tp>::type*     type; };
+
+  template<typename _Tp>
+    struct add_pointer
+    : public __add_pointer_helper<_Tp>
+    { };
+
+
+  /// Alias template for remove_pointer
+  template<typename _Tp>
+    using remove_pointer_t = typename remove_pointer<_Tp>::type;
+
+  /// Alias template for add_pointer
+  template<typename _Tp>
+    using add_pointer_t = typename add_pointer<_Tp>::type;
+
+
+  template<std::size_t _Len>
+    struct __aligned_storage_msa
+    {
+      union __type
+      {
+	unsigned char __data[_Len];
+	struct __attribute__((__aligned__)) { } __align;
+      };
+    };
+
+  /**
+   *  @brief Alignment type.
+   *
+   *  The value of _Align is a default-alignment which shall be the
+   *  most stringent alignment requirement for any C++ object type
+   *  whose size is no greater than _Len (3.9). The member typedef
+   *  type shall be a POD type suitable for use as uninitialized
+   *  storage for any object whose size is at most _Len and whose
+   *  alignment is a divisor of _Align.
+  */
+  template<std::size_t _Len, std::size_t _Align =
+	   __alignof__(typename __aligned_storage_msa<_Len>::__type)>
+    struct aligned_storage
+    {
+      union type
+      {
+	unsigned char __data[_Len];
+	struct __attribute__((__aligned__((_Align)))) { } __align;
+      };
+    };
+
+  template <typename... _Types>
+    struct __strictest_alignment
+    {
+      static const size_t _S_alignment = 0;
+      static const size_t _S_size = 0;
+    };
+
+  template <typename _Tp, typename... _Types>
+    struct __strictest_alignment<_Tp, _Types...>
+    {
+      static const size_t _S_alignment =
+        alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
+	? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
+      static const size_t _S_size =
+        sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
+	? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
+    };
+
+  /**
+   *  @brief Provide aligned storage for types.
+   *
+   *  [meta.trans.other]
+   *
+   *  Provides aligned storage for any of the provided types of at
+   *  least size _Len.
+   *
+   *  @see aligned_storage
+   */
+  template <size_t _Len, typename... _Types>
+    struct aligned_union
+    {
+    private:
+      static_assert(sizeof...(_Types) != 0, "At least one type is required");
+
+      using __strictest = __strictest_alignment<_Types...>;
+      static const size_t _S_len = _Len > __strictest::_S_size
+	? _Len : __strictest::_S_size;
+    public:
+      /// The value of the strictest alignment of _Types.
+      static const size_t alignment_value = __strictest::_S_alignment;
+      /// The storage.
+      typedef typename aligned_storage<_S_len, alignment_value>::type type;
+    };
+
+  template <size_t _Len, typename... _Types>
+    const size_t aligned_union<_Len, _Types...>::alignment_value;
+
+  // Decay trait for arrays and functions, used for perfect forwarding
+  // in make_pair, make_tuple, etc.
+  template<typename _Up,
+	   bool _IsArray = is_array<_Up>::value,
+	   bool _IsFunction = is_function<_Up>::value>
+    struct __decay_selector;
+
+  // NB: DR 705.
+  template<typename _Up>
+    struct __decay_selector<_Up, false, false>
+    { typedef __remove_cv_t<_Up> __type; };
+
+  template<typename _Up>
+    struct __decay_selector<_Up, true, false>
+    { typedef typename remove_extent<_Up>::type* __type; };
+
+  template<typename _Up>
+    struct __decay_selector<_Up, false, true>
+    { typedef typename add_pointer<_Up>::type __type; };
+
+  /// decay
+  template<typename _Tp>
+    class decay
+    {
+      typedef typename remove_reference<_Tp>::type __remove_type;
+
+    public:
+      typedef typename __decay_selector<__remove_type>::__type type;
+    };
+
+  // __decay_t (std::decay_t for C++11).
+  template<typename _Tp>
+    using __decay_t = typename decay<_Tp>::type;
+
+  template<typename _Tp>
+    class reference_wrapper;
+
+  // Helper which adds a reference to a type when given a reference_wrapper
+  template<typename _Tp>
+    struct __strip_reference_wrapper
+    {
+      typedef _Tp __type;
+    };
+
+  template<typename _Tp>
+    struct __strip_reference_wrapper<reference_wrapper<_Tp> >
+    {
+      typedef _Tp& __type;
+    };
+
+  template<typename _Tp>
+    using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>;
+
+
+  // Primary template.
+  /// Define a member typedef @c type only if a boolean constant is true.
+  template<bool, typename _Tp = void>
+    struct enable_if
+    { };
+
+  // Partial specialization for true.
+  template<typename _Tp>
+    struct enable_if<true, _Tp>
+    { typedef _Tp type; };
+
+  // __enable_if_t (std::enable_if_t for C++11)
+  template<bool _Cond, typename _Tp = void>
+    using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
+
+  template<typename... _Cond>
+    using _Require = __enable_if_t<__and_<_Cond...>::value>;
+
+  // Primary template.
+  /// Define a member typedef @c type to one of two argument types.
+  template<bool _Cond, typename _Iftrue, typename _Iffalse>
+    struct conditional
+    { typedef _Iftrue type; };
+
+  // Partial specialization for false.
+  template<typename _Iftrue, typename _Iffalse>
+    struct conditional<false, _Iftrue, _Iffalse>
+    { typedef _Iffalse type; };
+
+  // __remove_cvref_t (std::remove_cvref_t for C++11).
+  template<typename _Tp>
+    using __remove_cvref_t
+     = typename remove_cv<typename remove_reference<_Tp>::type>::type;
+
+  /// common_type
+  template<typename... _Tp>
+    struct common_type;
+
+  // Sfinae-friendly common_type implementation:
+
+  struct __do_common_type_impl
+  {
+    template<typename _Tp, typename _Up>
+      using __cond_t
+	= decltype(true ? std::declval<_Tp>() : std::declval<_Up>());
+
+    // if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
+    // denotes a valid type, let C denote that type.
+    template<typename _Tp, typename _Up>
+      static __success_type<__decay_t<__cond_t<_Tp, _Up>>>
+      _S_test(int);
+
+
+
+
+
+
+
+
+
+    template<typename, typename>
+      static __failure_type
+      _S_test_2(...);
+
+    template<typename _Tp, typename _Up>
+      static decltype(_S_test_2<_Tp, _Up>(0))
+      _S_test(...);
+  };
+
+  // If sizeof...(T) is zero, there shall be no member type.
+  template<>
+    struct common_type<>
+    { };
+
+  // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>.
+  template<typename _Tp0>
+    struct common_type<_Tp0>
+    : public common_type<_Tp0, _Tp0>
+    { };
+
+  // If sizeof...(T) is two, ...
+  template<typename _Tp1, typename _Tp2,
+	   typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>>
+    struct __common_type_impl
+    {
+      // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false,
+      // let C denote the same type, if any, as common_type_t<D1, D2>.
+      using type = common_type<_Dp1, _Dp2>;
+    };
+
+  template<typename _Tp1, typename _Tp2>
+    struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2>
+    : private __do_common_type_impl
+    {
+      // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
+      // denotes a valid type, let C denote that type.
+      using type = decltype(_S_test<_Tp1, _Tp2>(0));
+    };
+
+  // If sizeof...(T) is two, ...
+  template<typename _Tp1, typename _Tp2>
+    struct common_type<_Tp1, _Tp2>
+    : public __common_type_impl<_Tp1, _Tp2>::type
+    { };
+
+  template<typename...>
+    struct __common_type_pack
+    { };
+
+  template<typename, typename, typename = void>
+    struct __common_type_fold;
+
+  // If sizeof...(T) is greater than two, ...
+  template<typename _Tp1, typename _Tp2, typename... _Rp>
+    struct common_type<_Tp1, _Tp2, _Rp...>
+    : public __common_type_fold<common_type<_Tp1, _Tp2>,
+				__common_type_pack<_Rp...>>
+    { };
+
+  // Let C denote the same type, if any, as common_type_t<T1, T2>.
+  // If there is such a type C, type shall denote the same type, if any,
+  // as common_type_t<C, R...>.
+  template<typename _CTp, typename... _Rp>
+    struct __common_type_fold<_CTp, __common_type_pack<_Rp...>,
+			      __void_t<typename _CTp::type>>
+    : public common_type<typename _CTp::type, _Rp...>
+    { };
+
+  // Otherwise, there shall be no member type.
+  template<typename _CTp, typename _Rp>
+    struct __common_type_fold<_CTp, _Rp, void>
+    { };
+
+  template<typename _Tp, bool = is_enum<_Tp>::value>
+    struct __underlying_type_impl
+    {
+      using type = __underlying_type(_Tp);
+    };
+
+  template<typename _Tp>
+    struct __underlying_type_impl<_Tp, false>
+    { };
+
+  /// The underlying type of an enum.
+  template<typename _Tp>
+    struct underlying_type
+    : public __underlying_type_impl<_Tp>
+    { };
+
+  template<typename _Tp>
+    struct __declval_protector
+    {
+      static const bool __stop = false;
+    };
+
+  template<typename _Tp>
+    auto declval() noexcept -> decltype(__declval<_Tp>(0))
+    {
+      static_assert(__declval_protector<_Tp>::__stop,
+		    "declval() must not be used!");
+      return __declval<_Tp>(0);
+    }
+
+  /// result_of
+  template<typename _Signature>
+    struct result_of;
+
+  // Sfinae-friendly result_of implementation:
+
+#define __cpp_lib_result_of_sfinae 201210
+
+  struct __invoke_memfun_ref { };
+  struct __invoke_memfun_deref { };
+  struct __invoke_memobj_ref { };
+  struct __invoke_memobj_deref { };
+  struct __invoke_other { };
+
+  // Associate a tag type with a specialization of __success_type.
+  template<typename _Tp, typename _Tag>
+    struct __result_of_success : __success_type<_Tp>
+    { using __invoke_type = _Tag; };
+
+  // [func.require] paragraph 1 bullet 1:
+  struct __result_of_memfun_ref_impl
+  {
+    template<typename _Fp, typename _Tp1, typename... _Args>
+      static __result_of_success<decltype(
+      (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
+      ), __invoke_memfun_ref> _S_test(int);
+
+    template<typename...>
+      static __failure_type _S_test(...);
+  };
+
+  template<typename _MemPtr, typename _Arg, typename... _Args>
+    struct __result_of_memfun_ref
+    : private __result_of_memfun_ref_impl
+    {
+      typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
+    };
+
+  // [func.require] paragraph 1 bullet 2:
+  struct __result_of_memfun_deref_impl
+  {
+    template<typename _Fp, typename _Tp1, typename... _Args>
+      static __result_of_success<decltype(
+      ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
+      ), __invoke_memfun_deref> _S_test(int);
+
+    template<typename...>
+      static __failure_type _S_test(...);
+  };
+
+  template<typename _MemPtr, typename _Arg, typename... _Args>
+    struct __result_of_memfun_deref
+    : private __result_of_memfun_deref_impl
+    {
+      typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
+    };
+
+  // [func.require] paragraph 1 bullet 3:
+  struct __result_of_memobj_ref_impl
+  {
+    template<typename _Fp, typename _Tp1>
+      static __result_of_success<decltype(
+      std::declval<_Tp1>().*std::declval<_Fp>()
+      ), __invoke_memobj_ref> _S_test(int);
+
+    template<typename, typename>
+      static __failure_type _S_test(...);
+  };
+
+  template<typename _MemPtr, typename _Arg>
+    struct __result_of_memobj_ref
+    : private __result_of_memobj_ref_impl
+    {
+      typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
+    };
+
+  // [func.require] paragraph 1 bullet 4:
+  struct __result_of_memobj_deref_impl
+  {
+    template<typename _Fp, typename _Tp1>
+      static __result_of_success<decltype(
+      (*std::declval<_Tp1>()).*std::declval<_Fp>()
+      ), __invoke_memobj_deref> _S_test(int);
+
+    template<typename, typename>
+      static __failure_type _S_test(...);
+  };
+
+  template<typename _MemPtr, typename _Arg>
+    struct __result_of_memobj_deref
+    : private __result_of_memobj_deref_impl
+    {
+      typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
+    };
+
+  template<typename _MemPtr, typename _Arg>
+    struct __result_of_memobj;
+
+  template<typename _Res, typename _Class, typename _Arg>
+    struct __result_of_memobj<_Res _Class::*, _Arg>
+    {
+      typedef __remove_cvref_t<_Arg> _Argval;
+      typedef _Res _Class::* _MemPtr;
+      typedef typename conditional<__or_<is_same<_Argval, _Class>,
+        is_base_of<_Class, _Argval>>::value,
+        __result_of_memobj_ref<_MemPtr, _Arg>,
+        __result_of_memobj_deref<_MemPtr, _Arg>
+      >::type::type type;
+    };
+
+  template<typename _MemPtr, typename _Arg, typename... _Args>
+    struct __result_of_memfun;
+
+  template<typename _Res, typename _Class, typename _Arg, typename... _Args>
+    struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
+    {
+      typedef typename remove_reference<_Arg>::type _Argval;
+      typedef _Res _Class::* _MemPtr;
+      typedef typename conditional<is_base_of<_Class, _Argval>::value,
+        __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
+        __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
+      >::type::type type;
+    };
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 2219.  INVOKE-ing a pointer to member with a reference_wrapper
+  //        as the object expression
+
+  // Used by result_of, invoke etc. to unwrap a reference_wrapper.
+  template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
+    struct __inv_unwrap
+    {
+      using type = _Tp;
+    };
+
+  template<typename _Tp, typename _Up>
+    struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
+    {
+      using type = _Up&;
+    };
+
+  template<bool, bool, typename _Functor, typename... _ArgTypes>
+    struct __result_of_impl
+    {
+      typedef __failure_type type;
+    };
+
+  template<typename _MemPtr, typename _Arg>
+    struct __result_of_impl<true, false, _MemPtr, _Arg>
+    : public __result_of_memobj<__decay_t<_MemPtr>,
+				typename __inv_unwrap<_Arg>::type>
+    { };
+
+  template<typename _MemPtr, typename _Arg, typename... _Args>
+    struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
+    : public __result_of_memfun<__decay_t<_MemPtr>,
+				typename __inv_unwrap<_Arg>::type, _Args...>
+    { };
+
+  // [func.require] paragraph 1 bullet 5:
+  struct __result_of_other_impl
+  {
+    template<typename _Fn, typename... _Args>
+      static __result_of_success<decltype(
+      std::declval<_Fn>()(std::declval<_Args>()...)
+      ), __invoke_other> _S_test(int);
+
+    template<typename...>
+      static __failure_type _S_test(...);
+  };
+
+  template<typename _Functor, typename... _ArgTypes>
+    struct __result_of_impl<false, false, _Functor, _ArgTypes...>
+    : private __result_of_other_impl
+    {
+      typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
+    };
+
+  // __invoke_result (std::invoke_result for C++11)
+  template<typename _Functor, typename... _ArgTypes>
+    struct __invoke_result
+    : public __result_of_impl<
+        is_member_object_pointer<
+          typename remove_reference<_Functor>::type
+        >::value,
+        is_member_function_pointer<
+          typename remove_reference<_Functor>::type
+        >::value,
+	_Functor, _ArgTypes...
+      >::type
+    { };
+
+  template<typename _Functor, typename... _ArgTypes>
+    struct result_of<_Functor(_ArgTypes...)>
+    : public __invoke_result<_Functor, _ArgTypes...>
+    { };
+
+
+  /// Alias template for aligned_storage
+  template<size_t _Len, size_t _Align =
+	    __alignof__(typename __aligned_storage_msa<_Len>::__type)>
+    using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
+
+  template <size_t _Len, typename... _Types>
+    using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
+
+  /// Alias template for decay
+  template<typename _Tp>
+    using decay_t = typename decay<_Tp>::type;
+
+  /// Alias template for enable_if
+  template<bool _Cond, typename _Tp = void>
+    using enable_if_t = typename enable_if<_Cond, _Tp>::type;
+
+  /// Alias template for conditional
+  template<bool _Cond, typename _Iftrue, typename _Iffalse>
+    using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
+
+  /// Alias template for common_type
+  template<typename... _Tp>
+    using common_type_t = typename common_type<_Tp...>::type;
+
+  /// Alias template for underlying_type
+  template<typename _Tp>
+    using underlying_type_t = typename underlying_type<_Tp>::type;
+
+  /// Alias template for result_of
+  template<typename _Tp>
+    using result_of_t = typename result_of<_Tp>::type;
+
+
+
+#define __cpp_lib_void_t 201411
+  /// A metafunction that always yields void, used for detecting valid types.
+  template<typename...> using void_t = void;
+
+
+  /// Implementation of the detection idiom (negative case).
+  template<typename _Default, typename _AlwaysVoid,
+	   template<typename...> class _Op, typename... _Args>
+    struct __detector
+    {
+      using value_t = false_type;
+      using type = _Default;
+    };
+
+  /// Implementation of the detection idiom (positive case).
+  template<typename _Default, template<typename...> class _Op,
+	    typename... _Args>
+    struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
+    {
+      using value_t = true_type;
+      using type = _Op<_Args...>;
+    };
+
+  // Detect whether _Op<_Args...> is a valid type, use _Default if not.
+  template<typename _Default, template<typename...> class _Op,
+	   typename... _Args>
+    using __detected_or = __detector<_Default, void, _Op, _Args...>;
+
+  // _Op<_Args...> if that is a valid type, otherwise _Default.
+  template<typename _Default, template<typename...> class _Op,
+	   typename... _Args>
+    using __detected_or_t
+      = typename __detected_or<_Default, _Op, _Args...>::type;
+
+  /// @} group metaprogramming
+
+  /**
+   *  Use SFINAE to determine if the type _Tp has a publicly-accessible
+   *  member type _NTYPE.
+   */
+#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) template<typename _Tp, typename = __void_t<>> struct __has_ ##_NTYPE : false_type { }; template<typename _Tp> struct __has_ ##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> : true_type { };
+
+  template <typename _Tp>
+    struct __is_swappable;
+
+  template <typename _Tp>
+    struct __is_nothrow_swappable;
+
+  template<typename... _Elements>
+    class tuple;
+
+  template<typename>
+    struct __is_tuple_like_impl : false_type
+    { };
+
+  template<typename... _Tps>
+    struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
+    { };
+
+  // Internal type trait that allows us to sfinae-protect tuple_cat.
+  template<typename _Tp>
+    struct __is_tuple_like
+    : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
+    { };
+
+  template<typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline
+    _Require<__not_<__is_tuple_like<_Tp>>,
+	     is_move_constructible<_Tp>,
+	     is_move_assignable<_Tp>>
+    swap(_Tp&, _Tp&)
+    noexcept(__and_<is_nothrow_move_constructible<_Tp>,
+	            is_nothrow_move_assignable<_Tp>>::value);
+
+  template<typename _Tp, size_t _Nm>
+    _GLIBCXX20_CONSTEXPR
+    inline
+    __enable_if_t<__is_swappable<_Tp>::value>
+    swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
+    noexcept(__is_nothrow_swappable<_Tp>::value);
+
+  namespace __swappable_details {
+    using std::swap;
+
+    struct __do_is_swappable_impl
+    {
+      template<typename _Tp, typename
+               = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
+        static true_type __test(int);
+
+      template<typename>
+        static false_type __test(...);
+    };
+
+    struct __do_is_nothrow_swappable_impl
+    {
+      template<typename _Tp>
+        static __bool_constant<
+          noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
+        > __test(int);
+
+      template<typename>
+        static false_type __test(...);
+    };
+
+  } // namespace __swappable_details
+
+  template<typename _Tp>
+    struct __is_swappable_impl
+    : public __swappable_details::__do_is_swappable_impl
+    {
+      typedef decltype(__test<_Tp>(0)) type;
+    };
+
+  template<typename _Tp>
+    struct __is_nothrow_swappable_impl
+    : public __swappable_details::__do_is_nothrow_swappable_impl
+    {
+      typedef decltype(__test<_Tp>(0)) type;
+    };
+
+  template<typename _Tp>
+    struct __is_swappable
+    : public __is_swappable_impl<_Tp>::type
+    { };
+
+  template<typename _Tp>
+    struct __is_nothrow_swappable
+    : public __is_nothrow_swappable_impl<_Tp>::type
+    { };
+
+
+#define __cpp_lib_is_swappable 201603
+  /// Metafunctions used for detecting swappable types: p0185r1
+
+  /// is_swappable
+  template<typename _Tp>
+    struct is_swappable
+    : public __is_swappable_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_nothrow_swappable
+  template<typename _Tp>
+    struct is_nothrow_swappable
+    : public __is_nothrow_swappable_impl<_Tp>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+
+  /// is_swappable_v
+  template<typename _Tp>
+    _GLIBCXX17_INLINE constexpr bool is_swappable_v =
+      is_swappable<_Tp>::value;
+
+  /// is_nothrow_swappable_v
+  template<typename _Tp>
+    _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
+      is_nothrow_swappable<_Tp>::value;
+
+
+  namespace __swappable_with_details {
+    using std::swap;
+
+    struct __do_is_swappable_with_impl
+    {
+      template<typename _Tp, typename _Up, typename
+               = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
+               typename
+               = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
+        static true_type __test(int);
+
+      template<typename, typename>
+        static false_type __test(...);
+    };
+
+    struct __do_is_nothrow_swappable_with_impl
+    {
+      template<typename _Tp, typename _Up>
+        static __bool_constant<
+          noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
+          &&
+          noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
+        > __test(int);
+
+      template<typename, typename>
+        static false_type __test(...);
+    };
+
+  } // namespace __swappable_with_details
+
+  template<typename _Tp, typename _Up>
+    struct __is_swappable_with_impl
+    : public __swappable_with_details::__do_is_swappable_with_impl
+    {
+      typedef decltype(__test<_Tp, _Up>(0)) type;
+    };
+
+  // Optimization for the homogenous lvalue case, not required:
+  template<typename _Tp>
+    struct __is_swappable_with_impl<_Tp&, _Tp&>
+    : public __swappable_details::__do_is_swappable_impl
+    {
+      typedef decltype(__test<_Tp&>(0)) type;
+    };
+
+  template<typename _Tp, typename _Up>
+    struct __is_nothrow_swappable_with_impl
+    : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
+    {
+      typedef decltype(__test<_Tp, _Up>(0)) type;
+    };
+
+  // Optimization for the homogenous lvalue case, not required:
+  template<typename _Tp>
+    struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
+    : public __swappable_details::__do_is_nothrow_swappable_impl
+    {
+      typedef decltype(__test<_Tp&>(0)) type;
+    };
+
+  /// is_swappable_with
+  template<typename _Tp, typename _Up>
+    struct is_swappable_with
+    : public __is_swappable_with_impl<_Tp, _Up>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"first template argument must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}),
+	"second template argument must be a complete class or an unbounded array");
+    };
+
+  /// is_nothrow_swappable_with
+  template<typename _Tp, typename _Up>
+    struct is_nothrow_swappable_with
+    : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"first template argument must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}),
+	"second template argument must be a complete class or an unbounded array");
+    };
+
+
+  /// is_swappable_with_v
+  template<typename _Tp, typename _Up>
+    _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
+      is_swappable_with<_Tp, _Up>::value;
+
+  /// is_nothrow_swappable_with_v
+  template<typename _Tp, typename _Up>
+    _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
+      is_nothrow_swappable_with<_Tp, _Up>::value;
+
+
+
+
+  // __is_invocable (std::is_invocable for C++11)
+
+  // The primary template is used for invalid INVOKE expressions.
+  template<typename _Result, typename _Ret,
+	   bool = is_void<_Ret>::value, typename = void>
+    struct __is_invocable_impl : false_type { };
+
+  // Used for valid INVOKE and INVOKE<void> expressions.
+  template<typename _Result, typename _Ret>
+    struct __is_invocable_impl<_Result, _Ret,
+			       /* is_void<_Ret> = */ true,
+			       __void_t<typename _Result::type>>
+    : true_type
+    { };
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
+  // Used for INVOKE<R> expressions to check the implicit conversion to R.
+  template<typename _Result, typename _Ret>
+    struct __is_invocable_impl<_Result, _Ret,
+			       /* is_void<_Ret> = */ false,
+			       __void_t<typename _Result::type>>
+    {
+    private:
+      // The type of the INVOKE expression.
+      // Unlike declval, this doesn't add_rvalue_reference.
+      static typename _Result::type _S_get();
+
+      template<typename _Tp>
+	static void _S_conv(_Tp);
+
+      // This overload is viable if INVOKE(f, args...) can convert to _Tp.
+      template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))>
+	static true_type
+	_S_test(int);
+
+      template<typename _Tp>
+	static false_type
+	_S_test(...);
+
+    public:
+      using type = decltype(_S_test<_Ret>(1));
+    };
+#pragma GCC diagnostic pop
+
+  template<typename _Fn, typename... _ArgTypes>
+    struct __is_invocable
+    : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
+    { };
+
+  template<typename _Fn, typename _Tp, typename... _Args>
+    constexpr bool __call_is_nt(__invoke_memfun_ref)
+    {
+      using _Up = typename __inv_unwrap<_Tp>::type;
+      return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
+	    std::declval<_Args>()...));
+    }
+
+  template<typename _Fn, typename _Tp, typename... _Args>
+    constexpr bool __call_is_nt(__invoke_memfun_deref)
+    {
+      return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
+	    std::declval<_Args>()...));
+    }
+
+  template<typename _Fn, typename _Tp>
+    constexpr bool __call_is_nt(__invoke_memobj_ref)
+    {
+      using _Up = typename __inv_unwrap<_Tp>::type;
+      return noexcept(std::declval<_Up>().*std::declval<_Fn>());
+    }
+
+  template<typename _Fn, typename _Tp>
+    constexpr bool __call_is_nt(__invoke_memobj_deref)
+    {
+      return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
+    }
+
+  template<typename _Fn, typename... _Args>
+    constexpr bool __call_is_nt(__invoke_other)
+    {
+      return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
+    }
+
+  template<typename _Result, typename _Fn, typename... _Args>
+    struct __call_is_nothrow
+    : __bool_constant<
+	std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
+      >
+    { };
+
+  template<typename _Fn, typename... _Args>
+    using __call_is_nothrow_
+      = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
+
+  // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
+  template<typename _Fn, typename... _Args>
+    struct __is_nothrow_invocable
+    : __and_<__is_invocable<_Fn, _Args...>,
+             __call_is_nothrow_<_Fn, _Args...>>::type
+    { };
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
+  struct __nonesuchbase {};
+  struct __nonesuch : private __nonesuchbase {
+    ~__nonesuch() = delete;
+    __nonesuch(__nonesuch const&) = delete;
+    void operator=(__nonesuch const&) = delete;
+  };
+#pragma GCC diagnostic pop
+
+
+#define __cpp_lib_is_invocable 201703
+
+  /// std::invoke_result
+  template<typename _Functor, typename... _ArgTypes>
+    struct invoke_result
+    : public __invoke_result<_Functor, _ArgTypes...>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}),
+	"_Functor must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+    };
+
+  /// std::invoke_result_t
+  template<typename _Fn, typename... _Args>
+    using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
+
+  /// std::is_invocable
+  template<typename _Fn, typename... _ArgTypes>
+    struct is_invocable
+    : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
+	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+    };
+
+  /// std::is_invocable_r
+  template<typename _Ret, typename _Fn, typename... _ArgTypes>
+    struct is_invocable_r
+    : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
+	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}),
+	"_Ret must be a complete class or an unbounded array");
+    };
+
+  /// std::is_nothrow_invocable
+  template<typename _Fn, typename... _ArgTypes>
+    struct is_nothrow_invocable
+    : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
+	     __call_is_nothrow_<_Fn, _ArgTypes...>>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
+	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+    };
+
+  template<typename _Result, typename _Ret, typename = void>
+    struct __is_nt_invocable_impl : false_type { };
+
+  template<typename _Result, typename _Ret>
+    struct __is_nt_invocable_impl<_Result, _Ret,
+				  __void_t<typename _Result::type>>
+    : __or_<is_void<_Ret>,
+	    __is_nothrow_convertible<typename _Result::type, _Ret>>
+    { };
+
+  /// std::is_nothrow_invocable_r
+  template<typename _Ret, typename _Fn, typename... _ArgTypes>
+    struct is_nothrow_invocable_r
+    : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
+             __call_is_nothrow_<_Fn, _ArgTypes...>>::type
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
+	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}),
+	"_Ret must be a complete class or an unbounded array");
+    };
+
+  /// std::is_invocable_v
+  template<typename _Fn, typename... _Args>
+    inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
+
+  /// std::is_nothrow_invocable_v
+  template<typename _Fn, typename... _Args>
+    inline constexpr bool is_nothrow_invocable_v
+      = is_nothrow_invocable<_Fn, _Args...>::value;
+
+  /// std::is_invocable_r_v
+  template<typename _Ret, typename _Fn, typename... _Args>
+    inline constexpr bool is_invocable_r_v
+      = is_invocable_r<_Ret, _Fn, _Args...>::value;
+
+  /// std::is_nothrow_invocable_r_v
+  template<typename _Ret, typename _Fn, typename... _Args>
+    inline constexpr bool is_nothrow_invocable_r_v
+      = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
+
+
+
+#define __cpp_lib_type_trait_variable_templates 201510L
+template <typename _Tp>
+  inline constexpr bool is_void_v = is_void<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_integral_v = is_integral<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_array_v = is_array<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_lvalue_reference_v =
+    is_lvalue_reference<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_rvalue_reference_v =
+    is_rvalue_reference<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_member_object_pointer_v =
+    is_member_object_pointer<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_member_function_pointer_v =
+    is_member_function_pointer<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_enum_v = is_enum<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_union_v = is_union<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_class_v = is_class<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_function_v = is_function<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_reference_v = is_reference<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_object_v = is_object<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_compound_v = is_compound<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_const_v = is_const<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_copyable_v =
+    is_trivially_copyable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+template <typename _Tp>
+  _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead")
+  inline constexpr bool is_pod_v = is_pod<_Tp>::value;
+template <typename _Tp>
+  _GLIBCXX17_DEPRECATED
+  inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
+#pragma GCC diagnostic pop
+ template <typename _Tp>
+  inline constexpr bool is_empty_v = is_empty<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_final_v = is_final<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_signed_v = is_signed<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
+template <typename _Tp, typename... _Args>
+  inline constexpr bool is_constructible_v =
+    is_constructible<_Tp, _Args...>::value;
+template <typename _Tp>
+  inline constexpr bool is_default_constructible_v =
+    is_default_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_copy_constructible_v =
+    is_copy_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_move_constructible_v =
+    is_move_constructible<_Tp>::value;
+template <typename _Tp, typename _Up>
+  inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
+template <typename _Tp>
+  inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
+template <typename _Tp, typename... _Args>
+  inline constexpr bool is_trivially_constructible_v =
+    is_trivially_constructible<_Tp, _Args...>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_default_constructible_v =
+    is_trivially_default_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_copy_constructible_v =
+    is_trivially_copy_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_move_constructible_v =
+    is_trivially_move_constructible<_Tp>::value;
+template <typename _Tp, typename _Up>
+  inline constexpr bool is_trivially_assignable_v =
+    is_trivially_assignable<_Tp, _Up>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_copy_assignable_v =
+    is_trivially_copy_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_move_assignable_v =
+    is_trivially_move_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_trivially_destructible_v =
+    is_trivially_destructible<_Tp>::value;
+template <typename _Tp, typename... _Args>
+  inline constexpr bool is_nothrow_constructible_v =
+    is_nothrow_constructible<_Tp, _Args...>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_default_constructible_v =
+    is_nothrow_default_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_copy_constructible_v =
+    is_nothrow_copy_constructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_move_constructible_v =
+    is_nothrow_move_constructible<_Tp>::value;
+template <typename _Tp, typename _Up>
+  inline constexpr bool is_nothrow_assignable_v =
+    is_nothrow_assignable<_Tp, _Up>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_copy_assignable_v =
+    is_nothrow_copy_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_move_assignable_v =
+    is_nothrow_move_assignable<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool is_nothrow_destructible_v =
+    is_nothrow_destructible<_Tp>::value;
+template <typename _Tp>
+  inline constexpr bool has_virtual_destructor_v =
+    has_virtual_destructor<_Tp>::value;
+template <typename _Tp>
+  inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
+template <typename _Tp>
+  inline constexpr size_t rank_v = rank<_Tp>::value;
+template <typename _Tp, unsigned _Idx = 0>
+  inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
+
+template <typename _Tp, typename _Up>
+  inline constexpr bool is_same_v = __is_same(_Tp, _Up);
+
+
+
+
+template <typename _Base, typename _Derived>
+  inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
+template <typename _From, typename _To>
+  inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
+
+
+#define __cpp_lib_has_unique_object_representations 201606
+  /// has_unique_object_representations
+  template<typename _Tp>
+    struct has_unique_object_representations
+    : bool_constant<__has_unique_object_representations(
+      remove_cv_t<remove_all_extents_t<_Tp>>
+      )>
+    {
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
+	"template argument must be a complete class or an unbounded array");
+    };
+
+  template<typename _Tp>
+    inline constexpr bool has_unique_object_representations_v
+      = has_unique_object_representations<_Tp>::value;
+
+
+
+#define __cpp_lib_is_aggregate 201703
+  /// is_aggregate
+  template<typename _Tp>
+    struct is_aggregate
+    : bool_constant<__is_aggregate(remove_cv_t<_Tp>)>
+    { };
+
+  /// is_aggregate_v
+  template<typename _Tp>
+    inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
+
+
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @addtogroup utilities
+   *  @{
+   */
+
+  /**
+   *  @brief  Forward an lvalue.
+   *  @return The parameter cast to the specified type.
+   *
+   *  This function is used to implement "perfect forwarding".
+   */
+  template<typename _Tp>
+    constexpr _Tp&&
+    forward(typename std::remove_reference<_Tp>::type& __t) noexcept
+    { return static_cast<_Tp&&>(__t); }
+
+  /**
+   *  @brief  Forward an rvalue.
+   *  @return The parameter cast to the specified type.
+   *
+   *  This function is used to implement "perfect forwarding".
+   */
+  template<typename _Tp>
+    constexpr _Tp&&
+    forward(typename std::remove_reference<_Tp>::type&& __t) noexcept
+    {
+      static_assert(!std::is_lvalue_reference<_Tp>::value, "template argument"
+		    " substituting _Tp is an lvalue reference type");
+      return static_cast<_Tp&&>(__t);
+    }
+
+  /**
+   *  @brief  Convert a value to an rvalue.
+   *  @param  __t  A thing of arbitrary type.
+   *  @return The parameter cast to an rvalue-reference to allow moving it.
+  */
+  template<typename _Tp>
+    constexpr typename std::remove_reference<_Tp>::type&&
+    move(_Tp&& __t) noexcept
+    { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
+
+
+  template<typename _Tp>
+    struct __move_if_noexcept_cond
+    : public __and_<__not_<is_nothrow_move_constructible<_Tp>>,
+                    is_copy_constructible<_Tp>>::type { };
+
+  /**
+   *  @brief  Conditionally convert a value to an rvalue.
+   *  @param  __x  A thing of arbitrary type.
+   *  @return The parameter, possibly cast to an rvalue-reference.
+   *
+   *  Same as std::move unless the type's move constructor could throw and the
+   *  type is copyable, in which case an lvalue-reference is returned instead.
+   */
+  template<typename _Tp>
+    constexpr typename
+    conditional<__move_if_noexcept_cond<_Tp>::value, const _Tp&, _Tp&&>::type
+    move_if_noexcept(_Tp& __x) noexcept
+    { return std::move(__x); }
+
+  // declval, from type_traits.
+
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 2296. std::addressof should be constexpr
+#define __cpp_lib_addressof_constexpr 201603
+
+  /**
+   *  @brief Returns the actual address of the object or function
+   *         referenced by r, even in the presence of an overloaded
+   *         operator&.
+   *  @param  __r  Reference to an object or function.
+   *  @return   The actual address.
+  */
+  template<typename _Tp>
+    inline _GLIBCXX17_CONSTEXPR _Tp*
+    addressof(_Tp& __r) noexcept
+    { return std::__addressof(__r); }
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 2598. addressof works on temporaries
+  template<typename _Tp>
+    const _Tp* addressof(const _Tp&&) = delete;
+
+  // C++11 version of std::exchange for internal use.
+  template <typename _Tp, typename _Up = _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _Tp
+    __exchange(_Tp& __obj, _Up&& __new_val)
+    {
+      _Tp __old_val = std::move(__obj);
+      __obj = std::forward<_Up>(__new_val);
+      return __old_val;
+    }
+
+  /// @} group utilities
+
+#define _GLIBCXX_FWDREF(_Tp) _Tp&&
+#define _GLIBCXX_MOVE(__val) std::move(__val)
+#define _GLIBCXX_FORWARD(_Tp,__val) std::forward<_Tp>(__val)
+
+
+
+
+
+
+  /**
+   *  @addtogroup utilities
+   *  @{
+   */
+
+  /**
+   *  @brief Swaps two values.
+   *  @param  __a  A thing of arbitrary type.
+   *  @param  __b  Another thing of arbitrary type.
+   *  @return   Nothing.
+  */
+  template<typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline
+
+    typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
+			      is_move_constructible<_Tp>,
+			      is_move_assignable<_Tp>>::value>::type
+
+
+
+    swap(_Tp& __a, _Tp& __b)
+    _GLIBCXX_NOEXCEPT_IF(__and_<is_nothrow_move_constructible<_Tp>,
+				is_nothrow_move_assignable<_Tp>>::value)
+    {
+
+
+
+
+      _Tp __tmp = _GLIBCXX_MOVE(__a);
+      __a = _GLIBCXX_MOVE(__b);
+      __b = _GLIBCXX_MOVE(__tmp);
+    }
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // DR 809. std::swap should be overloaded for array types.
+  /// Swap the contents of two arrays.
+  template<typename _Tp, size_t _Nm>
+    _GLIBCXX20_CONSTEXPR
+    inline
+
+    typename enable_if<__is_swappable<_Tp>::value>::type
+
+
+
+    swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
+    _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Tp>::value)
+    {
+      for (size_t __n = 0; __n < _Nm; ++__n)
+	swap(__a[__n], __b[__n]);
+    }
+
+  /// @} group utilities
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+extern "C++" {
+
+namespace std
+{
+  /**
+   * @addtogroup exceptions
+   * @{
+   */
+
+  /// Exception class with exception_ptr data member.
+  class nested_exception
+  {
+    exception_ptr _M_ptr;
+
+  public:
+    nested_exception() noexcept : _M_ptr(current_exception()) { }
+
+    nested_exception(const nested_exception&) noexcept = default;
+
+    nested_exception& operator=(const nested_exception&) noexcept = default;
+
+    virtual ~nested_exception() noexcept;
+
+    [[noreturn]]
+    void
+    rethrow_nested() const
+    {
+      if (_M_ptr)
+	rethrow_exception(_M_ptr);
+      std::terminate();
+    }
+
+    exception_ptr
+    nested_ptr() const noexcept
+    { return _M_ptr; }
+  };
+
+  /// @cond undocumented
+
+  template<typename _Except>
+    struct _Nested_exception : public _Except, public nested_exception
+    {
+      explicit _Nested_exception(const _Except& __ex)
+      : _Except(__ex)
+      { }
+
+      explicit _Nested_exception(_Except&& __ex)
+      : _Except(static_cast<_Except&&>(__ex))
+      { }
+    };
+
+  // [except.nested]/8
+  // Throw an exception of unspecified type that is publicly derived from
+  // both remove_reference_t<_Tp> and nested_exception.
+  template<typename _Tp>
+    [[noreturn]]
+    inline void
+    __throw_with_nested_impl(_Tp&& __t, true_type)
+    {
+      using _Up = typename remove_reference<_Tp>::type;
+      throw _Nested_exception<_Up>{std::forward<_Tp>(__t)};
+    }
+
+  template<typename _Tp>
+    [[noreturn]]
+    inline void
+    __throw_with_nested_impl(_Tp&& __t, false_type)
+    { throw std::forward<_Tp>(__t); }
+
+  /// @endcond
+
+  /// If @p __t is derived from nested_exception, throws @p __t.
+  /// Else, throws an implementation-defined object derived from both.
+  template<typename _Tp>
+    [[noreturn]]
+    inline void
+    throw_with_nested(_Tp&& __t)
+    {
+      using _Up = typename decay<_Tp>::type;
+      using _CopyConstructible
+	= __and_<is_copy_constructible<_Up>, is_move_constructible<_Up>>;
+      static_assert(_CopyConstructible::value,
+	  "throw_with_nested argument must be CopyConstructible");
+      using __nest = __and_<is_class<_Up>, __bool_constant<!__is_final(_Up)>,
+			    __not_<is_base_of<nested_exception, _Up>>>;
+      std::__throw_with_nested_impl(std::forward<_Tp>(__t), __nest{});
+    }
+
+  /// @cond undocumented
+
+  // Determine if dynamic_cast<const nested_exception&> would be well-formed.
+  template<typename _Tp>
+    using __rethrow_if_nested_cond = typename enable_if<
+      __and_<is_polymorphic<_Tp>,
+	     __or_<__not_<is_base_of<nested_exception, _Tp>>,
+		   is_convertible<_Tp*, nested_exception*>>>::value
+    >::type;
+
+  // Attempt dynamic_cast to nested_exception and call rethrow_nested().
+  template<typename _Ex>
+    inline __rethrow_if_nested_cond<_Ex>
+    __rethrow_if_nested_impl(const _Ex* __ptr)
+    {
+      if (auto __ne_ptr = dynamic_cast<const nested_exception*>(__ptr))
+	__ne_ptr->rethrow_nested();
+    }
+
+  // Otherwise, no effects.
+  inline void
+  __rethrow_if_nested_impl(const void*)
+  { }
+
+  /// @endcond
+
+  /// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
+  template<typename _Ex>
+    inline void
+    rethrow_if_nested(const _Ex& __ex)
+    { std::__rethrow_if_nested_impl(std::__addressof(__ex)); }
+
+  // @} group exceptions
+} // namespace std
+
+} // extern "C++"
+
+
+
+#pragma GCC visibility pop
+
+
+
+// Character Traits for use by standard string and iostream -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/char_traits.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{string}
+ */
+
+//
+// ISO C++ 14882: 21  Strings library
+//
+
+
+#define _CHAR_TRAITS_H 1
+
+       
+
+// Core algorithmic facilities -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_algobase.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{algorithm}
+ */
+
+
+#define _STL_ALGOBASE_H 1
+
+
+// Function-Based Exception Support -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/functexcept.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{exception}
+ *
+ *  This header provides support for -fno-exceptions.
+ */
+
+//
+// ISO C++ 14882: 19.1  Exception classes
+//
+
+
+#define _FUNCTEXCEPT_H 1
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Helper for exception objects in <except>
+  void
+  __throw_bad_exception(void) __attribute__((__noreturn__));
+
+  // Helper for exception objects in <new>
+  void
+  __throw_bad_alloc(void) __attribute__((__noreturn__));
+
+  void
+  __throw_bad_array_new_length(void) __attribute__((__noreturn__));
+
+  // Helper for exception objects in <typeinfo>
+  void
+  __throw_bad_cast(void) __attribute__((__noreturn__));
+
+  void
+  __throw_bad_typeid(void) __attribute__((__noreturn__));
+
+  // Helpers for exception objects in <stdexcept>
+  void
+  __throw_logic_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_domain_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_invalid_argument(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_length_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_out_of_range(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_out_of_range_fmt(const char*, ...) __attribute__((__noreturn__))
+    __attribute__((__format__(__gnu_printf__, 1, 2)));
+
+  void
+  __throw_runtime_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_range_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_overflow_error(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_underflow_error(const char*) __attribute__((__noreturn__));
+
+  // Helpers for exception objects in <ios>
+  void
+  __throw_ios_failure(const char*) __attribute__((__noreturn__));
+
+  void
+  __throw_ios_failure(const char*, int) __attribute__((__noreturn__));
+
+  // Helpers for exception objects in <system_error>
+  void
+  __throw_system_error(int) __attribute__((__noreturn__));
+
+  // Helpers for exception objects in <future>
+  void
+  __throw_future_error(int) __attribute__((__noreturn__));
+
+  // Helpers for exception objects in <functional>
+  void
+  __throw_bad_function_call() __attribute__((__noreturn__));
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// The  -*- C++ -*- type traits classes for internal use in libstdc++
+
+// Copyright (C) 2000-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cpp_type_traits.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{ext/type_traits}
+ */
+
+// Written by Gabriel Dos Reis <dosreis@cmla.ens-cachan.fr>
+
+
+#define _CPP_TYPE_TRAITS_H 1
+
+       
+
+
+
+//
+// This file provides some compile-time information about various types.
+// These representations were designed, on purpose, to be constant-expressions
+// and not types as found in <bits/type_traits.h>.  In particular, they
+// can be used in control structures and the optimizer hopefully will do
+// the obvious thing.
+//
+// Why integral expressions, and not functions nor types?
+// Firstly, these compile-time entities are used as template-arguments
+// so function return values won't work:  We need compile-time entities.
+// We're left with types and constant  integral expressions.
+// Secondly, from the point of view of ease of use, type-based compile-time
+// information is -not- *that* convenient.  One has to write lots of
+// overloaded functions and to hope that the compiler will select the right
+// one. As a net effect, the overall structure isn't very clear at first
+// glance.
+// Thirdly, partial ordering and overload resolution (of function templates)
+// is highly costly in terms of compiler-resource.  It is a Good Thing to
+// keep these resource consumption as least as possible.
+//
+// See valarray_array.h for a case use.
+//
+// -- Gaby (dosreis@cmla.ens-cachan.fr) 2000-03-06.
+//
+// Update 2005: types are also provided and <bits/type_traits.h> has been
+// removed.
+//
+
+extern "C++" {
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  struct __true_type { };
+  struct __false_type { };
+
+  template<bool>
+    struct __truth_type
+    { typedef __false_type __type; };
+
+  template<>
+    struct __truth_type<true>
+    { typedef __true_type __type; };
+
+  // N.B. The conversions to bool are needed due to the issue
+  // explained in c++/19404.
+  template<class _Sp, class _Tp>
+    struct __traitor
+    {
+      enum { __value = bool(_Sp::__value) || bool(_Tp::__value) };
+      typedef typename __truth_type<__value>::__type __type;
+    };
+
+  // Compare for equality of types.
+  template<typename, typename>
+    struct __are_same
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  template<typename _Tp>
+    struct __are_same<_Tp, _Tp>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  // Holds if the template-argument is a void type.
+  template<typename _Tp>
+    struct __is_void
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  template<>
+    struct __is_void<void>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  //
+  // Integer types
+  //
+  template<typename _Tp>
+    struct __is_integer
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  // Thirteen specializations (yes there are eleven standard integer
+  // types; <em>long long</em> and <em>unsigned long long</em> are
+  // supported as extensions).  Up to four target-specific __int<N>
+  // types are supported as well.
+  template<>
+    struct __is_integer<bool>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<signed char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<unsigned char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+  template<>
+    struct __is_integer<wchar_t>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+
+
+  template<>
+    struct __is_integer<char16_t>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<char32_t>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+  template<>
+    struct __is_integer<short>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<unsigned short>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<int>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<unsigned int>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<long>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<unsigned long>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<long long>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_integer<unsigned long long>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+#define __INT_N(TYPE) template<> struct __is_integer<TYPE> { enum { __value = 1 }; typedef __true_type __type; }; template<> struct __is_integer<unsigned TYPE> { enum { __value = 1 }; typedef __true_type __type; };
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#undef __INT_N
+
+  //
+  // Floating point types
+  //
+  template<typename _Tp>
+    struct __is_floating
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  // three specializations (float, double and 'long double')
+  template<>
+    struct __is_floating<float>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_floating<double>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_floating<long double>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  //
+  // Pointer types
+  //
+  template<typename _Tp>
+    struct __is_pointer
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  template<typename _Tp>
+    struct __is_pointer<_Tp*>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  //
+  // An arithmetic type is an integer type or a floating point type
+  //
+  template<typename _Tp>
+    struct __is_arithmetic
+    : public __traitor<__is_integer<_Tp>, __is_floating<_Tp> >
+    { };
+
+  //
+  // A scalar type is an arithmetic type or a pointer type
+  // 
+  template<typename _Tp>
+    struct __is_scalar
+    : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
+    { };
+
+  //
+  // For use in std::copy and std::find overloads for streambuf iterators.
+  //
+  template<typename _Tp>
+    struct __is_char
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  template<>
+    struct __is_char<char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+  template<>
+    struct __is_char<wchar_t>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+  template<typename _Tp>
+    struct __is_byte
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  template<>
+    struct __is_byte<char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_byte<signed char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<>
+    struct __is_byte<unsigned char>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+  enum class byte : unsigned char;
+
+  template<>
+    struct __is_byte<byte>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+
+
+  template<typename> struct iterator_traits;
+
+  // A type that is safe for use with memcpy, memmove, memcmp etc.
+  template<typename _Tp>
+    struct __is_nonvolatile_trivially_copyable
+    {
+      enum { __value = __is_trivially_copyable(_Tp) };
+    };
+
+  // Cannot use memcpy/memmove/memcmp on volatile types even if they are
+  // trivially copyable, so ensure __memcpyable<volatile int*, volatile int*>
+  // and similar will be false.
+  template<typename _Tp>
+    struct __is_nonvolatile_trivially_copyable<volatile _Tp>
+    {
+      enum { __value = 0 };
+    };
+
+  // Whether two iterator types can be used with memcpy/memmove.
+  template<typename _OutputIter, typename _InputIter>
+    struct __memcpyable
+    {
+      enum { __value = 0 };
+    };
+
+  template<typename _Tp>
+    struct __memcpyable<_Tp*, _Tp*>
+    : __is_nonvolatile_trivially_copyable<_Tp>
+    { };
+
+  template<typename _Tp>
+    struct __memcpyable<_Tp*, const _Tp*>
+    : __is_nonvolatile_trivially_copyable<_Tp>
+    { };
+
+  // Whether two iterator types can be used with memcmp.
+  // This trait only says it's well-formed to use memcmp, not that it
+  // gives the right answer for a given algorithm. So for example, std::equal
+  // needs to add additional checks that the types are integers or pointers,
+  // because other trivially copyable types can overload operator==.
+  template<typename _Iter1, typename _Iter2>
+    struct __memcmpable
+    {
+      enum { __value = 0 };
+    };
+
+  // OK to use memcmp with pointers to trivially copyable types.
+  template<typename _Tp>
+    struct __memcmpable<_Tp*, _Tp*>
+    : __is_nonvolatile_trivially_copyable<_Tp>
+    { };
+
+  template<typename _Tp>
+    struct __memcmpable<const _Tp*, _Tp*>
+    : __is_nonvolatile_trivially_copyable<_Tp>
+    { };
+
+  template<typename _Tp>
+    struct __memcmpable<_Tp*, const _Tp*>
+    : __is_nonvolatile_trivially_copyable<_Tp>
+    { };
+
+  // Whether memcmp can be used to determine ordering for a type
+  // e.g. in std::lexicographical_compare or three-way comparisons.
+  // True for unsigned integer-like types where comparing each byte in turn
+  // as an unsigned char yields the right result. This is true for all
+  // unsigned integers on big endian targets, but only unsigned narrow
+  // character types (and std::byte) on little endian targets.
+  template<typename _Tp, bool _TreatAsBytes =
+
+
+
+	__is_byte<_Tp>::__value
+
+    >
+    struct __is_memcmp_ordered
+    {
+      static const bool __value = _Tp(-1) > _Tp(1); // is unsigned
+    };
+
+  template<typename _Tp>
+    struct __is_memcmp_ordered<_Tp, false>
+    {
+      static const bool __value = false;
+    };
+
+  // Whether two types can be compared using memcmp.
+  template<typename _Tp, typename _Up, bool = sizeof(_Tp) == sizeof(_Up)>
+    struct __is_memcmp_ordered_with
+    {
+      static const bool __value = __is_memcmp_ordered<_Tp>::__value
+	&& __is_memcmp_ordered<_Up>::__value;
+    };
+
+  template<typename _Tp, typename _Up>
+    struct __is_memcmp_ordered_with<_Tp, _Up, false>
+    {
+      static const bool __value = false;
+    };
+
+
+
+
+
+
+
+
+
+  // std::byte can only be compared to itself, not to other types.
+  template<>
+    struct __is_memcmp_ordered_with<std::byte, std::byte, true>
+    { static constexpr bool __value = true; };
+
+  template<typename _Tp, bool _SameSize>
+    struct __is_memcmp_ordered_with<_Tp, std::byte, _SameSize>
+    { static constexpr bool __value = false; };
+
+  template<typename _Up, bool _SameSize>
+    struct __is_memcmp_ordered_with<std::byte, _Up, _SameSize>
+    { static constexpr bool __value = false; };
+
+
+  //
+  // Move iterator type
+  //
+  template<typename _Tp>
+    struct __is_move_iterator
+    {
+      enum { __value = 0 };
+      typedef __false_type __type;
+    };
+
+  // Fallback implementation of the function in bits/stl_iterator.h used to
+  // remove the move_iterator wrapper.
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iterator
+    __miter_base(_Iterator __it)
+    { return __it; }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+} // extern "C++"
+
+// -*- C++ -*-
+
+// Copyright (C) 2005-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file ext/type_traits.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+
+#define _EXT_TYPE_TRAITS 1
+
+       
+
+
+
+
+extern "C++" {
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Define a nested type if some predicate holds.
+  template<bool, typename>
+    struct __enable_if 
+    { };
+
+  template<typename _Tp>
+    struct __enable_if<true, _Tp>
+    { typedef _Tp __type; };
+
+
+  // Conditional expression for types. If true, first, if false, second.
+  template<bool _Cond, typename _Iftrue, typename _Iffalse>
+    struct __conditional_type
+    { typedef _Iftrue __type; };
+
+  template<typename _Iftrue, typename _Iffalse>
+    struct __conditional_type<false, _Iftrue, _Iffalse>
+    { typedef _Iffalse __type; };
+
+
+  // Given an integral builtin type, return the corresponding unsigned type.
+  template<typename _Tp>
+    struct __add_unsigned
+    { 
+    private:
+      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
+      
+    public:
+      typedef typename __if_type::__type __type; 
+    };
+
+  template<>
+    struct __add_unsigned<char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __add_unsigned<signed char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __add_unsigned<short>
+    { typedef unsigned short __type; };
+
+  template<>
+    struct __add_unsigned<int>
+    { typedef unsigned int __type; };
+
+  template<>
+    struct __add_unsigned<long>
+    { typedef unsigned long __type; };
+
+  template<>
+    struct __add_unsigned<long long>
+    { typedef unsigned long long __type; };
+
+  // Declare but don't define.
+  template<>
+    struct __add_unsigned<bool>;
+
+  template<>
+    struct __add_unsigned<wchar_t>;
+
+
+  // Given an integral builtin type, return the corresponding signed type.
+  template<typename _Tp>
+    struct __remove_unsigned
+    { 
+    private:
+      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
+      
+    public:
+      typedef typename __if_type::__type __type; 
+    };
+
+  template<>
+    struct __remove_unsigned<char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned short>
+    { typedef short __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned int>
+    { typedef int __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned long>
+    { typedef long __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned long long>
+    { typedef long long __type; };
+
+  // Declare but don't define.
+  template<>
+    struct __remove_unsigned<bool>;
+
+  template<>
+    struct __remove_unsigned<wchar_t>;
+
+
+  // For use in string and vstring.
+  template<typename _Type>
+    inline bool
+    __is_null_pointer(_Type* __ptr)
+    { return __ptr == 0; }
+
+  template<typename _Type>
+    inline bool
+    __is_null_pointer(_Type)
+    { return false; }
+
+
+  inline bool
+  __is_null_pointer(std::nullptr_t)
+  { return true; }
+
+
+  // For complex and cmath
+  template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
+    struct __promote
+    { typedef double __type; };
+
+  // No nested __type member for non-integer non-floating point types,
+  // allows this type to be used for SFINAE to constrain overloads in
+  // <cmath> and <complex> to only the intended types.
+  template<typename _Tp>
+    struct __promote<_Tp, false>
+    { };
+
+  template<>
+    struct __promote<long double>
+    { typedef long double __type; };
+
+  template<>
+    struct __promote<double>
+    { typedef double __type; };
+
+  template<>
+    struct __promote<float>
+    { typedef float __type; };
+
+  template<typename _Tp, typename _Up,
+           typename _Tp2 = typename __promote<_Tp>::__type,
+           typename _Up2 = typename __promote<_Up>::__type>
+    struct __promote_2
+    {
+      typedef __typeof__(_Tp2() + _Up2()) __type;
+    };
+
+  template<typename _Tp, typename _Up, typename _Vp,
+           typename _Tp2 = typename __promote<_Tp>::__type,
+           typename _Up2 = typename __promote<_Up>::__type,
+           typename _Vp2 = typename __promote<_Vp>::__type>
+    struct __promote_3
+    {
+      typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type;
+    };
+
+  template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
+           typename _Tp2 = typename __promote<_Tp>::__type,
+           typename _Up2 = typename __promote<_Up>::__type,
+           typename _Vp2 = typename __promote<_Vp>::__type,
+           typename _Wp2 = typename __promote<_Wp>::__type>
+    struct __promote_4
+    {
+      typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type;
+    };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+} // extern "C++"
+
+// -*- C++ -*-
+
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file ext/numeric_traits.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+
+#define _EXT_NUMERIC_TRAITS 1
+
+       
+
+
+
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Compile time constants for builtin types.
+  // In C++98 std::numeric_limits member functions are not constant expressions
+  // (that changed in C++11 with the addition of 'constexpr').
+  // Even for C++11, this header is smaller than <limits> and can be used
+  // when only is_signed, digits, min, or max values are needed for integers,
+  // or is_signed, digits10, max_digits10, or max_exponent10 for floats.
+
+  // Unlike __is_integer (and std::is_integral) this trait is true for
+  // non-standard built-in integer types such as __int128 and __int20.
+  template<typename _Tp>
+    struct __is_integer_nonstrict
+    : public std::__is_integer<_Tp>
+    {
+      using std::__is_integer<_Tp>::__value;
+
+      // The number of bits in the value representation.
+      enum { __width = __value ? sizeof(_Tp) * __CHAR_BIT__ : 0 };
+    };
+
+  template<typename _Value>
+    struct __numeric_traits_integer
+    {
+
+      static_assert(__is_integer_nonstrict<_Value>::__value,
+		    "invalid specialization");
+
+
+      // NB: these two are also available in std::numeric_limits as compile
+      // time constants, but <limits> is big and we can avoid including it.
+      static const bool __is_signed = (_Value)(-1) < 0;
+      static const int __digits
+	= __is_integer_nonstrict<_Value>::__width - __is_signed;
+
+      // The initializers must be constants so that __max and __min are too.
+      static const _Value __max = __is_signed
+	? (((((_Value)1 << (__digits - 1)) - 1) << 1) + 1)
+	: ~(_Value)0;
+      static const _Value __min = __is_signed ? -__max - 1 : (_Value)0;
+    };
+
+  template<typename _Value>
+    const _Value __numeric_traits_integer<_Value>::__min;
+
+  template<typename _Value>
+    const _Value __numeric_traits_integer<_Value>::__max;
+
+  template<typename _Value>
+    const bool __numeric_traits_integer<_Value>::__is_signed;
+
+  template<typename _Value>
+    const int __numeric_traits_integer<_Value>::__digits;
+
+  // Enable __numeric_traits_integer for types where the __is_integer_nonstrict
+  // primary template doesn't give the right answer.
+#define _GLIBCXX_INT_N_TRAITS(T,WIDTH) template<> struct __is_integer_nonstrict<T> { enum { __value = 1 }; typedef std::__true_type __type; enum { __width = WIDTH }; }; template<> struct __is_integer_nonstrict<unsigned T> { enum { __value = 1 }; typedef std::__true_type __type; enum { __width = WIDTH }; };
+
+  // We need to specify the width for some __intNN types because they
+  // have padding bits, e.g. the object representation of __int20 has 32 bits,
+  // but its width (number of bits in the value representation) is only 20.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+  // In strict modes __is_integer<__int128> is false,
+  // but we still want to define __numeric_traits_integer<__int128>.
+  _GLIBCXX_INT_N_TRAITS(__int128, 128)
+
+
+#undef _GLIBCXX_INT_N_TRAITS
+
+
+  /// Convenience alias for __numeric_traits<integer-type>.
+  template<typename _Tp>
+    using __int_traits = __numeric_traits_integer<_Tp>;
+
+
+#define __glibcxx_floating(_Tp,_Fval,_Dval,_LDval) (std::__are_same<_Tp, float>::__value ? _Fval : std::__are_same<_Tp, double>::__value ? _Dval : _LDval)
+
+
+
+#define __glibcxx_max_digits10(_Tp) (2 + __glibcxx_floating(_Tp, __FLT_MANT_DIG__, __DBL_MANT_DIG__, __LDBL_MANT_DIG__) * 643L / 2136)
+
+
+
+#define __glibcxx_digits10(_Tp) __glibcxx_floating(_Tp, __FLT_DIG__, __DBL_DIG__, __LDBL_DIG__)
+
+
+#define __glibcxx_max_exponent10(_Tp) __glibcxx_floating(_Tp, __FLT_MAX_10_EXP__, __DBL_MAX_10_EXP__, __LDBL_MAX_10_EXP__)
+
+
+
+  // N.B. this only supports float, double and long double (no __float128 etc.)
+  template<typename _Value>
+    struct __numeric_traits_floating
+    {
+      // Only floating point types. See N1822.
+      static const int __max_digits10 = __glibcxx_max_digits10(_Value);
+
+      // See above comment...
+      static const bool __is_signed = true;
+      static const int __digits10 = __glibcxx_digits10(_Value);
+      static const int __max_exponent10 = __glibcxx_max_exponent10(_Value);
+    };
+
+  template<typename _Value>
+    const int __numeric_traits_floating<_Value>::__max_digits10;
+
+  template<typename _Value>
+    const bool __numeric_traits_floating<_Value>::__is_signed;
+
+  template<typename _Value>
+    const int __numeric_traits_floating<_Value>::__digits10;
+
+  template<typename _Value>
+    const int __numeric_traits_floating<_Value>::__max_exponent10;
+
+#undef __glibcxx_floating
+#undef __glibcxx_max_digits10
+#undef __glibcxx_digits10
+#undef __glibcxx_max_exponent10
+
+  template<typename _Value>
+    struct __numeric_traits
+    : public __numeric_traits_integer<_Value>
+    { };
+
+  template<>
+    struct __numeric_traits<float>
+    : public __numeric_traits_floating<float>
+    { };
+
+  template<>
+    struct __numeric_traits<double>
+    : public __numeric_traits_floating<double>
+    { };
+
+  template<>
+    struct __numeric_traits<long double>
+    : public __numeric_traits_floating<long double>
+    { };
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// Pair implementation -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996,1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_pair.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{utility}
+ */
+
+
+#define _STL_PAIR_H 1
+
+
+
+
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @addtogroup utilities
+   *  @{
+   */
+
+
+  /// Tag type for piecewise construction of std::pair objects.
+  struct piecewise_construct_t { explicit piecewise_construct_t() = default; };
+
+  /// Tag for piecewise construction of std::pair objects.
+  _GLIBCXX17_INLINE constexpr piecewise_construct_t piecewise_construct =
+    piecewise_construct_t();
+
+  /// @cond undocumented
+
+  // Forward declarations.
+  template<typename...>
+    class tuple;
+
+  template<size_t...>
+    struct _Index_tuple;
+
+  // Concept utility functions, reused in conditionally-explicit
+  // constructors.
+  // See PR 70437, don't look at is_constructible or
+  // is_convertible if the types are the same to
+  // avoid querying those properties for incomplete types.
+  template <bool, typename _T1, typename _T2>
+    struct _PCC
+    {
+      template <typename _U1, typename _U2>
+      static constexpr bool _ConstructiblePair()
+      {
+	return __and_<is_constructible<_T1, const _U1&>,
+		      is_constructible<_T2, const _U2&>>::value;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _ImplicitlyConvertiblePair()
+      {
+	return __and_<is_convertible<const _U1&, _T1>,
+		      is_convertible<const _U2&, _T2>>::value;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _MoveConstructiblePair()
+      {
+	return __and_<is_constructible<_T1, _U1&&>,
+		      is_constructible<_T2, _U2&&>>::value;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _ImplicitlyMoveConvertiblePair()
+      {
+	return __and_<is_convertible<_U1&&, _T1>,
+		      is_convertible<_U2&&, _T2>>::value;
+      }
+
+      template <bool __implicit, typename _U1, typename _U2>
+      static constexpr bool _CopyMovePair()
+      {
+	using __do_converts = __and_<is_convertible<const _U1&, _T1>,
+				  is_convertible<_U2&&, _T2>>;
+	using __converts = typename conditional<__implicit,
+				       __do_converts,
+				       __not_<__do_converts>>::type;
+	return __and_<is_constructible<_T1, const _U1&>,
+		      is_constructible<_T2, _U2&&>,
+		      __converts
+		      >::value;
+      }
+
+      template <bool __implicit, typename _U1, typename _U2>
+      static constexpr bool _MoveCopyPair()
+      {
+	using __do_converts = __and_<is_convertible<_U1&&, _T1>,
+				  is_convertible<const _U2&, _T2>>;
+	using __converts = typename conditional<__implicit,
+				       __do_converts,
+				       __not_<__do_converts>>::type;
+	return __and_<is_constructible<_T1, _U1&&>,
+		      is_constructible<_T2, const _U2&&>,
+		      __converts
+		      >::value;
+      }
+  };
+
+  template <typename _T1, typename _T2>
+    struct _PCC<false, _T1, _T2>
+    {
+      template <typename _U1, typename _U2>
+      static constexpr bool _ConstructiblePair()
+      {
+	return false;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _ImplicitlyConvertiblePair()
+      {
+	return false;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _MoveConstructiblePair()
+      {
+	return false;
+      }
+
+      template <typename _U1, typename _U2>
+      static constexpr bool _ImplicitlyMoveConvertiblePair()
+      {
+	return false;
+      }
+  };
+
+
+  template<typename _U1, typename _U2> class __pair_base
+  {
+
+    template<typename _T1, typename _T2> friend struct pair;
+    __pair_base() = default;
+    ~__pair_base() = default;
+    __pair_base(const __pair_base&) = default;
+    __pair_base& operator=(const __pair_base&) = delete;
+
+  };
+
+  /// @endcond
+
+ /**
+   *  @brief Struct holding two objects of arbitrary type.
+   *
+   *  @tparam _T1  Type of first object.
+   *  @tparam _T2  Type of second object.
+   *
+   *  <https://gcc.gnu.org/onlinedocs/libstdc++/manual/utilities.html>
+   */
+  template<typename _T1, typename _T2>
+    struct pair
+    : private __pair_base<_T1, _T2>
+    {
+      typedef _T1 first_type;    ///< The type of the `first` member
+      typedef _T2 second_type;   ///< The type of the `second` member
+
+      _T1 first;                 ///< The first member
+      _T2 second;                ///< The second member
+
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 265.  std::pair::pair() effects overly restrictive
+      /** The default constructor creates @c first and @c second using their
+       *  respective default constructors.  */
+
+      template <typename _U1 = _T1,
+                typename _U2 = _T2,
+                typename enable_if<__and_<
+                                     __is_implicitly_default_constructible<_U1>,
+                                     __is_implicitly_default_constructible<_U2>>
+                                   ::value, bool>::type = true>
+
+      _GLIBCXX_CONSTEXPR pair()
+      : first(), second() { }
+
+
+      template <typename _U1 = _T1,
+                typename _U2 = _T2,
+                typename enable_if<__and_<
+                       is_default_constructible<_U1>,
+                       is_default_constructible<_U2>,
+                       __not_<
+                         __and_<__is_implicitly_default_constructible<_U1>,
+                                __is_implicitly_default_constructible<_U2>>>>
+                                   ::value, bool>::type = false>
+      explicit constexpr pair()
+      : first(), second() { }
+
+
+
+
+
+
+
+      // Shortcut for constraining the templates that don't take pairs.
+      /// @cond undocumented
+      using _PCCP = _PCC<true, _T1, _T2>;
+      /// @endcond
+
+      /// Construct from two const lvalues, allowing implicit conversions.
+      template<typename _U1 = _T1, typename _U2=_T2, typename
+	       enable_if<_PCCP::template
+			   _ConstructiblePair<_U1, _U2>()
+	                 && _PCCP::template
+			   _ImplicitlyConvertiblePair<_U1, _U2>(),
+                         bool>::type=true>
+      constexpr pair(const _T1& __a, const _T2& __b)
+      : first(__a), second(__b) { }
+
+      /// Construct from two const lvalues, disallowing implicit conversions.
+       template<typename _U1 = _T1, typename _U2=_T2, typename
+		enable_if<_PCCP::template
+			    _ConstructiblePair<_U1, _U2>()
+	                  && !_PCCP::template
+			    _ImplicitlyConvertiblePair<_U1, _U2>(),
+                         bool>::type=false>
+      explicit constexpr pair(const _T1& __a, const _T2& __b)
+      : first(__a), second(__b) { }
+
+
+
+
+
+
+
+
+      // Shortcut for constraining the templates that take pairs.
+      /// @cond undocumented
+      template <typename _U1, typename _U2>
+        using _PCCFP = _PCC<!is_same<_T1, _U1>::value
+			    || !is_same<_T2, _U2>::value,
+			    _T1, _T2>;
+      /// @endcond
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCFP<_U1, _U2>::template
+			   _ConstructiblePair<_U1, _U2>()
+	                 && _PCCFP<_U1, _U2>::template
+			   _ImplicitlyConvertiblePair<_U1, _U2>(),
+			  bool>::type=true>
+        constexpr pair(const pair<_U1, _U2>& __p)
+        : first(__p.first), second(__p.second) { }
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCFP<_U1, _U2>::template
+			   _ConstructiblePair<_U1, _U2>()
+			 && !_PCCFP<_U1, _U2>::template
+			   _ImplicitlyConvertiblePair<_U1, _U2>(),
+                         bool>::type=false>
+	explicit constexpr pair(const pair<_U1, _U2>& __p)
+	: first(__p.first), second(__p.second) { }
+
+
+
+      constexpr pair(const pair&) = default;	///< Copy constructor
+      constexpr pair(pair&&) = default;		///< Move constructor
+
+      // DR 811.
+      template<typename _U1, typename
+	       enable_if<_PCCP::template
+			   _MoveCopyPair<true, _U1, _T2>(),
+                         bool>::type=true>
+       constexpr pair(_U1&& __x, const _T2& __y)
+       : first(std::forward<_U1>(__x)), second(__y) { }
+
+      template<typename _U1, typename
+	       enable_if<_PCCP::template
+			   _MoveCopyPair<false, _U1, _T2>(),
+                         bool>::type=false>
+       explicit constexpr pair(_U1&& __x, const _T2& __y)
+       : first(std::forward<_U1>(__x)), second(__y) { }
+
+      template<typename _U2, typename
+	       enable_if<_PCCP::template
+			   _CopyMovePair<true, _T1, _U2>(),
+                         bool>::type=true>
+       constexpr pair(const _T1& __x, _U2&& __y)
+       : first(__x), second(std::forward<_U2>(__y)) { }
+
+      template<typename _U2, typename
+	       enable_if<_PCCP::template
+			   _CopyMovePair<false, _T1, _U2>(),
+                         bool>::type=false>
+       explicit pair(const _T1& __x, _U2&& __y)
+       : first(__x), second(std::forward<_U2>(__y)) { }
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCP::template
+			   _MoveConstructiblePair<_U1, _U2>()
+			  && _PCCP::template
+			   _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
+                         bool>::type=true>
+	constexpr pair(_U1&& __x, _U2&& __y)
+	: first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCP::template
+			   _MoveConstructiblePair<_U1, _U2>()
+			  && !_PCCP::template
+			   _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
+                         bool>::type=false>
+	explicit constexpr pair(_U1&& __x, _U2&& __y)
+	: first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
+
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCFP<_U1, _U2>::template
+			   _MoveConstructiblePair<_U1, _U2>()
+			  && _PCCFP<_U1, _U2>::template
+			   _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
+                         bool>::type=true>
+	constexpr pair(pair<_U1, _U2>&& __p)
+	: first(std::forward<_U1>(__p.first)),
+	  second(std::forward<_U2>(__p.second)) { }
+
+      template<typename _U1, typename _U2, typename
+	       enable_if<_PCCFP<_U1, _U2>::template
+			   _MoveConstructiblePair<_U1, _U2>()
+			  && !_PCCFP<_U1, _U2>::template
+			   _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
+                         bool>::type=false>
+	explicit constexpr pair(pair<_U1, _U2>&& __p)
+	: first(std::forward<_U1>(__p.first)),
+	  second(std::forward<_U2>(__p.second)) { }
+
+      template<typename... _Args1, typename... _Args2>
+	_GLIBCXX20_CONSTEXPR
+        pair(piecewise_construct_t, tuple<_Args1...>, tuple<_Args2...>);
+
+      _GLIBCXX20_CONSTEXPR pair&
+      operator=(typename conditional<
+		__and_<is_copy_assignable<_T1>,
+		       is_copy_assignable<_T2>>::value,
+		const pair&, const __nonesuch&>::type __p)
+      {
+	first = __p.first;
+	second = __p.second;
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR pair&
+      operator=(typename conditional<
+		__and_<is_move_assignable<_T1>,
+		       is_move_assignable<_T2>>::value,
+		pair&&, __nonesuch&&>::type __p)
+      noexcept(__and_<is_nothrow_move_assignable<_T1>,
+		      is_nothrow_move_assignable<_T2>>::value)
+      {
+	first = std::forward<first_type>(__p.first);
+	second = std::forward<second_type>(__p.second);
+	return *this;
+      }
+
+      template<typename _U1, typename _U2>
+	_GLIBCXX20_CONSTEXPR
+	typename enable_if<__and_<is_assignable<_T1&, const _U1&>,
+				  is_assignable<_T2&, const _U2&>>::value,
+			   pair&>::type
+	operator=(const pair<_U1, _U2>& __p)
+	{
+	  first = __p.first;
+	  second = __p.second;
+	  return *this;
+	}
+
+      template<typename _U1, typename _U2>
+	_GLIBCXX20_CONSTEXPR
+	typename enable_if<__and_<is_assignable<_T1&, _U1&&>,
+				  is_assignable<_T2&, _U2&&>>::value,
+			   pair&>::type
+	operator=(pair<_U1, _U2>&& __p)
+	{
+	  first = std::forward<_U1>(__p.first);
+	  second = std::forward<_U2>(__p.second);
+	  return *this;
+	}
+
+      /// Swap the first members and then the second members.
+      _GLIBCXX20_CONSTEXPR void
+      swap(pair& __p)
+      noexcept(__and_<__is_nothrow_swappable<_T1>,
+                      __is_nothrow_swappable<_T2>>::value)
+      {
+	using std::swap;
+	swap(first, __p.first);
+	swap(second, __p.second);
+      }
+
+    private:
+      template<typename... _Args1, size_t... _Indexes1,
+	       typename... _Args2, size_t... _Indexes2>
+	_GLIBCXX20_CONSTEXPR
+        pair(tuple<_Args1...>&, tuple<_Args2...>&,
+	     _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
+
+    };
+
+  /// @relates pair @{
+
+
+  template<typename _T1, typename _T2> pair(_T1, _T2) -> pair<_T1, _T2>;
+
+
+  /// Two pairs of the same type are equal iff their members are equal.
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return __x.first == __y.first && __x.second == __y.second; }
+
+  /** Defines a lexicographical order for pairs.
+   *
+   * For two pairs of the same type, `P` is ordered before `Q` if
+   * `P.first` is less than `Q.first`, or if `P.first` and `Q.first`
+   * are equivalent (neither is less than the other) and `P.second` is less
+   * than `Q.second`.
+  */
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return __x.first < __y.first
+	     || (!(__y.first < __x.first) && __x.second < __y.second); }
+
+  /// Uses @c operator== to find the result.
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return !(__x == __y); }
+
+  /// Uses @c operator< to find the result.
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return __y < __x; }
+
+  /// Uses @c operator< to find the result.
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return !(__y < __x); }
+
+  /// Uses @c operator< to find the result.
+  template<typename _T1, typename _T2>
+    inline _GLIBCXX_CONSTEXPR bool
+    operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
+    { return !(__x < __y); }
+
+
+
+  /** Swap overload for pairs. Calls std::pair::swap().
+   *
+   * @note This std::swap overload is not declared in C++03 mode,
+   * which has performance implications, e.g. see https://gcc.gnu.org/PR38466
+  */
+  template<typename _T1, typename _T2>
+    _GLIBCXX20_CONSTEXPR inline
+
+    // Constrained free swap overload, see p0185r1
+    typename enable_if<__and_<__is_swappable<_T1>,
+                              __is_swappable<_T2>>::value>::type
+
+
+
+    swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
+    noexcept(noexcept(__x.swap(__y)))
+    { __x.swap(__y); }
+
+
+  template<typename _T1, typename _T2>
+    typename enable_if<!__and_<__is_swappable<_T1>,
+			       __is_swappable<_T2>>::value>::type
+    swap(pair<_T1, _T2>&, pair<_T1, _T2>&) = delete;
+
+
+
+  // @} relates pair
+
+  /**
+   *  @brief A convenience wrapper for creating a pair from two objects.
+   *  @param  __x  The first object.
+   *  @param  __y  The second object.
+   *  @return   A newly-constructed pair<> object of the appropriate type.
+   *
+   *  The C++98 standard says the objects are passed by reference-to-const,
+   *  but C++03 says they are passed by value (this was LWG issue #181).
+   *
+   *  Since C++11 they have been passed by forwarding reference and then
+   *  forwarded to the new members of the pair. To create a pair with a
+   *  member of reference type, pass a `reference_wrapper` to this function.
+   */
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 181.  make_pair() unintended behavior
+
+  // NB: DR 706.
+  template<typename _T1, typename _T2>
+    constexpr pair<typename __decay_and_strip<_T1>::__type,
+                   typename __decay_and_strip<_T2>::__type>
+    make_pair(_T1&& __x, _T2&& __y)
+    {
+      typedef typename __decay_and_strip<_T1>::__type __ds_type1;
+      typedef typename __decay_and_strip<_T2>::__type __ds_type2;
+      typedef pair<__ds_type1, __ds_type2> 	      __pair_type;
+      return __pair_type(std::forward<_T1>(__x), std::forward<_T2>(__y));
+    }
+
+
+
+
+
+
+
+  /// @}
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+// Types used in iterator implementation -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_iterator_base_types.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iterator}
+ *
+ *  This file contains all of the general iterator-related utility types,
+ *  such as iterator_traits and struct iterator.
+ */
+
+
+#define _STL_ITERATOR_BASE_TYPES_H 1
+
+       
+
+
+
+
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @defgroup iterators Iterators
+   *  Abstractions for uniform iterating through various underlying types.
+  */
+  //@{ 
+
+  /**
+   *  @defgroup iterator_tags Iterator Tags
+   *  These are empty types, used to distinguish different iterators.  The
+   *  distinction is not made by what they contain, but simply by what they
+   *  are.  Different underlying algorithms can then be used based on the
+   *  different operations supported by different iterator types.
+  */
+  //@{ 
+  ///  Marking input iterators.
+  struct input_iterator_tag { };
+
+  ///  Marking output iterators.
+  struct output_iterator_tag { };
+
+  /// Forward iterators support a superset of input iterator operations.
+  struct forward_iterator_tag : public input_iterator_tag { };
+
+  /// Bidirectional iterators support a superset of forward iterator
+  /// operations.
+  struct bidirectional_iterator_tag : public forward_iterator_tag { };
+
+  /// Random-access iterators support a superset of bidirectional
+  /// iterator operations.
+  struct random_access_iterator_tag : public bidirectional_iterator_tag { };
+
+
+
+
+
+  //@}
+
+  /**
+   *  @brief  Common %iterator class.
+   *
+   *  This class does nothing but define nested typedefs.  %Iterator classes
+   *  can inherit from this class to save some work.  The typedefs are then
+   *  used in specializations and overloading.
+   *
+   *  In particular, there are no default implementations of requirements
+   *  such as @c operator++ and the like.  (How could there be?)
+  */
+  template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
+           typename _Pointer = _Tp*, typename _Reference = _Tp&>
+    struct iterator
+    {
+      /// One of the @link iterator_tags tag types@endlink.
+      typedef _Category  iterator_category;
+      /// The type "pointed to" by the iterator.
+      typedef _Tp        value_type;
+      /// Distance between iterators is represented as this type.
+      typedef _Distance  difference_type;
+      /// This type represents a pointer-to-value_type.
+      typedef _Pointer   pointer;
+      /// This type represents a reference-to-value_type.
+      typedef _Reference reference;
+    };
+
+  /**
+   *  @brief  Traits class for iterators.
+   *
+   *  This class does nothing but define nested typedefs.  The general
+   *  version simply @a forwards the nested typedefs from the Iterator
+   *  argument.  Specialized versions for pointers and pointers-to-const
+   *  provide tighter, more correct semantics.
+  */
+  template<typename _Iterator>
+    struct iterator_traits;
+
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 2408. SFINAE-friendly common_type/iterator_traits is missing in C++14
+  template<typename _Iterator, typename = __void_t<>>
+    struct __iterator_traits { };
+
+
+
+  template<typename _Iterator>
+    struct __iterator_traits<_Iterator,
+			     __void_t<typename _Iterator::iterator_category,
+				      typename _Iterator::value_type,
+				      typename _Iterator::difference_type,
+				      typename _Iterator::pointer,
+				      typename _Iterator::reference>>
+    {
+      typedef typename _Iterator::iterator_category iterator_category;
+      typedef typename _Iterator::value_type        value_type;
+      typedef typename _Iterator::difference_type   difference_type;
+      typedef typename _Iterator::pointer           pointer;
+      typedef typename _Iterator::reference         reference;
+    };
+
+
+  template<typename _Iterator>
+    struct iterator_traits
+    : public __iterator_traits<_Iterator> { };
+
+
+  /// Partial specialization for pointer types.
+  template<typename _Tp>
+    struct iterator_traits<_Tp*>
+    {
+      typedef random_access_iterator_tag iterator_category;
+      typedef _Tp                         value_type;
+      typedef ptrdiff_t                   difference_type;
+      typedef _Tp*                        pointer;
+      typedef _Tp&                        reference;
+    };
+
+  /// Partial specialization for const pointer types.
+  template<typename _Tp>
+    struct iterator_traits<const _Tp*>
+    {
+      typedef random_access_iterator_tag iterator_category;
+      typedef _Tp                         value_type;
+      typedef ptrdiff_t                   difference_type;
+      typedef const _Tp*                  pointer;
+      typedef const _Tp&                  reference;
+    };
+
+
+  /**
+   *  This function is not a part of the C++ standard but is syntactic
+   *  sugar for internal library use only.
+  */
+  template<typename _Iter>
+    inline _GLIBCXX_CONSTEXPR
+    typename iterator_traits<_Iter>::iterator_category
+    __iterator_category(const _Iter&)
+    { return typename iterator_traits<_Iter>::iterator_category(); }
+
+  //@}
+
+
+  template<typename _Iter>
+    using __iterator_category_t
+      = typename iterator_traits<_Iter>::iterator_category;
+
+  template<typename _InIter>
+    using _RequireInputIter =
+      __enable_if_t<is_convertible<__iterator_category_t<_InIter>,
+				   input_iterator_tag>::value>;
+
+  template<typename _It,
+	   typename _Cat = __iterator_category_t<_It>>
+    struct __is_random_access_iter
+      : is_base_of<random_access_iterator_tag, _Cat>
+    {
+      typedef is_base_of<random_access_iterator_tag, _Cat> _Base;
+      enum { __value = _Base::value };
+    };
+
+
+
+
+
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// Functions used by iterators -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_iterator_base_funcs.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iterator}
+ *
+ *  This file contains all of the general iterator-related utility
+ *  functions, such as distance() and advance().
+ */
+
+
+#define _STL_ITERATOR_BASE_FUNCS_H 1
+
+       
+
+// Concept-checking control -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/concept_check.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iterator}
+ */
+
+
+#define _CONCEPT_CHECK_H 1
+
+       
+
+
+
+// All places in libstdc++-v3 where these are used, or /might/ be used, or
+// don't need to be used, or perhaps /should/ be used, are commented with
+// "concept requirements" (and maybe some more text).  So grep like crazy
+// if you're looking for additional places to use these.
+
+// Concept-checking code is off by default unless users turn it on via
+// configure options or editing c++config.h.
+// It is not supported for freestanding implementations.
+
+
+
+#define __glibcxx_function_requires(...) 
+#define __glibcxx_class_requires(_a,_b) 
+#define __glibcxx_class_requires2(_a,_b,_c) 
+#define __glibcxx_class_requires3(_a,_b,_c,_d) 
+#define __glibcxx_class_requires4(_a,_b,_c,_d,_e) 
+
+
+// Debugging support implementation -*- C++ -*-
+
+// Copyright (C) 2003-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file debug/assertions.h
+ *  This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+
+#define _GLIBCXX_DEBUG_ASSERTIONS_H 1
+
+
+
+#define _GLIBCXX_DEBUG_ASSERT(_Condition) 
+#define _GLIBCXX_DEBUG_PEDASSERT(_Condition) 
+#define _GLIBCXX_DEBUG_ONLY(_Statement) 
+
+
+
+
+#define __glibcxx_requires_non_empty_range(_First,_Last) 
+#define __glibcxx_requires_nonempty() 
+#define __glibcxx_requires_subscript(_N) 
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+  // Forward declaration for the overloads of __distance.
+  template <typename> struct _List_iterator;
+  template <typename> struct _List_const_iterator;
+_GLIBCXX_END_NAMESPACE_CONTAINER
+
+  template<typename _InputIterator>
+    inline _GLIBCXX14_CONSTEXPR
+    typename iterator_traits<_InputIterator>::difference_type
+    __distance(_InputIterator __first, _InputIterator __last,
+               input_iterator_tag)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+
+      typename iterator_traits<_InputIterator>::difference_type __n = 0;
+      while (__first != __last)
+	{
+	  ++__first;
+	  ++__n;
+	}
+      return __n;
+    }
+
+  template<typename _RandomAccessIterator>
+    inline _GLIBCXX14_CONSTEXPR
+    typename iterator_traits<_RandomAccessIterator>::difference_type
+    __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
+               random_access_iterator_tag)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_RandomAccessIteratorConcept<
+				  _RandomAccessIterator>)
+      return __last - __first;
+    }
+
+
+  // Forward declaration because of the qualified call in distance.
+  template<typename _Tp>
+    ptrdiff_t
+    __distance(_GLIBCXX_STD_C::_List_iterator<_Tp>,
+	       _GLIBCXX_STD_C::_List_iterator<_Tp>,
+	       input_iterator_tag);
+
+  template<typename _Tp>
+    ptrdiff_t
+    __distance(_GLIBCXX_STD_C::_List_const_iterator<_Tp>,
+	       _GLIBCXX_STD_C::_List_const_iterator<_Tp>,
+	       input_iterator_tag);
+
+
+  /**
+   *  @brief A generalization of pointer arithmetic.
+   *  @param  __first  An input iterator.
+   *  @param  __last  An input iterator.
+   *  @return  The distance between them.
+   *
+   *  Returns @c n such that __first + n == __last.  This requires
+   *  that @p __last must be reachable from @p __first.  Note that @c
+   *  n may be negative.
+   *
+   *  For random access iterators, this uses their @c + and @c - operations
+   *  and are constant time.  For other %iterator classes they are linear time.
+  */
+  template<typename _InputIterator>
+    inline _GLIBCXX17_CONSTEXPR
+    typename iterator_traits<_InputIterator>::difference_type
+    distance(_InputIterator __first, _InputIterator __last)
+    {
+      // concept requirements -- taken care of in __distance
+      return std::__distance(__first, __last,
+			     std::__iterator_category(__first));
+    }
+
+  template<typename _InputIterator, typename _Distance>
+    inline _GLIBCXX14_CONSTEXPR void
+    __advance(_InputIterator& __i, _Distance __n, input_iterator_tag)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+      __glibcxx_assert(__n >= 0);
+      while (__n--)
+	++__i;
+    }
+
+  template<typename _BidirectionalIterator, typename _Distance>
+    inline _GLIBCXX14_CONSTEXPR void
+    __advance(_BidirectionalIterator& __i, _Distance __n,
+	      bidirectional_iterator_tag)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_BidirectionalIteratorConcept<
+				  _BidirectionalIterator>)
+      if (__n > 0)
+        while (__n--)
+	  ++__i;
+      else
+        while (__n++)
+	  --__i;
+    }
+
+  template<typename _RandomAccessIterator, typename _Distance>
+    inline _GLIBCXX14_CONSTEXPR void
+    __advance(_RandomAccessIterator& __i, _Distance __n,
+              random_access_iterator_tag)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_RandomAccessIteratorConcept<
+				  _RandomAccessIterator>)
+      if (__builtin_constant_p(__n) && __n == 1)
+	++__i;
+      else if (__builtin_constant_p(__n) && __n == -1)
+	--__i;
+      else
+	__i += __n;
+    }
+
+  /**
+   *  @brief A generalization of pointer arithmetic.
+   *  @param  __i  An input iterator.
+   *  @param  __n  The @a delta by which to change @p __i.
+   *  @return  Nothing.
+   *
+   *  This increments @p i by @p n.  For bidirectional and random access
+   *  iterators, @p __n may be negative, in which case @p __i is decremented.
+   *
+   *  For random access iterators, this uses their @c + and @c - operations
+   *  and are constant time.  For other %iterator classes they are linear time.
+  */
+  template<typename _InputIterator, typename _Distance>
+    inline _GLIBCXX17_CONSTEXPR void
+    advance(_InputIterator& __i, _Distance __n)
+    {
+      // concept requirements -- taken care of in __advance
+      typename iterator_traits<_InputIterator>::difference_type __d = __n;
+      std::__advance(__i, __d, std::__iterator_category(__i));
+    }
+
+
+
+  template<typename _InputIterator>
+    inline _GLIBCXX17_CONSTEXPR _InputIterator
+    next(_InputIterator __x, typename
+	 iterator_traits<_InputIterator>::difference_type __n = 1)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+      std::advance(__x, __n);
+      return __x;
+    }
+
+  template<typename _BidirectionalIterator>
+    inline _GLIBCXX17_CONSTEXPR _BidirectionalIterator
+    prev(_BidirectionalIterator __x, typename
+	 iterator_traits<_BidirectionalIterator>::difference_type __n = 1) 
+    {
+      // concept requirements
+      __glibcxx_function_requires(_BidirectionalIteratorConcept<
+				  _BidirectionalIterator>)
+      std::advance(__x, -__n);
+      return __x;
+    }
+
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// Iterators -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_iterator.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iterator}
+ *
+ *  This file implements reverse_iterator, back_insert_iterator,
+ *  front_insert_iterator, insert_iterator, __normal_iterator, and their
+ *  supporting functions and overloaded operators.
+ */
+
+
+#define _STL_ITERATOR_H 1
+
+
+
+
+// Pointer Traits -*- C++ -*-
+
+// Copyright (C) 2011-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/ptr_traits.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{memory}
+ */
+
+
+#define _PTR_TRAITS_H 1
+
+
+
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  class __undefined;
+
+  // Given Template<T, ...> return T, otherwise invalid.
+  template<typename _Tp>
+    struct __get_first_arg
+    { using type = __undefined; };
+
+  template<template<typename, typename...> class _Template, typename _Tp,
+           typename... _Types>
+    struct __get_first_arg<_Template<_Tp, _Types...>>
+    { using type = _Tp; };
+
+  template<typename _Tp>
+    using __get_first_arg_t = typename __get_first_arg<_Tp>::type;
+
+  // Given Template<T, ...> and U return Template<U, ...>, otherwise invalid.
+  template<typename _Tp, typename _Up>
+    struct __replace_first_arg
+    { };
+
+  template<template<typename, typename...> class _Template, typename _Up,
+           typename _Tp, typename... _Types>
+    struct __replace_first_arg<_Template<_Tp, _Types...>, _Up>
+    { using type = _Template<_Up, _Types...>; };
+
+  template<typename _Tp, typename _Up>
+    using __replace_first_arg_t = typename __replace_first_arg<_Tp, _Up>::type;
+
+  template<typename _Tp>
+    using __make_not_void
+      = typename conditional<is_void<_Tp>::value, __undefined, _Tp>::type;
+
+  /**
+   * @brief  Uniform interface to all pointer-like types
+   * @ingroup pointer_abstractions
+  */
+  template<typename _Ptr>
+    struct pointer_traits
+    {
+    private:
+      template<typename _Tp>
+	using __element_type = typename _Tp::element_type;
+
+      template<typename _Tp>
+	using __difference_type = typename _Tp::difference_type;
+
+      template<typename _Tp, typename _Up, typename = void>
+	struct __rebind : __replace_first_arg<_Tp, _Up> { };
+
+      template<typename _Tp, typename _Up>
+	struct __rebind<_Tp, _Up, __void_t<typename _Tp::template rebind<_Up>>>
+	{ using type = typename _Tp::template rebind<_Up>; };
+
+    public:
+      /// The pointer type.
+      using pointer = _Ptr;
+
+      /// The type pointed to.
+      using element_type
+	= __detected_or_t<__get_first_arg_t<_Ptr>, __element_type, _Ptr>;
+
+      /// The type used to represent the difference between two pointers.
+      using difference_type
+	= __detected_or_t<ptrdiff_t, __difference_type, _Ptr>;
+
+      /// A pointer to a different type.
+      template<typename _Up>
+        using rebind = typename __rebind<_Ptr, _Up>::type;
+
+      static _Ptr
+      pointer_to(__make_not_void<element_type>& __e)
+      { return _Ptr::pointer_to(__e); }
+
+      static_assert(!is_same<element_type, __undefined>::value,
+	  "pointer type defines element_type or is like SomePointer<T, Args>");
+    };
+
+  /**
+   * @brief  Partial specialization for built-in pointers.
+   * @ingroup pointer_abstractions
+  */
+  template<typename _Tp>
+    struct pointer_traits<_Tp*>
+    {
+      /// The pointer type
+      typedef _Tp* pointer;
+      /// The type pointed to
+      typedef _Tp  element_type;
+      /// Type used to represent the difference between two pointers
+      typedef ptrdiff_t difference_type;
+
+      template<typename _Up>
+        using rebind = _Up*;
+
+      /**
+       *  @brief  Obtain a pointer to an object
+       *  @param  __r  A reference to an object of type @c element_type
+       *  @return @c addressof(__r)
+      */
+      static _GLIBCXX20_CONSTEXPR pointer
+      pointer_to(__make_not_void<element_type>& __r) noexcept
+      { return std::addressof(__r); }
+    };
+
+  /// Convenience alias for rebinding pointers.
+  template<typename _Ptr, typename _Tp>
+    using __ptr_rebind = typename pointer_traits<_Ptr>::template rebind<_Tp>;
+
+  template<typename _Tp>
+    constexpr _Tp*
+    __to_address(_Tp* __ptr) noexcept
+    {
+      static_assert(!std::is_function<_Tp>::value, "not a function pointer");
+      return __ptr;
+    }
+
+
+  template<typename _Ptr>
+    constexpr typename std::pointer_traits<_Ptr>::element_type*
+    __to_address(const _Ptr& __ptr)
+    { return std::__to_address(__ptr.operator->()); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+
+
+
+
+
+
+
+
+
+
+
+#define __cpp_lib_array_constexpr 201803L
+
+
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * @addtogroup iterators
+   * @{
+   */
+
+
+  // 24.4.1 Reverse iterators
+  /**
+   *  Bidirectional and random access iterators have corresponding reverse
+   *  %iterator adaptors that iterate through the data structure in the
+   *  opposite direction.  They have the same signatures as the corresponding
+   *  iterators.  The fundamental relation between a reverse %iterator and its
+   *  corresponding %iterator @c i is established by the identity:
+   *  @code
+   *      &*(reverse_iterator(i)) == &*(i - 1)
+   *  @endcode
+   *
+   *  <em>This mapping is dictated by the fact that while there is always a
+   *  pointer past the end of an array, there might not be a valid pointer
+   *  before the beginning of an array.</em> [24.4.1]/1,2
+   *
+   *  Reverse iterators can be tricky and surprising at first.  Their
+   *  semantics make sense, however, and the trickiness is a side effect of
+   *  the requirement that the iterators must be safe.
+  */
+  template<typename _Iterator>
+    class reverse_iterator
+    : public iterator<typename iterator_traits<_Iterator>::iterator_category,
+		      typename iterator_traits<_Iterator>::value_type,
+		      typename iterator_traits<_Iterator>::difference_type,
+		      typename iterator_traits<_Iterator>::pointer,
+                      typename iterator_traits<_Iterator>::reference>
+    {
+      template<typename _Iter>
+	friend class reverse_iterator;
+
+
+
+
+
+
+
+
+
+    protected:
+      _Iterator current;
+
+      typedef iterator_traits<_Iterator>		__traits_type;
+
+    public:
+      typedef _Iterator					iterator_type;
+      typedef typename __traits_type::difference_type	difference_type;
+      typedef typename __traits_type::pointer		pointer;
+      typedef typename __traits_type::reference		reference;
+
+
+      /**
+       *  The default constructor value-initializes member @p current.
+       *  If it is a pointer, that means it is zero-initialized.
+      */
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 235 No specification of default ctor for reverse_iterator
+      // 1012. reverse_iterator default ctor should value initialize
+      _GLIBCXX17_CONSTEXPR
+      reverse_iterator() : current() { }
+
+      /**
+       *  This %iterator will move in the opposite direction that @p x does.
+      */
+      explicit _GLIBCXX17_CONSTEXPR
+      reverse_iterator(iterator_type __x) : current(__x) { }
+
+      /**
+       *  The copy constructor is normal.
+      */
+      _GLIBCXX17_CONSTEXPR
+      reverse_iterator(const reverse_iterator& __x)
+      : current(__x.current) { }
+
+
+      reverse_iterator& operator=(const reverse_iterator&) = default;
+
+
+      /**
+       *  A %reverse_iterator across other types can be copied if the
+       *  underlying %iterator can be converted to the type of @c current.
+      */
+      template<typename _Iter>
+
+
+
+	_GLIBCXX17_CONSTEXPR
+        reverse_iterator(const reverse_iterator<_Iter>& __x)
+	: current(__x.current) { }
+
+
+      template<typename _Iter>
+
+
+
+
+	_GLIBCXX17_CONSTEXPR
+	reverse_iterator&
+	operator=(const reverse_iterator<_Iter>& __x)
+	{
+	  current = __x.current;
+	  return *this;
+	}
+
+
+      /**
+       *  @return  @c current, the %iterator used for underlying work.
+      */
+      _GLIBCXX17_CONSTEXPR iterator_type
+      base() const
+      { return current; }
+
+      /**
+       *  @return  A reference to the value at @c --current
+       *
+       *  This requires that @c --current is dereferenceable.
+       *
+       *  @warning This implementation requires that for an iterator of the
+       *           underlying iterator type, @c x, a reference obtained by
+       *           @c *x remains valid after @c x has been modified or
+       *           destroyed. This is a bug: http://gcc.gnu.org/PR51823
+      */
+      _GLIBCXX17_CONSTEXPR reference
+      operator*() const
+      {
+	_Iterator __tmp = current;
+	return *--__tmp;
+      }
+
+      /**
+       *  @return  A pointer to the value at @c --current
+       *
+       *  This requires that @c --current is dereferenceable.
+      */
+      _GLIBCXX17_CONSTEXPR pointer
+      operator->() const
+
+
+
+
+      {
+	// _GLIBCXX_RESOLVE_LIB_DEFECTS
+	// 1052. operator-> should also support smart pointers
+	_Iterator __tmp = current;
+	--__tmp;
+	return _S_to_pointer(__tmp);
+      }
+
+      /**
+       *  @return  @c *this
+       *
+       *  Decrements the underlying iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator&
+      operator++()
+      {
+	--current;
+	return *this;
+      }
+
+      /**
+       *  @return  The original value of @c *this
+       *
+       *  Decrements the underlying iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator
+      operator++(int)
+      {
+	reverse_iterator __tmp = *this;
+	--current;
+	return __tmp;
+      }
+
+      /**
+       *  @return  @c *this
+       *
+       *  Increments the underlying iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator&
+      operator--()
+      {
+	++current;
+	return *this;
+      }
+
+      /**
+       *  @return  A reverse_iterator with the previous value of @c *this
+       *
+       *  Increments the underlying iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator
+      operator--(int)
+      {
+	reverse_iterator __tmp = *this;
+	++current;
+	return __tmp;
+      }
+
+      /**
+       *  @return  A reverse_iterator that refers to @c current - @a __n
+       *
+       *  The underlying iterator must be a Random Access Iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator
+      operator+(difference_type __n) const
+      { return reverse_iterator(current - __n); }
+
+      /**
+       *  @return  *this
+       *
+       *  Moves the underlying iterator backwards @a __n steps.
+       *  The underlying iterator must be a Random Access Iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator&
+      operator+=(difference_type __n)
+      {
+	current -= __n;
+	return *this;
+      }
+
+      /**
+       *  @return  A reverse_iterator that refers to @c current - @a __n
+       *
+       *  The underlying iterator must be a Random Access Iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator
+      operator-(difference_type __n) const
+      { return reverse_iterator(current + __n); }
+
+      /**
+       *  @return  *this
+       *
+       *  Moves the underlying iterator forwards @a __n steps.
+       *  The underlying iterator must be a Random Access Iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reverse_iterator&
+      operator-=(difference_type __n)
+      {
+	current += __n;
+	return *this;
+      }
+
+      /**
+       *  @return  The value at @c current - @a __n - 1
+       *
+       *  The underlying iterator must be a Random Access Iterator.
+      */
+      _GLIBCXX17_CONSTEXPR reference
+      operator[](difference_type __n) const
+      { return *(*this + __n); }
+
+
+    private:
+      template<typename _Tp>
+	static _GLIBCXX17_CONSTEXPR _Tp*
+	_S_to_pointer(_Tp* __p)
+        { return __p; }
+
+      template<typename _Tp>
+	static _GLIBCXX17_CONSTEXPR pointer
+	_S_to_pointer(_Tp __t)
+        { return __t.operator->(); }
+    };
+
+  //@{
+  /**
+   *  @param  __x  A %reverse_iterator.
+   *  @param  __y  A %reverse_iterator.
+   *  @return  A simple bool.
+   *
+   *  Reverse iterators forward comparisons to their underlying base()
+   *  iterators.
+   *
+  */
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator==(const reverse_iterator<_Iterator>& __x,
+	       const reverse_iterator<_Iterator>& __y)
+    { return __x.base() == __y.base(); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<(const reverse_iterator<_Iterator>& __x,
+	      const reverse_iterator<_Iterator>& __y)
+    { return __y.base() < __x.base(); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator!=(const reverse_iterator<_Iterator>& __x,
+	       const reverse_iterator<_Iterator>& __y)
+    { return !(__x == __y); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>(const reverse_iterator<_Iterator>& __x,
+	      const reverse_iterator<_Iterator>& __y)
+    { return __y < __x; }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<=(const reverse_iterator<_Iterator>& __x,
+	       const reverse_iterator<_Iterator>& __y)
+    { return !(__y < __x); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>=(const reverse_iterator<_Iterator>& __x,
+	       const reverse_iterator<_Iterator>& __y)
+    { return !(__x < __y); }
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // DR 280. Comparison of reverse_iterator to const reverse_iterator.
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator==(const reverse_iterator<_IteratorL>& __x,
+	       const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() == __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<(const reverse_iterator<_IteratorL>& __x,
+	      const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() > __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator!=(const reverse_iterator<_IteratorL>& __x,
+	       const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() != __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>(const reverse_iterator<_IteratorL>& __x,
+	      const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() < __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<=(const reverse_iterator<_IteratorL>& __x,
+	       const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() >= __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>=(const reverse_iterator<_IteratorL>& __x,
+	       const reverse_iterator<_IteratorR>& __y)
+    { return __x.base() <= __y.base(); }
+  //@}
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // DR 685. reverse_iterator/move_iterator difference has invalid signatures
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR auto
+    operator-(const reverse_iterator<_IteratorL>& __x,
+	      const reverse_iterator<_IteratorR>& __y)
+    -> decltype(__y.base() - __x.base())
+    { return __y.base() - __x.base(); }
+
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator>
+    operator+(typename reverse_iterator<_Iterator>::difference_type __n,
+	      const reverse_iterator<_Iterator>& __x)
+    { return reverse_iterator<_Iterator>(__x.base() - __n); }
+
+
+  // Same as C++14 make_reverse_iterator but used in C++11 mode too.
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator>
+    __make_reverse_iterator(_Iterator __i)
+    { return reverse_iterator<_Iterator>(__i); }
+
+
+#define __cpp_lib_make_reverse_iterator 201402
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // DR 2285. make_reverse_iterator
+  /// Generator function for reverse_iterator.
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator>
+    make_reverse_iterator(_Iterator __i)
+    { return reverse_iterator<_Iterator>(__i); }
+
+
+
+
+
+
+
+
+
+
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    auto
+    __niter_base(reverse_iterator<_Iterator> __it)
+    -> decltype(__make_reverse_iterator(__niter_base(__it.base())))
+    { return __make_reverse_iterator(__niter_base(__it.base())); }
+
+  template<typename _Iterator>
+    struct __is_move_iterator<reverse_iterator<_Iterator> >
+      : __is_move_iterator<_Iterator>
+    { };
+
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    auto
+    __miter_base(reverse_iterator<_Iterator> __it)
+    -> decltype(__make_reverse_iterator(__miter_base(__it.base())))
+    { return __make_reverse_iterator(__miter_base(__it.base())); }
+
+
+  // 24.4.2.2.1 back_insert_iterator
+  /**
+   *  @brief  Turns assignment into insertion.
+   *
+   *  These are output iterators, constructed from a container-of-T.
+   *  Assigning a T to the iterator appends it to the container using
+   *  push_back.
+   *
+   *  Tip:  Using the back_inserter function to create these iterators can
+   *  save typing.
+  */
+  template<typename _Container>
+    class back_insert_iterator
+    : public iterator<output_iterator_tag, void, void, void, void>
+    {
+    protected:
+      _Container* container;
+
+    public:
+      /// A nested typedef for the type of whatever container you used.
+      typedef _Container          container_type;
+
+
+
+
+
+
+      /// The only way to create this %iterator is with a container.
+      explicit _GLIBCXX20_CONSTEXPR
+      back_insert_iterator(_Container& __x)
+      : container(std::__addressof(__x)) { }
+
+      /**
+       *  @param  __value  An instance of whatever type
+       *                 container_type::const_reference is; presumably a
+       *                 reference-to-const T for container<T>.
+       *  @return  This %iterator, for chained operations.
+       *
+       *  This kind of %iterator doesn't really have a @a position in the
+       *  container (you can think of the position as being permanently at
+       *  the end, if you like).  Assigning a value to the %iterator will
+       *  always append the value to the end of the container.
+      */
+      _GLIBCXX20_CONSTEXPR
+      back_insert_iterator&
+      operator=(const typename _Container::value_type& __value)
+      {
+	container->push_back(__value);
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR
+      back_insert_iterator&
+      operator=(typename _Container::value_type&& __value)
+      {
+	container->push_back(std::move(__value));
+	return *this;
+      }
+
+
+      /// Simply returns *this.
+      _GLIBCXX20_CONSTEXPR
+      back_insert_iterator&
+      operator*()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      back_insert_iterator&
+      operator++()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      back_insert_iterator
+      operator++(int)
+      { return *this; }
+    };
+
+  /**
+   *  @param  __x  A container of arbitrary type.
+   *  @return  An instance of back_insert_iterator working on @p __x.
+   *
+   *  This wrapper function helps in creating back_insert_iterator instances.
+   *  Typing the name of the %iterator requires knowing the precise full
+   *  type of the container, which can be tedious and impedes generic
+   *  programming.  Using this function lets you take advantage of automatic
+   *  template parameter deduction, making the compiler match the correct
+   *  types for you.
+  */
+  template<typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline back_insert_iterator<_Container>
+    back_inserter(_Container& __x)
+    { return back_insert_iterator<_Container>(__x); }
+
+  /**
+   *  @brief  Turns assignment into insertion.
+   *
+   *  These are output iterators, constructed from a container-of-T.
+   *  Assigning a T to the iterator prepends it to the container using
+   *  push_front.
+   *
+   *  Tip:  Using the front_inserter function to create these iterators can
+   *  save typing.
+  */
+  template<typename _Container>
+    class front_insert_iterator
+    : public iterator<output_iterator_tag, void, void, void, void>
+    {
+    protected:
+      _Container* container;
+
+    public:
+      /// A nested typedef for the type of whatever container you used.
+      typedef _Container          container_type;
+
+
+
+
+
+
+      /// The only way to create this %iterator is with a container.
+      explicit _GLIBCXX20_CONSTEXPR
+      front_insert_iterator(_Container& __x)
+      : container(std::__addressof(__x)) { }
+
+      /**
+       *  @param  __value  An instance of whatever type
+       *                 container_type::const_reference is; presumably a
+       *                 reference-to-const T for container<T>.
+       *  @return  This %iterator, for chained operations.
+       *
+       *  This kind of %iterator doesn't really have a @a position in the
+       *  container (you can think of the position as being permanently at
+       *  the front, if you like).  Assigning a value to the %iterator will
+       *  always prepend the value to the front of the container.
+      */
+      _GLIBCXX20_CONSTEXPR
+      front_insert_iterator&
+      operator=(const typename _Container::value_type& __value)
+      {
+	container->push_front(__value);
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR
+      front_insert_iterator&
+      operator=(typename _Container::value_type&& __value)
+      {
+	container->push_front(std::move(__value));
+	return *this;
+      }
+
+
+      /// Simply returns *this.
+      _GLIBCXX20_CONSTEXPR
+      front_insert_iterator&
+      operator*()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      front_insert_iterator&
+      operator++()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      front_insert_iterator
+      operator++(int)
+      { return *this; }
+    };
+
+  /**
+   *  @param  __x  A container of arbitrary type.
+   *  @return  An instance of front_insert_iterator working on @p x.
+   *
+   *  This wrapper function helps in creating front_insert_iterator instances.
+   *  Typing the name of the %iterator requires knowing the precise full
+   *  type of the container, which can be tedious and impedes generic
+   *  programming.  Using this function lets you take advantage of automatic
+   *  template parameter deduction, making the compiler match the correct
+   *  types for you.
+  */
+  template<typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline front_insert_iterator<_Container>
+    front_inserter(_Container& __x)
+    { return front_insert_iterator<_Container>(__x); }
+
+  /**
+   *  @brief  Turns assignment into insertion.
+   *
+   *  These are output iterators, constructed from a container-of-T.
+   *  Assigning a T to the iterator inserts it in the container at the
+   *  %iterator's position, rather than overwriting the value at that
+   *  position.
+   *
+   *  (Sequences will actually insert a @e copy of the value before the
+   *  %iterator's position.)
+   *
+   *  Tip:  Using the inserter function to create these iterators can
+   *  save typing.
+  */
+  template<typename _Container>
+    class insert_iterator
+    : public iterator<output_iterator_tag, void, void, void, void>
+    {
+
+
+
+
+
+
+
+      typedef typename _Container::iterator		_Iter;
+
+    protected:
+      _Container* container;
+      _Iter iter;
+
+
+    public:
+      /// A nested typedef for the type of whatever container you used.
+      typedef _Container          container_type;
+
+
+
+
+
+
+
+      /**
+       *  The only way to create this %iterator is with a container and an
+       *  initial position (a normal %iterator into the container).
+      */
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator(_Container& __x, _Iter __i)
+      : container(std::__addressof(__x)), iter(__i) {}
+
+      /**
+       *  @param  __value  An instance of whatever type
+       *                 container_type::const_reference is; presumably a
+       *                 reference-to-const T for container<T>.
+       *  @return  This %iterator, for chained operations.
+       *
+       *  This kind of %iterator maintains its own position in the
+       *  container.  Assigning a value to the %iterator will insert the
+       *  value into the container at the place before the %iterator.
+       *
+       *  The position is maintained such that subsequent assignments will
+       *  insert values immediately after one another.  For example,
+       *  @code
+       *     // vector v contains A and Z
+       *
+       *     insert_iterator i (v, ++v.begin());
+       *     i = 1;
+       *     i = 2;
+       *     i = 3;
+       *
+       *     // vector v contains A, 1, 2, 3, and Z
+       *  @endcode
+      */
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator&
+      operator=(const typename _Container::value_type& __value)
+      {
+	iter = container->insert(iter, __value);
+	++iter;
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator&
+      operator=(typename _Container::value_type&& __value)
+      {
+	iter = container->insert(iter, std::move(__value));
+	++iter;
+	return *this;
+      }
+
+
+      /// Simply returns *this.
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator&
+      operator*()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator&
+      operator++()
+      { return *this; }
+
+      /// Simply returns *this.  (This %iterator does not @a move.)
+      _GLIBCXX20_CONSTEXPR
+      insert_iterator&
+      operator++(int)
+      { return *this; }
+    };
+
+  /**
+   *  @param __x  A container of arbitrary type.
+   *  @param __i  An iterator into the container.
+   *  @return  An instance of insert_iterator working on @p __x.
+   *
+   *  This wrapper function helps in creating insert_iterator instances.
+   *  Typing the name of the %iterator requires knowing the precise full
+   *  type of the container, which can be tedious and impedes generic
+   *  programming.  Using this function lets you take advantage of automatic
+   *  template parameter deduction, making the compiler match the correct
+   *  types for you.
+  */
+
+
+
+
+
+
+  template<typename _Container>
+    inline insert_iterator<_Container>
+    inserter(_Container& __x, typename _Container::iterator __i)
+    { return insert_iterator<_Container>(__x, __i); }
+
+
+  // @} group iterators
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // This iterator adapter is @a normal in the sense that it does not
+  // change the semantics of any of the operators of its iterator
+  // parameter.  Its primary purpose is to convert an iterator that is
+  // not a class, e.g. a pointer, into an iterator that is a class.
+  // The _Container parameter exists solely so that different containers
+  // using this template can instantiate different types, even if the
+  // _Iterator parameter is the same.
+  template<typename _Iterator, typename _Container>
+    class __normal_iterator
+    {
+    protected:
+      _Iterator _M_current;
+
+      typedef std::iterator_traits<_Iterator>		__traits_type;
+
+    public:
+      typedef _Iterator					iterator_type;
+      typedef typename __traits_type::iterator_category iterator_category;
+      typedef typename __traits_type::value_type  	value_type;
+      typedef typename __traits_type::difference_type 	difference_type;
+      typedef typename __traits_type::reference 	reference;
+      typedef typename __traits_type::pointer   	pointer;
+
+
+
+
+
+      _GLIBCXX_CONSTEXPR __normal_iterator() _GLIBCXX_NOEXCEPT
+      : _M_current(_Iterator()) { }
+
+      explicit _GLIBCXX20_CONSTEXPR
+      __normal_iterator(const _Iterator& __i) _GLIBCXX_NOEXCEPT
+      : _M_current(__i) { }
+
+      // Allow iterator to const_iterator conversion
+      template<typename _Iter>
+        _GLIBCXX20_CONSTEXPR
+        __normal_iterator(const __normal_iterator<_Iter,
+			  typename __enable_if<
+      	       (std::__are_same<_Iter, typename _Container::pointer>::__value),
+		      _Container>::__type>& __i) _GLIBCXX_NOEXCEPT
+        : _M_current(__i.base()) { }
+
+      // Forward iterator requirements
+      _GLIBCXX20_CONSTEXPR
+      reference
+      operator*() const _GLIBCXX_NOEXCEPT
+      { return *_M_current; }
+
+      _GLIBCXX20_CONSTEXPR
+      pointer
+      operator->() const _GLIBCXX_NOEXCEPT
+      { return _M_current; }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator&
+      operator++() _GLIBCXX_NOEXCEPT
+      {
+	++_M_current;
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator
+      operator++(int) _GLIBCXX_NOEXCEPT
+      { return __normal_iterator(_M_current++); }
+
+      // Bidirectional iterator requirements
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator&
+      operator--() _GLIBCXX_NOEXCEPT
+      {
+	--_M_current;
+	return *this;
+      }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator
+      operator--(int) _GLIBCXX_NOEXCEPT
+      { return __normal_iterator(_M_current--); }
+
+      // Random access iterator requirements
+      _GLIBCXX20_CONSTEXPR
+      reference
+      operator[](difference_type __n) const _GLIBCXX_NOEXCEPT
+      { return _M_current[__n]; }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator&
+      operator+=(difference_type __n) _GLIBCXX_NOEXCEPT
+      { _M_current += __n; return *this; }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator
+      operator+(difference_type __n) const _GLIBCXX_NOEXCEPT
+      { return __normal_iterator(_M_current + __n); }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator&
+      operator-=(difference_type __n) _GLIBCXX_NOEXCEPT
+      { _M_current -= __n; return *this; }
+
+      _GLIBCXX20_CONSTEXPR
+      __normal_iterator
+      operator-(difference_type __n) const _GLIBCXX_NOEXCEPT
+      { return __normal_iterator(_M_current - __n); }
+
+      _GLIBCXX20_CONSTEXPR
+      const _Iterator&
+      base() const _GLIBCXX_NOEXCEPT
+      { return _M_current; }
+    };
+
+  // Note: In what follows, the left- and right-hand-side iterators are
+  // allowed to vary in types (conceptually in cv-qualification) so that
+  // comparison between cv-qualified and non-cv-qualified iterators be
+  // valid.  However, the greedy and unfriendly operators in std::rel_ops
+  // will make overload resolution ambiguous (when in scope) if we don't
+  // provide overloads whose operands are of the same type.  Can someone
+  // remind me what generic programming is about? -- Gaby
+
+   // Forward iterator requirements
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	       const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() == __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
+	       const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() == __rhs.base(); }
+
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator!=(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	       const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() != __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator!=(const __normal_iterator<_Iterator, _Container>& __lhs,
+	       const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() != __rhs.base(); }
+
+  // Random access iterator requirements
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    inline bool
+    operator<(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	      const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() < __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator<(const __normal_iterator<_Iterator, _Container>& __lhs,
+	      const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() < __rhs.base(); }
+
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    inline bool
+    operator>(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	      const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() > __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator>(const __normal_iterator<_Iterator, _Container>& __lhs,
+	      const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() > __rhs.base(); }
+
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    inline bool
+    operator<=(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	       const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() <= __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator<=(const __normal_iterator<_Iterator, _Container>& __lhs,
+	       const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() <= __rhs.base(); }
+
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+    inline bool
+    operator>=(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	       const __normal_iterator<_IteratorR, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() >= __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    operator>=(const __normal_iterator<_Iterator, _Container>& __lhs,
+	       const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() >= __rhs.base(); }
+
+
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // According to the resolution of DR179 not only the various comparison
+  // operators but also operator- must accept mixed iterator/const_iterator
+  // parameters.
+  template<typename _IteratorL, typename _IteratorR, typename _Container>
+
+    // DR 685.
+    _GLIBCXX20_CONSTEXPR
+    inline auto
+    operator-(const __normal_iterator<_IteratorL, _Container>& __lhs,
+	      const __normal_iterator<_IteratorR, _Container>& __rhs) noexcept
+    -> decltype(__lhs.base() - __rhs.base())
+
+
+
+
+
+    { return __lhs.base() - __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline typename __normal_iterator<_Iterator, _Container>::difference_type
+    operator-(const __normal_iterator<_Iterator, _Container>& __lhs,
+	      const __normal_iterator<_Iterator, _Container>& __rhs)
+    _GLIBCXX_NOEXCEPT
+    { return __lhs.base() - __rhs.base(); }
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    inline __normal_iterator<_Iterator, _Container>
+    operator+(typename __normal_iterator<_Iterator, _Container>::difference_type
+	      __n, const __normal_iterator<_Iterator, _Container>& __i)
+    _GLIBCXX_NOEXCEPT
+    { return __normal_iterator<_Iterator, _Container>(__i.base() + __n); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  template<typename _Iterator, typename _Container>
+    _GLIBCXX20_CONSTEXPR
+    _Iterator
+    __niter_base(__gnu_cxx::__normal_iterator<_Iterator, _Container> __it)
+    _GLIBCXX_NOEXCEPT_IF(std::is_nothrow_copy_constructible<_Iterator>::value)
+    { return __it.base(); }
+
+
+  /**
+   * @addtogroup iterators
+   * @{
+   */
+
+
+  // 24.4.3  Move iterators
+  /**
+   *  Class template move_iterator is an iterator adapter with the same
+   *  behavior as the underlying iterator except that its dereference
+   *  operator implicitly converts the value returned by the underlying
+   *  iterator's dereference operator to an rvalue reference.  Some
+   *  generic algorithms can be called with move iterators to replace
+   *  copying with moving.
+   */
+  template<typename _Iterator>
+    class move_iterator
+    {
+      _Iterator _M_current;
+
+      using __traits_type = iterator_traits<_Iterator>;
+
+
+
+      using __base_ref = typename __traits_type::reference;
+
+
+      template<typename _Iter2>
+	friend class move_iterator;
+
+
+
+
+
+
+
+
+
+    public:
+      using iterator_type = _Iterator;
+
+      typedef typename __traits_type::iterator_category iterator_category;
+      typedef typename __traits_type::value_type  	value_type;
+      typedef typename __traits_type::difference_type	difference_type;
+      // NB: DR 680.
+      typedef _Iterator					pointer;
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 2106. move_iterator wrapping iterators returning prvalues
+      typedef typename conditional<is_reference<__base_ref>::value,
+			 typename remove_reference<__base_ref>::type&&,
+			 __base_ref>::type		reference;
+
+
+      _GLIBCXX17_CONSTEXPR
+      move_iterator()
+      : _M_current() { }
+
+      explicit _GLIBCXX17_CONSTEXPR
+      move_iterator(iterator_type __i)
+      : _M_current(std::move(__i)) { }
+
+      template<typename _Iter>
+
+
+
+	_GLIBCXX17_CONSTEXPR
+	move_iterator(const move_iterator<_Iter>& __i)
+	: _M_current(__i._M_current) { }
+
+      template<typename _Iter>
+
+
+
+
+	_GLIBCXX17_CONSTEXPR
+	move_iterator& operator=(const move_iterator<_Iter>& __i)
+	{
+	  _M_current = __i._M_current;
+	  return *this;
+	}
+
+
+      _GLIBCXX17_CONSTEXPR iterator_type
+      base() const
+      { return _M_current; }
+
+      _GLIBCXX17_CONSTEXPR reference
+      operator*() const
+
+
+
+      { return static_cast<reference>(*_M_current); }
+
+
+      _GLIBCXX17_CONSTEXPR pointer
+      operator->() const
+      { return _M_current; }
+
+      _GLIBCXX17_CONSTEXPR move_iterator&
+      operator++()
+      {
+	++_M_current;
+	return *this;
+      }
+
+      _GLIBCXX17_CONSTEXPR move_iterator
+      operator++(int)
+      {
+	move_iterator __tmp = *this;
+	++_M_current;
+	return __tmp;
+      }
+
+
+
+
+
+
+
+      _GLIBCXX17_CONSTEXPR move_iterator&
+      operator--()
+      {
+	--_M_current;
+	return *this;
+      }
+
+      _GLIBCXX17_CONSTEXPR move_iterator
+      operator--(int)
+      {
+	move_iterator __tmp = *this;
+	--_M_current;
+	return __tmp;
+      }
+
+      _GLIBCXX17_CONSTEXPR move_iterator
+      operator+(difference_type __n) const
+      { return move_iterator(_M_current + __n); }
+
+      _GLIBCXX17_CONSTEXPR move_iterator&
+      operator+=(difference_type __n)
+      {
+	_M_current += __n;
+	return *this;
+      }
+
+      _GLIBCXX17_CONSTEXPR move_iterator
+      operator-(difference_type __n) const
+      { return move_iterator(_M_current - __n); }
+    
+      _GLIBCXX17_CONSTEXPR move_iterator&
+      operator-=(difference_type __n)
+      { 
+	_M_current -= __n;
+	return *this;
+      }
+
+      _GLIBCXX17_CONSTEXPR reference
+      operator[](difference_type __n) const
+
+
+
+      { return std::move(_M_current[__n]); }
+
+
+    };
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator==(const move_iterator<_IteratorL>& __x,
+	       const move_iterator<_IteratorR>& __y)
+
+
+
+    { return __x.base() == __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator!=(const move_iterator<_IteratorL>& __x,
+	       const move_iterator<_IteratorR>& __y)
+    { return !(__x == __y); }
+
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<(const move_iterator<_IteratorL>& __x,
+	      const move_iterator<_IteratorR>& __y)
+
+
+
+    { return __x.base() < __y.base(); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<=(const move_iterator<_IteratorL>& __x,
+	       const move_iterator<_IteratorR>& __y)
+
+
+
+    { return !(__y < __x); }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>(const move_iterator<_IteratorL>& __x,
+	      const move_iterator<_IteratorR>& __y)
+
+
+
+    { return __y < __x; }
+
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>=(const move_iterator<_IteratorL>& __x,
+	       const move_iterator<_IteratorR>& __y)
+
+
+
+    { return !(__x < __y); }
+
+
+  // Note: See __normal_iterator operators note from Gaby to understand
+  // why we have these extra overloads for some move_iterator operators.
+
+  // These extra overloads are not needed in C++20, because the ones above
+  // are constrained with a requires-clause and so overload resolution will
+  // prefer them to greedy unconstrained function templates.
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator==(const move_iterator<_Iterator>& __x,
+	       const move_iterator<_Iterator>& __y)
+    { return __x.base() == __y.base(); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator!=(const move_iterator<_Iterator>& __x,
+	       const move_iterator<_Iterator>& __y)
+    { return !(__x == __y); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<(const move_iterator<_Iterator>& __x,
+	      const move_iterator<_Iterator>& __y)
+    { return __x.base() < __y.base(); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator<=(const move_iterator<_Iterator>& __x,
+	       const move_iterator<_Iterator>& __y)
+    { return !(__y < __x); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>(const move_iterator<_Iterator>& __x,
+	      const move_iterator<_Iterator>& __y)
+    { return __y < __x; }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR bool
+    operator>=(const move_iterator<_Iterator>& __x,
+	       const move_iterator<_Iterator>& __y)
+    { return !(__x < __y); }
+
+
+  // DR 685.
+  template<typename _IteratorL, typename _IteratorR>
+    inline _GLIBCXX17_CONSTEXPR auto
+    operator-(const move_iterator<_IteratorL>& __x,
+	      const move_iterator<_IteratorR>& __y)
+    -> decltype(__x.base() - __y.base())
+    { return __x.base() - __y.base(); }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR move_iterator<_Iterator>
+    operator+(typename move_iterator<_Iterator>::difference_type __n,
+	      const move_iterator<_Iterator>& __x)
+    { return __x + __n; }
+
+  template<typename _Iterator>
+    inline _GLIBCXX17_CONSTEXPR move_iterator<_Iterator>
+    make_move_iterator(_Iterator __i)
+    { return move_iterator<_Iterator>(std::move(__i)); }
+
+  template<typename _Iterator, typename _ReturnType
+    = typename conditional<__move_if_noexcept_cond
+      <typename iterator_traits<_Iterator>::value_type>::value,
+                _Iterator, move_iterator<_Iterator>>::type>
+    inline _GLIBCXX17_CONSTEXPR _ReturnType
+    __make_move_if_noexcept_iterator(_Iterator __i)
+    { return _ReturnType(__i); }
+
+  // Overload for pointers that matches std::move_if_noexcept more closely,
+  // returning a constant iterator when we don't want to move.
+  template<typename _Tp, typename _ReturnType
+    = typename conditional<__move_if_noexcept_cond<_Tp>::value,
+			   const _Tp*, move_iterator<_Tp*>>::type>
+    inline _GLIBCXX17_CONSTEXPR _ReturnType
+    __make_move_if_noexcept_iterator(_Tp* __i)
+    { return _ReturnType(__i); }
+
+
+  // @} group iterators
+
+  template<typename _Iterator>
+    auto
+    __niter_base(move_iterator<_Iterator> __it)
+    -> decltype(make_move_iterator(__niter_base(__it.base())))
+    { return make_move_iterator(__niter_base(__it.base())); }
+
+  template<typename _Iterator>
+    struct __is_move_iterator<move_iterator<_Iterator> >
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+
+  template<typename _Iterator>
+    auto
+    __miter_base(move_iterator<_Iterator> __it)
+    -> decltype(__miter_base(__it.base()))
+    { return __miter_base(__it.base()); }
+
+#define _GLIBCXX_MAKE_MOVE_ITERATOR(_Iter) std::make_move_iterator(_Iter)
+#define _GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(_Iter) std::__make_move_if_noexcept_iterator(_Iter)
+
+
+
+
+
+
+
+  // These helper traits are used for deduction guides
+  // of associative containers.
+  template<typename _InputIterator>
+    using __iter_key_t = remove_const_t<
+    typename iterator_traits<_InputIterator>::value_type::first_type>;
+
+  template<typename _InputIterator>
+    using __iter_val_t =
+    typename iterator_traits<_InputIterator>::value_type::second_type;
+
+  template<typename _T1, typename _T2>
+    struct pair;
+
+  template<typename _InputIterator>
+    using __iter_to_alloc_t =
+    pair<add_const_t<__iter_key_t<_InputIterator>>,
+	 __iter_val_t<_InputIterator>>;
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+
+
+
+
+// Debugging support implementation -*- C++ -*-
+
+// Copyright (C) 2003-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file debug/debug.h
+ *  This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+
+#define _GLIBCXX_DEBUG_MACRO_SWITCH_H 1
+
+/** Macros and namespaces used by the implementation outside of debug
+ *  wrappers to verify certain properties. The __glibcxx_requires_xxx
+ *  macros are merely wrappers around the __glibcxx_check_xxx wrappers
+ *  when we are compiling with debug mode, but disappear when we are
+ *  in release mode so that there is no checking performed in, e.g.,
+ *  the standard library algorithms.
+*/
+
+
+
+// Debug mode namespaces.
+
+/**
+ * @namespace std::__debug
+ * @brief GNU debug code, replaces standard behavior with debug behavior.
+ */
+namespace std
+{ 
+  namespace __debug { } 
+}
+
+/** @namespace __gnu_debug
+ *  @brief GNU debug classes for public use.
+*/
+namespace __gnu_debug
+{
+  using namespace std::__debug;
+
+  template<typename _Ite, typename _Seq, typename _Cat>
+    struct _Safe_iterator;
+}
+
+
+
+#define __glibcxx_requires_cond(_Cond,_Msg) 
+#define __glibcxx_requires_valid_range(_First,_Last) 
+#define __glibcxx_requires_can_increment(_First,_Size) 
+#define __glibcxx_requires_can_increment_range(_First1,_Last1,_First2) 
+#define __glibcxx_requires_can_decrement_range(_First1,_Last1,_First2) 
+#define __glibcxx_requires_sorted(_First,_Last) 
+#define __glibcxx_requires_sorted_pred(_First,_Last,_Pred) 
+#define __glibcxx_requires_sorted_set(_First1,_Last1,_First2) 
+#define __glibcxx_requires_sorted_set_pred(_First1,_Last1,_First2,_Pred) 
+#define __glibcxx_requires_partitioned_lower(_First,_Last,_Value) 
+#define __glibcxx_requires_partitioned_upper(_First,_Last,_Value) 
+#define __glibcxx_requires_partitioned_lower_pred(_First,_Last,_Value,_Pred) 
+#define __glibcxx_requires_partitioned_upper_pred(_First,_Last,_Value,_Pred) 
+#define __glibcxx_requires_heap(_First,_Last) 
+#define __glibcxx_requires_heap_pred(_First,_Last,_Pred) 
+#define __glibcxx_requires_string(_String) 
+#define __glibcxx_requires_string_len(_String,_Len) 
+#define __glibcxx_requires_irreflexive(_First,_Last) 
+#define __glibcxx_requires_irreflexive2(_First,_Last) 
+#define __glibcxx_requires_irreflexive_pred(_First,_Last,_Pred) 
+#define __glibcxx_requires_irreflexive_pred2(_First,_Last,_Pred) 
+
+
+
+// Default predicates for internal use -*- C++ -*-
+
+// Copyright (C) 2013-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file predefined_ops.h
+ *  This is an internal header file, included by other library headers.
+ *  You should not attempt to use it directly. @headername{algorithm}
+ */
+
+
+#define _GLIBCXX_PREDEFINED_OPS_H 1
+
+namespace __gnu_cxx
+{
+namespace __ops
+{
+  struct _Iter_less_iter
+  {
+    template<typename _Iterator1, typename _Iterator2>
+      _GLIBCXX14_CONSTEXPR
+      bool
+      operator()(_Iterator1 __it1, _Iterator2 __it2) const
+      { return *__it1 < *__it2; }
+  };
+
+  _GLIBCXX14_CONSTEXPR
+  inline _Iter_less_iter
+  __iter_less_iter()
+  { return _Iter_less_iter(); }
+
+  struct _Iter_less_val
+  {
+
+    constexpr _Iter_less_val() = default;
+
+
+
+
+    _GLIBCXX20_CONSTEXPR
+    explicit
+    _Iter_less_val(_Iter_less_iter) { }
+
+    template<typename _Iterator, typename _Value>
+      _GLIBCXX20_CONSTEXPR
+      bool
+      operator()(_Iterator __it, _Value& __val) const
+      { return *__it < __val; }
+  };
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Iter_less_val
+  __iter_less_val()
+  { return _Iter_less_val(); }
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Iter_less_val
+  __iter_comp_val(_Iter_less_iter)
+  { return _Iter_less_val(); }
+
+  struct _Val_less_iter
+  {
+
+    constexpr _Val_less_iter() = default;
+
+
+
+
+    _GLIBCXX20_CONSTEXPR
+    explicit
+    _Val_less_iter(_Iter_less_iter) { }
+
+    template<typename _Value, typename _Iterator>
+      _GLIBCXX20_CONSTEXPR
+      bool
+      operator()(_Value& __val, _Iterator __it) const
+      { return __val < *__it; }
+  };
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Val_less_iter
+  __val_less_iter()
+  { return _Val_less_iter(); }
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Val_less_iter
+  __val_comp_iter(_Iter_less_iter)
+  { return _Val_less_iter(); }
+
+  struct _Iter_equal_to_iter
+  {
+    template<typename _Iterator1, typename _Iterator2>
+      _GLIBCXX20_CONSTEXPR
+      bool
+      operator()(_Iterator1 __it1, _Iterator2 __it2) const
+      { return *__it1 == *__it2; }
+  };
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Iter_equal_to_iter
+  __iter_equal_to_iter()
+  { return _Iter_equal_to_iter(); }
+
+  struct _Iter_equal_to_val
+  {
+    template<typename _Iterator, typename _Value>
+      _GLIBCXX20_CONSTEXPR
+      bool
+      operator()(_Iterator __it, _Value& __val) const
+      { return *__it == __val; }
+  };
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Iter_equal_to_val
+  __iter_equal_to_val()
+  { return _Iter_equal_to_val(); }
+
+  _GLIBCXX20_CONSTEXPR
+  inline _Iter_equal_to_val
+  __iter_comp_val(_Iter_equal_to_iter)
+  { return _Iter_equal_to_val(); }
+
+  template<typename _Compare>
+    struct _Iter_comp_iter
+    {
+      _Compare _M_comp;
+
+      explicit _GLIBCXX14_CONSTEXPR
+      _Iter_comp_iter(_Compare __comp)
+	: _M_comp(_GLIBCXX_MOVE(__comp))
+      { }
+
+      template<typename _Iterator1, typename _Iterator2>
+        _GLIBCXX14_CONSTEXPR
+        bool
+        operator()(_Iterator1 __it1, _Iterator2 __it2)
+        { return bool(_M_comp(*__it1, *__it2)); }
+    };
+
+  template<typename _Compare>
+    _GLIBCXX14_CONSTEXPR
+    inline _Iter_comp_iter<_Compare>
+    __iter_comp_iter(_Compare __comp)
+    { return _Iter_comp_iter<_Compare>(_GLIBCXX_MOVE(__comp)); }
+
+  template<typename _Compare>
+    struct _Iter_comp_val
+    {
+      _Compare _M_comp;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_comp_val(_Compare __comp)
+	: _M_comp(_GLIBCXX_MOVE(__comp))
+      { }
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_comp_val(const _Iter_comp_iter<_Compare>& __comp)
+	: _M_comp(__comp._M_comp)
+      { }
+
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_comp_val(_Iter_comp_iter<_Compare>&& __comp)
+	: _M_comp(std::move(__comp._M_comp))
+      { }
+
+
+      template<typename _Iterator, typename _Value>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator __it, _Value& __val)
+	{ return bool(_M_comp(*__it, __val)); }
+    };
+
+  template<typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_comp_val<_Compare>
+    __iter_comp_val(_Compare __comp)
+    { return _Iter_comp_val<_Compare>(_GLIBCXX_MOVE(__comp)); }
+
+  template<typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_comp_val<_Compare>
+    __iter_comp_val(_Iter_comp_iter<_Compare> __comp)
+    { return _Iter_comp_val<_Compare>(_GLIBCXX_MOVE(__comp)); }
+
+  template<typename _Compare>
+    struct _Val_comp_iter
+    {
+      _Compare _M_comp;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Val_comp_iter(_Compare __comp)
+	: _M_comp(_GLIBCXX_MOVE(__comp))
+      { }
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Val_comp_iter(const _Iter_comp_iter<_Compare>& __comp)
+	: _M_comp(__comp._M_comp)
+      { }
+
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Val_comp_iter(_Iter_comp_iter<_Compare>&& __comp)
+	: _M_comp(std::move(__comp._M_comp))
+      { }
+
+
+      template<typename _Value, typename _Iterator>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Value& __val, _Iterator __it)
+	{ return bool(_M_comp(__val, *__it)); }
+    };
+
+  template<typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    inline _Val_comp_iter<_Compare>
+    __val_comp_iter(_Compare __comp)
+    { return _Val_comp_iter<_Compare>(_GLIBCXX_MOVE(__comp)); }
+
+  template<typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    inline _Val_comp_iter<_Compare>
+    __val_comp_iter(_Iter_comp_iter<_Compare> __comp)
+    { return _Val_comp_iter<_Compare>(_GLIBCXX_MOVE(__comp)); }
+
+  template<typename _Value>
+    struct _Iter_equals_val
+    {
+      _Value& _M_value;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_equals_val(_Value& __value)
+	: _M_value(__value)
+      { }
+
+      template<typename _Iterator>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator __it)
+	{ return *__it == _M_value; }
+    };
+
+  template<typename _Value>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_equals_val<_Value>
+    __iter_equals_val(_Value& __val)
+    { return _Iter_equals_val<_Value>(__val); }
+
+  template<typename _Iterator1>
+    struct _Iter_equals_iter
+    {
+      _Iterator1 _M_it1;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_equals_iter(_Iterator1 __it1)
+	: _M_it1(__it1)
+      { }
+
+      template<typename _Iterator2>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator2 __it2)
+	{ return *__it2 == *_M_it1; }
+    };
+
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_equals_iter<_Iterator>
+    __iter_comp_iter(_Iter_equal_to_iter, _Iterator __it)
+    { return _Iter_equals_iter<_Iterator>(__it); }
+
+  template<typename _Predicate>
+    struct _Iter_pred
+    {
+      _Predicate _M_pred;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_pred(_Predicate __pred)
+	: _M_pred(_GLIBCXX_MOVE(__pred))
+      { }
+
+      template<typename _Iterator>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator __it)
+	{ return bool(_M_pred(*__it)); }
+    };
+
+  template<typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_pred<_Predicate>
+    __pred_iter(_Predicate __pred)
+    { return _Iter_pred<_Predicate>(_GLIBCXX_MOVE(__pred)); }
+
+  template<typename _Compare, typename _Value>
+    struct _Iter_comp_to_val
+    {
+      _Compare _M_comp;
+      _Value& _M_value;
+
+      _GLIBCXX20_CONSTEXPR
+      _Iter_comp_to_val(_Compare __comp, _Value& __value)
+	: _M_comp(_GLIBCXX_MOVE(__comp)), _M_value(__value)
+      { }
+
+      template<typename _Iterator>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator __it)
+	{ return bool(_M_comp(*__it, _M_value)); }
+    };
+
+  template<typename _Compare, typename _Value>
+    _Iter_comp_to_val<_Compare, _Value>
+    _GLIBCXX20_CONSTEXPR
+    __iter_comp_val(_Compare __comp, _Value &__val)
+    {
+      return _Iter_comp_to_val<_Compare, _Value>(_GLIBCXX_MOVE(__comp), __val);
+    }
+
+  template<typename _Compare, typename _Iterator1>
+    struct _Iter_comp_to_iter
+    {
+      _Compare _M_comp;
+      _Iterator1 _M_it1;
+
+      _GLIBCXX20_CONSTEXPR
+      _Iter_comp_to_iter(_Compare __comp, _Iterator1 __it1)
+	: _M_comp(_GLIBCXX_MOVE(__comp)), _M_it1(__it1)
+      { }
+
+      template<typename _Iterator2>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator2 __it2)
+	{ return bool(_M_comp(*__it2, *_M_it1)); }
+    };
+
+  template<typename _Compare, typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_comp_to_iter<_Compare, _Iterator>
+    __iter_comp_iter(_Iter_comp_iter<_Compare> __comp, _Iterator __it)
+    {
+      return _Iter_comp_to_iter<_Compare, _Iterator>(
+	  _GLIBCXX_MOVE(__comp._M_comp), __it);
+    }
+
+  template<typename _Predicate>
+    struct _Iter_negate
+    {
+      _Predicate _M_pred;
+
+      _GLIBCXX20_CONSTEXPR
+      explicit
+      _Iter_negate(_Predicate __pred)
+	: _M_pred(_GLIBCXX_MOVE(__pred))
+      { }
+
+      template<typename _Iterator>
+	_GLIBCXX20_CONSTEXPR
+	bool
+	operator()(_Iterator __it)
+	{ return !bool(_M_pred(*__it)); }
+    };
+
+  template<typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iter_negate<_Predicate>
+    __negate(_Iter_pred<_Predicate> __pred)
+    { return _Iter_negate<_Predicate>(_GLIBCXX_MOVE(__pred._M_pred)); }
+
+} // namespace __ops
+} // namespace __gnu_cxx
+
+
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /*
+   * A constexpr wrapper for __builtin_memcmp.
+   * @param __num The number of elements of type _Tp (not bytes).
+   */
+  template<typename _Tp, typename _Up>
+    _GLIBCXX14_CONSTEXPR
+    inline int
+    __memcmp(const _Tp* __first1, const _Up* __first2, size_t __num)
+    {
+
+      static_assert(sizeof(_Tp) == sizeof(_Up), "can be compared with memcmp");
+
+	return __builtin_memcmp(__first1, __first2, sizeof(_Tp) * __num);
+    }
+
+
+  /**
+   *  @brief Swaps the contents of two iterators.
+   *  @ingroup mutating_algorithms
+   *  @param  __a  An iterator.
+   *  @param  __b  Another iterator.
+   *  @return   Nothing.
+   *
+   *  This function swaps the values pointed to by two iterators, not the
+   *  iterators themselves.
+  */
+  template<typename _ForwardIterator1, typename _ForwardIterator2>
+    _GLIBCXX20_CONSTEXPR
+    inline void
+    iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+				  _ForwardIterator1>)
+      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+				  _ForwardIterator2>)
+
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 187. iter_swap underspecified
+      swap(*__a, *__b);
+
+    }
+
+  /**
+   *  @brief Swap the elements of two sequences.
+   *  @ingroup mutating_algorithms
+   *  @param  __first1  A forward iterator.
+   *  @param  __last1   A forward iterator.
+   *  @param  __first2  A forward iterator.
+   *  @return   An iterator equal to @p first2+(last1-first1).
+   *
+   *  Swaps each element in the range @p [first1,last1) with the
+   *  corresponding element in the range @p [first2,(last1-first1)).
+   *  The ranges must not overlap.
+  */
+  template<typename _ForwardIterator1, typename _ForwardIterator2>
+    _GLIBCXX20_CONSTEXPR
+    _ForwardIterator2
+    swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+		_ForwardIterator2 __first2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+				  _ForwardIterator1>)
+      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+				  _ForwardIterator2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+
+      for (; __first1 != __last1; ++__first1, (void)++__first2)
+	std::iter_swap(__first1, __first2);
+      return __first2;
+    }
+
+  /**
+   *  @brief This does what you think it does.
+   *  @ingroup sorting_algorithms
+   *  @param  __a  A thing of arbitrary type.
+   *  @param  __b  Another thing of arbitrary type.
+   *  @return   The lesser of the parameters.
+   *
+   *  This is the simple classic generic implementation.  It will work on
+   *  temporary expressions, since they are only evaluated once, unlike a
+   *  preprocessor macro.
+  */
+  template<typename _Tp>
+    _GLIBCXX14_CONSTEXPR
+    inline const _Tp&
+    min(const _Tp& __a, const _Tp& __b)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
+      //return __b < __a ? __b : __a;
+      if (__b < __a)
+	return __b;
+      return __a;
+    }
+
+  /**
+   *  @brief This does what you think it does.
+   *  @ingroup sorting_algorithms
+   *  @param  __a  A thing of arbitrary type.
+   *  @param  __b  Another thing of arbitrary type.
+   *  @return   The greater of the parameters.
+   *
+   *  This is the simple classic generic implementation.  It will work on
+   *  temporary expressions, since they are only evaluated once, unlike a
+   *  preprocessor macro.
+  */
+  template<typename _Tp>
+    _GLIBCXX14_CONSTEXPR
+    inline const _Tp&
+    max(const _Tp& __a, const _Tp& __b)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
+      //return  __a < __b ? __b : __a;
+      if (__a < __b)
+	return __b;
+      return __a;
+    }
+
+  /**
+   *  @brief This does what you think it does.
+   *  @ingroup sorting_algorithms
+   *  @param  __a  A thing of arbitrary type.
+   *  @param  __b  Another thing of arbitrary type.
+   *  @param  __comp  A @link comparison_functors comparison functor@endlink.
+   *  @return   The lesser of the parameters.
+   *
+   *  This will work on temporary expressions, since they are only evaluated
+   *  once, unlike a preprocessor macro.
+  */
+  template<typename _Tp, typename _Compare>
+    _GLIBCXX14_CONSTEXPR
+    inline const _Tp&
+    min(const _Tp& __a, const _Tp& __b, _Compare __comp)
+    {
+      //return __comp(__b, __a) ? __b : __a;
+      if (__comp(__b, __a))
+	return __b;
+      return __a;
+    }
+
+  /**
+   *  @brief This does what you think it does.
+   *  @ingroup sorting_algorithms
+   *  @param  __a  A thing of arbitrary type.
+   *  @param  __b  Another thing of arbitrary type.
+   *  @param  __comp  A @link comparison_functors comparison functor@endlink.
+   *  @return   The greater of the parameters.
+   *
+   *  This will work on temporary expressions, since they are only evaluated
+   *  once, unlike a preprocessor macro.
+  */
+  template<typename _Tp, typename _Compare>
+    _GLIBCXX14_CONSTEXPR
+    inline const _Tp&
+    max(const _Tp& __a, const _Tp& __b, _Compare __comp)
+    {
+      //return __comp(__a, __b) ? __b : __a;
+      if (__comp(__a, __b))
+	return __b;
+      return __a;
+    }
+
+  // Fallback implementation of the function in bits/stl_iterator.h used to
+  // remove the __normal_iterator wrapper. See copy, fill, ...
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iterator
+    __niter_base(_Iterator __it)
+    _GLIBCXX_NOEXCEPT_IF(std::is_nothrow_copy_constructible<_Iterator>::value)
+    { return __it; }
+
+  template<typename _Ite, typename _Seq>
+    _Ite
+    __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
+		 std::random_access_iterator_tag>&);
+
+  // Reverse the __niter_base transformation to get a
+  // __normal_iterator back again (this assumes that __normal_iterator
+  // is only used to wrap random access iterators, like pointers).
+  template<typename _From, typename _To>
+    _GLIBCXX20_CONSTEXPR
+    inline _From
+    __niter_wrap(_From __from, _To __res)
+    { return __from + (__res - std::__niter_base(__from)); }
+
+  // No need to wrap, iterator already has the right type.
+  template<typename _Iterator>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iterator
+    __niter_wrap(const _Iterator&, _Iterator __res)
+    { return __res; }
+
+  // All of these auxiliary structs serve two purposes.  (1) Replace
+  // calls to copy with memmove whenever possible.  (Memmove, not memcpy,
+  // because the input and output ranges are permitted to overlap.)
+  // (2) If we're using random access iterators, then write the loop as
+  // a for loop with an explicit count.
+
+  template<bool _IsMove, bool _IsSimple, typename _Category>
+    struct __copy_move
+    {
+      template<typename _II, typename _OI>
+	_GLIBCXX20_CONSTEXPR
+	static _OI
+	__copy_m(_II __first, _II __last, _OI __result)
+	{
+	  for (; __first != __last; ++__result, (void)++__first)
+	    *__result = *__first;
+	  return __result;
+	}
+    };
+
+
+  template<typename _Category>
+    struct __copy_move<true, false, _Category>
+    {
+      template<typename _II, typename _OI>
+	_GLIBCXX20_CONSTEXPR
+	static _OI
+	__copy_m(_II __first, _II __last, _OI __result)
+	{
+	  for (; __first != __last; ++__result, (void)++__first)
+	    *__result = std::move(*__first);
+	  return __result;
+	}
+    };
+
+
+  template<>
+    struct __copy_move<false, false, random_access_iterator_tag>
+    {
+      template<typename _II, typename _OI>
+	_GLIBCXX20_CONSTEXPR
+	static _OI
+	__copy_m(_II __first, _II __last, _OI __result)
+	{
+	  typedef typename iterator_traits<_II>::difference_type _Distance;
+	  for(_Distance __n = __last - __first; __n > 0; --__n)
+	    {
+	      *__result = *__first;
+	      ++__first;
+	      ++__result;
+	    }
+	  return __result;
+	}
+    };
+
+
+  template<>
+    struct __copy_move<true, false, random_access_iterator_tag>
+    {
+      template<typename _II, typename _OI>
+	_GLIBCXX20_CONSTEXPR
+	static _OI
+	__copy_m(_II __first, _II __last, _OI __result)
+	{
+	  typedef typename iterator_traits<_II>::difference_type _Distance;
+	  for(_Distance __n = __last - __first; __n > 0; --__n)
+	    {
+	      *__result = std::move(*__first);
+	      ++__first;
+	      ++__result;
+	    }
+	  return __result;
+	}
+    };
+
+
+  template<bool _IsMove>
+    struct __copy_move<_IsMove, true, random_access_iterator_tag>
+    {
+      template<typename _Tp>
+	_GLIBCXX20_CONSTEXPR
+	static _Tp*
+	__copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
+	{
+
+	  using __assignable = conditional<_IsMove,
+					   is_move_assignable<_Tp>,
+					   is_copy_assignable<_Tp>>;
+	  // trivial types can have deleted assignment
+	  static_assert( __assignable::type::value, "type is not assignable" );
+
+	  const ptrdiff_t _Num = __last - __first;
+	  if (_Num)
+	    __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
+	  return __result + _Num;
+	}
+    };
+
+_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+
+  template<typename _Tp, typename _Ref, typename _Ptr>
+    struct _Deque_iterator;
+
+  struct _Bit_iterator;
+
+_GLIBCXX_END_NAMESPACE_CONTAINER
+
+  // Helpers for streambuf iterators (either istream or ostream).
+  // NB: avoid including <iosfwd>, relatively large.
+  template<typename _CharT>
+    struct char_traits;
+
+  template<typename _CharT, typename _Traits>
+    class istreambuf_iterator;
+
+  template<typename _CharT, typename _Traits>
+    class ostreambuf_iterator;
+
+  template<bool _IsMove, typename _CharT>
+    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+	     ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
+    __copy_move_a2(_CharT*, _CharT*,
+		   ostreambuf_iterator<_CharT, char_traits<_CharT> >);
+
+  template<bool _IsMove, typename _CharT>
+    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+	     ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
+    __copy_move_a2(const _CharT*, const _CharT*,
+		   ostreambuf_iterator<_CharT, char_traits<_CharT> >);
+
+  template<bool _IsMove, typename _CharT>
+    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+				    _CharT*>::__type
+    __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
+		   istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
+
+  template<bool _IsMove, typename _CharT>
+    typename __gnu_cxx::__enable_if<
+      __is_char<_CharT>::__value,
+      _GLIBCXX_STD_C::_Deque_iterator<_CharT, _CharT&, _CharT*> >::__type
+    __copy_move_a2(
+	istreambuf_iterator<_CharT, char_traits<_CharT> >,
+	istreambuf_iterator<_CharT, char_traits<_CharT> >,
+	_GLIBCXX_STD_C::_Deque_iterator<_CharT, _CharT&, _CharT*>);
+
+  template<bool _IsMove, typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    __copy_move_a2(_II __first, _II __last, _OI __result)
+    {
+      typedef typename iterator_traits<_II>::iterator_category _Category;
+
+
+
+
+
+      return std::__copy_move<_IsMove, __memcpyable<_OI, _II>::__value,
+			      _Category>::__copy_m(__first, __last, __result);
+    }
+
+  template<bool _IsMove,
+	   typename _Tp, typename _Ref, typename _Ptr, typename _OI>
+    _OI
+    __copy_move_a1(_GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+		   _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+		   _OI);
+
+  template<bool _IsMove,
+	   typename _ITp, typename _IRef, typename _IPtr, typename _OTp>
+    _GLIBCXX_STD_C::_Deque_iterator<_OTp, _OTp&, _OTp*>
+    __copy_move_a1(_GLIBCXX_STD_C::_Deque_iterator<_ITp, _IRef, _IPtr>,
+		   _GLIBCXX_STD_C::_Deque_iterator<_ITp, _IRef, _IPtr>,
+		   _GLIBCXX_STD_C::_Deque_iterator<_OTp, _OTp&, _OTp*>);
+
+  template<bool _IsMove, typename _II, typename _Tp>
+    typename __gnu_cxx::__enable_if<
+      __is_random_access_iter<_II>::__value,
+      _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*> >::__type
+    __copy_move_a1(_II, _II, _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>);
+
+  template<bool _IsMove, typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    __copy_move_a1(_II __first, _II __last, _OI __result)
+    { return std::__copy_move_a2<_IsMove>(__first, __last, __result); }
+
+  template<bool _IsMove, typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    __copy_move_a(_II __first, _II __last, _OI __result)
+    {
+      return std::__niter_wrap(__result,
+		std::__copy_move_a1<_IsMove>(std::__niter_base(__first),
+					     std::__niter_base(__last),
+					     std::__niter_base(__result)));
+    }
+
+  template<bool _IsMove,
+	   typename _Ite, typename _Seq, typename _Cat, typename _OI>
+    _OI
+    __copy_move_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+		  const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+		  _OI);
+
+  template<bool _IsMove,
+	   typename _II, typename _Ite, typename _Seq, typename _Cat>
+    __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
+    __copy_move_a(_II, _II,
+		  const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&);
+
+  template<bool _IsMove,
+	   typename _IIte, typename _ISeq, typename _ICat,
+	   typename _OIte, typename _OSeq, typename _OCat>
+    ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>
+    __copy_move_a(const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>&,
+		  const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>&,
+		  const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>&);
+
+  template<typename _InputIterator, typename _Size, typename _OutputIterator>
+    _GLIBCXX20_CONSTEXPR
+    _OutputIterator
+    __copy_n_a(_InputIterator __first, _Size __n, _OutputIterator __result,
+	       bool)
+    {
+      if (__n > 0)
+	{
+	  while (true)
+	    {
+	      *__result = *__first;
+	      ++__result;
+	      if (--__n > 0)
+		++__first;
+	      else
+		break;
+	    }
+	}
+      return __result;
+    }
+
+  template<typename _CharT, typename _Size>
+    typename __gnu_cxx::__enable_if<
+      __is_char<_CharT>::__value, _CharT*>::__type
+    __copy_n_a(istreambuf_iterator<_CharT, char_traits<_CharT> >,
+	       _Size, _CharT*, bool);
+
+  template<typename _CharT, typename _Size>
+    typename __gnu_cxx::__enable_if<
+      __is_char<_CharT>::__value,
+      _GLIBCXX_STD_C::_Deque_iterator<_CharT, _CharT&, _CharT*> >::__type
+    __copy_n_a(istreambuf_iterator<_CharT, char_traits<_CharT> >, _Size,
+	       _GLIBCXX_STD_C::_Deque_iterator<_CharT, _CharT&, _CharT*>,
+	       bool);
+
+  /**
+   *  @brief Copies the range [first,last) into result.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  An input iterator.
+   *  @param  __last   An input iterator.
+   *  @param  __result An output iterator.
+   *  @return   result + (last - first)
+   *
+   *  This inline function will boil down to a call to @c memmove whenever
+   *  possible.  Failing that, if random access iterators are passed, then the
+   *  loop count will be known (and therefore a candidate for compiler
+   *  optimizations such as unrolling).  Result may not be contained within
+   *  [first,last); the copy_backward function should be used instead.
+   *
+   *  Note that the end of the output range is permitted to be contained
+   *  within [first,last).
+  */
+  template<typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    copy(_II __first, _II __last, _OI __result)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_II>)
+      __glibcxx_function_requires(_OutputIteratorConcept<_OI,
+	    typename iterator_traits<_II>::value_type>)
+      __glibcxx_requires_can_increment_range(__first, __last, __result);
+
+      return std::__copy_move_a<__is_move_iterator<_II>::__value>
+	     (std::__miter_base(__first), std::__miter_base(__last), __result);
+    }
+
+
+  /**
+   *  @brief Moves the range [first,last) into result.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  An input iterator.
+   *  @param  __last   An input iterator.
+   *  @param  __result An output iterator.
+   *  @return   result + (last - first)
+   *
+   *  This inline function will boil down to a call to @c memmove whenever
+   *  possible.  Failing that, if random access iterators are passed, then the
+   *  loop count will be known (and therefore a candidate for compiler
+   *  optimizations such as unrolling).  Result may not be contained within
+   *  [first,last); the move_backward function should be used instead.
+   *
+   *  Note that the end of the output range is permitted to be contained
+   *  within [first,last).
+  */
+  template<typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    move(_II __first, _II __last, _OI __result)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_II>)
+      __glibcxx_function_requires(_OutputIteratorConcept<_OI,
+	    typename iterator_traits<_II>::value_type>)
+      __glibcxx_requires_can_increment_range(__first, __last, __result);
+
+      return std::__copy_move_a<true>(std::__miter_base(__first),
+				      std::__miter_base(__last), __result);
+    }
+
+#define _GLIBCXX_MOVE3(_Tp,_Up,_Vp) std::move(_Tp, _Up, _Vp)
+
+
+
+
+  template<bool _IsMove, bool _IsSimple, typename _Category>
+    struct __copy_move_backward
+    {
+      template<typename _BI1, typename _BI2>
+	_GLIBCXX20_CONSTEXPR
+	static _BI2
+	__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+	{
+	  while (__first != __last)
+	    *--__result = *--__last;
+	  return __result;
+	}
+    };
+
+
+  template<typename _Category>
+    struct __copy_move_backward<true, false, _Category>
+    {
+      template<typename _BI1, typename _BI2>
+	_GLIBCXX20_CONSTEXPR
+	static _BI2
+	__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+	{
+	  while (__first != __last)
+	    *--__result = std::move(*--__last);
+	  return __result;
+	}
+    };
+
+
+  template<>
+    struct __copy_move_backward<false, false, random_access_iterator_tag>
+    {
+      template<typename _BI1, typename _BI2>
+	_GLIBCXX20_CONSTEXPR
+	static _BI2
+	__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+	{
+	  typename iterator_traits<_BI1>::difference_type
+	    __n = __last - __first;
+	  for (; __n > 0; --__n)
+	    *--__result = *--__last;
+	  return __result;
+	}
+    };
+
+
+  template<>
+    struct __copy_move_backward<true, false, random_access_iterator_tag>
+    {
+      template<typename _BI1, typename _BI2>
+	_GLIBCXX20_CONSTEXPR
+	static _BI2
+	__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+	{
+	  typename iterator_traits<_BI1>::difference_type
+	    __n = __last - __first;
+	  for (; __n > 0; --__n)
+	    *--__result = std::move(*--__last);
+	  return __result;
+	}
+    };
+
+
+  template<bool _IsMove>
+    struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
+    {
+      template<typename _Tp>
+	_GLIBCXX20_CONSTEXPR
+	static _Tp*
+	__copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
+	{
+
+	  using __assignable = conditional<_IsMove,
+					   is_move_assignable<_Tp>,
+					   is_copy_assignable<_Tp>>;
+	  // trivial types can have deleted assignment
+	  static_assert( __assignable::type::value, "type is not assignable" );
+
+	  const ptrdiff_t _Num = __last - __first;
+	  if (_Num)
+	    __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
+	  return __result - _Num;
+	}
+    };
+
+  template<bool _IsMove, typename _BI1, typename _BI2>
+    _GLIBCXX20_CONSTEXPR
+    inline _BI2
+    __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
+    {
+      typedef typename iterator_traits<_BI1>::iterator_category _Category;
+
+
+
+
+
+      return std::__copy_move_backward<_IsMove,
+				       __memcpyable<_BI2, _BI1>::__value,
+				       _Category>::__copy_move_b(__first,
+								 __last,
+								 __result);
+    }
+
+  template<bool _IsMove, typename _BI1, typename _BI2>
+    _GLIBCXX20_CONSTEXPR
+    inline _BI2
+    __copy_move_backward_a1(_BI1 __first, _BI1 __last, _BI2 __result)
+    { return std::__copy_move_backward_a2<_IsMove>(__first, __last, __result); }
+
+  template<bool _IsMove,
+	   typename _Tp, typename _Ref, typename _Ptr, typename _OI>
+    _OI
+    __copy_move_backward_a1(_GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+			    _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+			    _OI);
+
+  template<bool _IsMove,
+	   typename _ITp, typename _IRef, typename _IPtr, typename _OTp>
+    _GLIBCXX_STD_C::_Deque_iterator<_OTp, _OTp&, _OTp*>
+    __copy_move_backward_a1(
+			_GLIBCXX_STD_C::_Deque_iterator<_ITp, _IRef, _IPtr>,
+			_GLIBCXX_STD_C::_Deque_iterator<_ITp, _IRef, _IPtr>,
+			_GLIBCXX_STD_C::_Deque_iterator<_OTp, _OTp&, _OTp*>);
+
+  template<bool _IsMove, typename _II, typename _Tp>
+    typename __gnu_cxx::__enable_if<
+      __is_random_access_iter<_II>::__value,
+      _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*> >::__type
+    __copy_move_backward_a1(_II, _II,
+			    _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>);
+
+  template<bool _IsMove, typename _II, typename _OI>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    __copy_move_backward_a(_II __first, _II __last, _OI __result)
+    {
+      return std::__niter_wrap(__result,
+		std::__copy_move_backward_a1<_IsMove>
+		  (std::__niter_base(__first), std::__niter_base(__last),
+		   std::__niter_base(__result)));
+    }
+
+  template<bool _IsMove,
+	   typename _Ite, typename _Seq, typename _Cat, typename _OI>
+    _OI
+    __copy_move_backward_a(
+		const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+		const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+		_OI);
+
+  template<bool _IsMove,
+	   typename _II, typename _Ite, typename _Seq, typename _Cat>
+    __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
+    __copy_move_backward_a(_II, _II,
+		const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&);
+
+  template<bool _IsMove,
+	   typename _IIte, typename _ISeq, typename _ICat,
+	   typename _OIte, typename _OSeq, typename _OCat>
+    ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>
+    __copy_move_backward_a(
+		const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>&,
+		const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>&,
+		const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>&);
+
+  /**
+   *  @brief Copies the range [first,last) into result.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  A bidirectional iterator.
+   *  @param  __last   A bidirectional iterator.
+   *  @param  __result A bidirectional iterator.
+   *  @return   result - (last - first)
+   *
+   *  The function has the same effect as copy, but starts at the end of the
+   *  range and works its way to the start, returning the start of the result.
+   *  This inline function will boil down to a call to @c memmove whenever
+   *  possible.  Failing that, if random access iterators are passed, then the
+   *  loop count will be known (and therefore a candidate for compiler
+   *  optimizations such as unrolling).
+   *
+   *  Result may not be in the range (first,last].  Use copy instead.  Note
+   *  that the start of the output range may overlap [first,last).
+  */
+  template<typename _BI1, typename _BI2>
+    _GLIBCXX20_CONSTEXPR
+    inline _BI2
+    copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
+      __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
+      __glibcxx_function_requires(_ConvertibleConcept<
+	    typename iterator_traits<_BI1>::value_type,
+	    typename iterator_traits<_BI2>::value_type>)
+      __glibcxx_requires_can_decrement_range(__first, __last, __result);
+
+      return std::__copy_move_backward_a<__is_move_iterator<_BI1>::__value>
+	     (std::__miter_base(__first), std::__miter_base(__last), __result);
+    }
+
+
+  /**
+   *  @brief Moves the range [first,last) into result.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  A bidirectional iterator.
+   *  @param  __last   A bidirectional iterator.
+   *  @param  __result A bidirectional iterator.
+   *  @return   result - (last - first)
+   *
+   *  The function has the same effect as move, but starts at the end of the
+   *  range and works its way to the start, returning the start of the result.
+   *  This inline function will boil down to a call to @c memmove whenever
+   *  possible.  Failing that, if random access iterators are passed, then the
+   *  loop count will be known (and therefore a candidate for compiler
+   *  optimizations such as unrolling).
+   *
+   *  Result may not be in the range (first,last].  Use move instead.  Note
+   *  that the start of the output range may overlap [first,last).
+  */
+  template<typename _BI1, typename _BI2>
+    _GLIBCXX20_CONSTEXPR
+    inline _BI2
+    move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
+      __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
+      __glibcxx_function_requires(_ConvertibleConcept<
+	    typename iterator_traits<_BI1>::value_type,
+	    typename iterator_traits<_BI2>::value_type>)
+      __glibcxx_requires_can_decrement_range(__first, __last, __result);
+
+      return std::__copy_move_backward_a<true>(std::__miter_base(__first),
+					       std::__miter_base(__last),
+					       __result);
+    }
+
+#define _GLIBCXX_MOVE_BACKWARD3(_Tp,_Up,_Vp) std::move_backward(_Tp, _Up, _Vp)
+
+
+
+
+  template<typename _ForwardIterator, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline typename
+    __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
+    __fill_a1(_ForwardIterator __first, _ForwardIterator __last,
+	      const _Tp& __value)
+    {
+      for (; __first != __last; ++__first)
+	*__first = __value;
+    }
+
+  template<typename _ForwardIterator, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline typename
+    __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
+    __fill_a1(_ForwardIterator __first, _ForwardIterator __last,
+	      const _Tp& __value)
+    {
+      const _Tp __tmp = __value;
+      for (; __first != __last; ++__first)
+	*__first = __tmp;
+    }
+
+  // Specialization: for char types we can use memset.
+  template<typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline typename
+    __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
+    __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
+    {
+      const _Tp __tmp = __c;
+      if (const size_t __len = __last - __first)
+	__builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
+    }
+
+  template<typename _Ite, typename _Cont, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline void
+    __fill_a1(::__gnu_cxx::__normal_iterator<_Ite, _Cont> __first,
+	      ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
+	      const _Tp& __value)
+    { std::__fill_a1(__first.base(), __last.base(), __value); }
+
+  template<typename _Tp, typename _VTp>
+    void
+    __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
+	      const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
+	      const _VTp&);
+
+  void
+  __fill_a1(_GLIBCXX_STD_C::_Bit_iterator, _GLIBCXX_STD_C::_Bit_iterator,
+	    const bool&);
+
+  template<typename _FIte, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline void
+    __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
+    { std::__fill_a1(__first, __last, __value); }
+
+  template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
+    void
+    __fill_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+	     const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>&,
+	     const _Tp&);
+
+  /**
+   *  @brief Fills the range [first,last) with copies of value.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  A forward iterator.
+   *  @param  __last   A forward iterator.
+   *  @param  __value  A reference-to-const of arbitrary type.
+   *  @return   Nothing.
+   *
+   *  This function fills a range with copies of the same value.  For char
+   *  types filling contiguous areas of memory, this becomes an inline call
+   *  to @c memset or @c wmemset.
+  */
+  template<typename _ForwardIterator, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline void
+    fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+				  _ForwardIterator>)
+      __glibcxx_requires_valid_range(__first, __last);
+
+      std::__fill_a(__first, __last, __value);
+    }
+
+  // Used by fill_n, generate_n, etc. to convert _Size to an integral type:
+  inline _GLIBCXX_CONSTEXPR int
+  __size_to_integer(int __n) { return __n; }
+  inline _GLIBCXX_CONSTEXPR unsigned
+  __size_to_integer(unsigned __n) { return __n; }
+  inline _GLIBCXX_CONSTEXPR long
+  __size_to_integer(long __n) { return __n; }
+  inline _GLIBCXX_CONSTEXPR unsigned long
+  __size_to_integer(unsigned long __n) { return __n; }
+  inline _GLIBCXX_CONSTEXPR long long
+  __size_to_integer(long long __n) { return __n; }
+  inline _GLIBCXX_CONSTEXPR unsigned long long
+  __size_to_integer(unsigned long long __n) { return __n; }
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+  inline _GLIBCXX_CONSTEXPR long long
+  __size_to_integer(float __n) { return (long long)__n; }
+  inline _GLIBCXX_CONSTEXPR long long
+  __size_to_integer(double __n) { return (long long)__n; }
+  inline _GLIBCXX_CONSTEXPR long long
+  __size_to_integer(long double __n) { return (long long)__n; }
+
+
+
+
+
+  template<typename _OutputIterator, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline typename
+    __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
+    __fill_n_a1(_OutputIterator __first, _Size __n, const _Tp& __value)
+    {
+      for (; __n > 0; --__n, (void) ++__first)
+	*__first = __value;
+      return __first;
+    }
+
+  template<typename _OutputIterator, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline typename
+    __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
+    __fill_n_a1(_OutputIterator __first, _Size __n, const _Tp& __value)
+    {
+      const _Tp __tmp = __value;
+      for (; __n > 0; --__n, (void) ++__first)
+	*__first = __tmp;
+      return __first;
+    }
+
+  template<typename _Ite, typename _Seq, typename _Cat, typename _Size,
+	   typename _Tp>
+    ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>
+    __fill_n_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first,
+	       _Size __n, const _Tp& __value,
+	       std::input_iterator_tag);
+
+  template<typename _OutputIterator, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _OutputIterator
+    __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value,
+	       std::output_iterator_tag)
+    {
+
+      static_assert(is_integral<_Size>{}, "fill_n must pass integral size");
+
+      return __fill_n_a1(__first, __n, __value);
+    }
+
+  template<typename _OutputIterator, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _OutputIterator
+    __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value,
+	       std::input_iterator_tag)
+    {
+
+      static_assert(is_integral<_Size>{}, "fill_n must pass integral size");
+
+      return __fill_n_a1(__first, __n, __value);
+    }
+
+  template<typename _OutputIterator, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _OutputIterator
+    __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value,
+	       std::random_access_iterator_tag)
+    {
+
+      static_assert(is_integral<_Size>{}, "fill_n must pass integral size");
+
+      if (__n <= 0)
+	return __first;
+
+      __glibcxx_requires_can_increment(__first, __n);
+
+      std::__fill_a(__first, __first + __n, __value);
+      return __first + __n;
+    }
+
+  /**
+   *  @brief Fills the range [first,first+n) with copies of value.
+   *  @ingroup mutating_algorithms
+   *  @param  __first  An output iterator.
+   *  @param  __n      The count of copies to perform.
+   *  @param  __value  A reference-to-const of arbitrary type.
+   *  @return   The iterator at first+n.
+   *
+   *  This function fills a range with copies of the same value.  For char
+   *  types filling contiguous areas of memory, this becomes an inline call
+   *  to @c memset or @c wmemset.
+   *
+   *  If @p __n is negative, the function does nothing.
+  */
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // DR 865. More algorithms that throw away information
+  // DR 426. search_n(), fill_n(), and generate_n() with negative n
+  template<typename _OI, typename _Size, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _OI
+    fill_n(_OI __first, _Size __n, const _Tp& __value)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
+
+      return std::__fill_n_a(__first, std::__size_to_integer(__n), __value,
+			       std::__iterator_category(__first));
+    }
+
+  template<bool _BoolType>
+    struct __equal
+    {
+      template<typename _II1, typename _II2>
+	_GLIBCXX20_CONSTEXPR
+	static bool
+	equal(_II1 __first1, _II1 __last1, _II2 __first2)
+	{
+	  for (; __first1 != __last1; ++__first1, (void) ++__first2)
+	    if (!(*__first1 == *__first2))
+	      return false;
+	  return true;
+	}
+    };
+
+  template<>
+    struct __equal<true>
+    {
+      template<typename _Tp>
+	_GLIBCXX20_CONSTEXPR
+	static bool
+	equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
+	{
+	  if (const size_t __len = (__last1 - __first1))
+	    return !std::__memcmp(__first1, __first2, __len);
+	  return true;
+	}
+    };
+
+  template<typename _Tp, typename _Ref, typename _Ptr, typename _II>
+    typename __gnu_cxx::__enable_if<
+      __is_random_access_iter<_II>::__value, bool>::__type
+    __equal_aux1(_GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+		 _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>,
+		 _II);
+
+  template<typename _Tp1, typename _Ref1, typename _Ptr1,
+	   typename _Tp2, typename _Ref2, typename _Ptr2>
+    bool
+    __equal_aux1(_GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+		 _GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+		 _GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>);
+
+  template<typename _II, typename _Tp, typename _Ref, typename _Ptr>
+    typename __gnu_cxx::__enable_if<
+      __is_random_access_iter<_II>::__value, bool>::__type
+    __equal_aux1(_II, _II,
+		_GLIBCXX_STD_C::_Deque_iterator<_Tp, _Ref, _Ptr>);
+
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __equal_aux1(_II1 __first1, _II1 __last1, _II2 __first2)
+    {
+      typedef typename iterator_traits<_II1>::value_type _ValueType1;
+      const bool __simple = ((__is_integer<_ValueType1>::__value
+			      || __is_pointer<_ValueType1>::__value)
+			     && __memcmpable<_II1, _II2>::__value);
+      return std::__equal<__simple>::equal(__first1, __last1, __first2);
+    }
+
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
+    {
+      return std::__equal_aux1(std::__niter_base(__first1),
+			       std::__niter_base(__last1),
+			       std::__niter_base(__first2));
+    }
+
+  template<typename _II1, typename _Seq1, typename _Cat1, typename _II2>
+    bool
+    __equal_aux(const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>&,
+		_II2);
+
+  template<typename _II1, typename _II2, typename _Seq2, typename _Cat2>
+    bool
+    __equal_aux(_II1, _II1,
+		const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>&);
+
+  template<typename _II1, typename _Seq1, typename _Cat1,
+	   typename _II2, typename _Seq2, typename _Cat2>
+    bool
+    __equal_aux(const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>&);
+
+  template<typename, typename>
+    struct __lc_rai
+    {
+      template<typename _II1, typename _II2>
+	_GLIBCXX20_CONSTEXPR
+	static _II1
+	__newlast1(_II1, _II1 __last1, _II2, _II2)
+	{ return __last1; }
+
+      template<typename _II>
+	_GLIBCXX20_CONSTEXPR
+	static bool
+	__cnd2(_II __first, _II __last)
+	{ return __first != __last; }
+    };
+
+  template<>
+    struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
+    {
+      template<typename _RAI1, typename _RAI2>
+	_GLIBCXX20_CONSTEXPR
+	static _RAI1
+	__newlast1(_RAI1 __first1, _RAI1 __last1,
+		   _RAI2 __first2, _RAI2 __last2)
+	{
+	  const typename iterator_traits<_RAI1>::difference_type
+	    __diff1 = __last1 - __first1;
+	  const typename iterator_traits<_RAI2>::difference_type
+	    __diff2 = __last2 - __first2;
+	  return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
+	}
+
+      template<typename _RAI>
+	static _GLIBCXX20_CONSTEXPR bool
+	__cnd2(_RAI, _RAI)
+	{ return true; }
+    };
+
+  template<typename _II1, typename _II2, typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    bool
+    __lexicographical_compare_impl(_II1 __first1, _II1 __last1,
+				   _II2 __first2, _II2 __last2,
+				   _Compare __comp)
+    {
+      typedef typename iterator_traits<_II1>::iterator_category _Category1;
+      typedef typename iterator_traits<_II2>::iterator_category _Category2;
+      typedef std::__lc_rai<_Category1, _Category2> __rai_type;
+
+      __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
+      for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
+	   ++__first1, (void)++__first2)
+	{
+	  if (__comp(__first1, __first2))
+	    return true;
+	  if (__comp(__first2, __first1))
+	    return false;
+	}
+      return __first1 == __last1 && __first2 != __last2;
+    }
+
+  template<bool _BoolType>
+    struct __lexicographical_compare
+    {
+      template<typename _II1, typename _II2>
+	_GLIBCXX20_CONSTEXPR
+	static bool
+	__lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+	{
+	  using __gnu_cxx::__ops::__iter_less_iter;
+	  return std::__lexicographical_compare_impl(__first1, __last1,
+						     __first2, __last2,
+						     __iter_less_iter());
+	}
+
+      template<typename _II1, typename _II2>
+	_GLIBCXX20_CONSTEXPR
+	static int
+	__3way(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+	{
+	  while (__first1 != __last1)
+	    {
+	      if (__first2 == __last2)
+		return +1;
+	      if (*__first1 < *__first2)
+		return -1;
+	      if (*__first2 < *__first1)
+		return +1;
+	      ++__first1;
+	      ++__first2;
+	    }
+	  return int(__first2 == __last2) - 1;
+	}
+    };
+
+  template<>
+    struct __lexicographical_compare<true>
+    {
+      template<typename _Tp, typename _Up>
+	_GLIBCXX20_CONSTEXPR
+	static bool
+	__lc(const _Tp* __first1, const _Tp* __last1,
+	     const _Up* __first2, const _Up* __last2)
+	{ return __3way(__first1, __last1, __first2, __last2) < 0; }
+
+      template<typename _Tp, typename _Up>
+	_GLIBCXX20_CONSTEXPR
+	static ptrdiff_t
+	__3way(const _Tp* __first1, const _Tp* __last1,
+	       const _Up* __first2, const _Up* __last2)
+	{
+	  const size_t __len1 = __last1 - __first1;
+	  const size_t __len2 = __last2 - __first2;
+	  if (const size_t __len = std::min(__len1, __len2))
+	    if (int __result = std::__memcmp(__first1, __first2, __len))
+	      return __result;
+	  return ptrdiff_t(__len1 - __len2);
+	}
+    };
+
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __lexicographical_compare_aux1(_II1 __first1, _II1 __last1,
+				   _II2 __first2, _II2 __last2)
+    {
+      typedef typename iterator_traits<_II1>::value_type _ValueType1;
+      typedef typename iterator_traits<_II2>::value_type _ValueType2;
+      const bool __simple =
+	(__is_memcmp_ordered_with<_ValueType1, _ValueType2>::__value
+	 && __is_pointer<_II1>::__value
+	 && __is_pointer<_II2>::__value
+
+
+
+
+
+
+
+	 );
+
+      return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
+							    __first2, __last2);
+    }
+
+  template<typename _Tp1, typename _Ref1, typename _Ptr1,
+	   typename _Tp2>
+    bool
+    __lexicographical_compare_aux1(
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+	_Tp2*, _Tp2*);
+
+  template<typename _Tp1,
+	   typename _Tp2, typename _Ref2, typename _Ptr2>
+    bool
+    __lexicographical_compare_aux1(_Tp1*, _Tp1*,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>);
+
+  template<typename _Tp1, typename _Ref1, typename _Ptr1,
+	   typename _Tp2, typename _Ref2, typename _Ptr2>
+    bool
+    __lexicographical_compare_aux1(
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp1, _Ref1, _Ptr1>,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>,
+	_GLIBCXX_STD_C::_Deque_iterator<_Tp2, _Ref2, _Ptr2>);
+
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
+				  _II2 __first2, _II2 __last2)
+    {
+      return std::__lexicographical_compare_aux1(std::__niter_base(__first1),
+						 std::__niter_base(__last1),
+						 std::__niter_base(__first2),
+						 std::__niter_base(__last2));
+    }
+
+  template<typename _Iter1, typename _Seq1, typename _Cat1,
+	   typename _II2>
+    bool
+    __lexicographical_compare_aux(
+		const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+		_II2, _II2);
+
+  template<typename _II1,
+	   typename _Iter2, typename _Seq2, typename _Cat2>
+    bool
+    __lexicographical_compare_aux(
+		_II1, _II1,
+		const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&,
+		const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&);
+
+  template<typename _Iter1, typename _Seq1, typename _Cat1,
+	   typename _Iter2, typename _Seq2, typename _Cat2>
+    bool
+    __lexicographical_compare_aux(
+		const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_Iter1, _Seq1, _Cat1>&,
+		const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&,
+		const ::__gnu_debug::_Safe_iterator<_Iter2, _Seq2, _Cat2>&);
+
+  template<typename _ForwardIterator, typename _Tp, typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    _ForwardIterator
+    __lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+		  const _Tp& __val, _Compare __comp)
+    {
+      typedef typename iterator_traits<_ForwardIterator>::difference_type
+	_DistanceType;
+
+      _DistanceType __len = std::distance(__first, __last);
+
+      while (__len > 0)
+	{
+	  _DistanceType __half = __len >> 1;
+	  _ForwardIterator __middle = __first;
+	  std::advance(__middle, __half);
+	  if (__comp(__middle, __val))
+	    {
+	      __first = __middle;
+	      ++__first;
+	      __len = __len - __half - 1;
+	    }
+	  else
+	    __len = __half;
+	}
+      return __first;
+    }
+
+  /**
+   *  @brief Finds the first position in which @a val could be inserted
+   *         without changing the ordering.
+   *  @param  __first   An iterator.
+   *  @param  __last    Another iterator.
+   *  @param  __val     The search term.
+   *  @return         An iterator pointing to the first element <em>not less
+   *                  than</em> @a val, or end() if every element is less than
+   *                  @a val.
+   *  @ingroup binary_search_algorithms
+  */
+  template<typename _ForwardIterator, typename _Tp>
+    _GLIBCXX20_CONSTEXPR
+    inline _ForwardIterator
+    lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+		const _Tp& __val)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+      __glibcxx_function_requires(_LessThanOpConcept<
+	    typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+      __glibcxx_requires_partitioned_lower(__first, __last, __val);
+
+      return std::__lower_bound(__first, __last, __val,
+				__gnu_cxx::__ops::__iter_less_val());
+    }
+
+  /// This is a helper function for the sort routines and for random.tcc.
+  //  Precondition: __n > 0.
+  inline _GLIBCXX_CONSTEXPR int
+  __lg(int __n)
+  { return (int)sizeof(int) * __CHAR_BIT__  - 1 - __builtin_clz(__n); }
+
+  inline _GLIBCXX_CONSTEXPR unsigned
+  __lg(unsigned __n)
+  { return (int)sizeof(int) * __CHAR_BIT__  - 1 - __builtin_clz(__n); }
+
+  inline _GLIBCXX_CONSTEXPR long
+  __lg(long __n)
+  { return (int)sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
+
+  inline _GLIBCXX_CONSTEXPR unsigned long
+  __lg(unsigned long __n)
+  { return (int)sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
+
+  inline _GLIBCXX_CONSTEXPR long long
+  __lg(long long __n)
+  { return (int)sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
+
+  inline _GLIBCXX_CONSTEXPR unsigned long long
+  __lg(unsigned long long __n)
+  { return (int)sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
+
+_GLIBCXX_BEGIN_NAMESPACE_ALGO
+
+  /**
+   *  @brief Tests a range for element-wise equality.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @return   A boolean true or false.
+   *
+   *  This compares the elements of two ranges using @c == and returns true or
+   *  false depending on whether all of the corresponding elements of the
+   *  ranges are equal.
+  */
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    equal(_II1 __first1, _II1 __last1, _II2 __first2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_II2>)
+      __glibcxx_function_requires(_EqualOpConcept<
+	    typename iterator_traits<_II1>::value_type,
+	    typename iterator_traits<_II2>::value_type>)
+      __glibcxx_requires_can_increment_range(__first1, __last1, __first2);
+
+      return std::__equal_aux(__first1, __last1, __first2);
+    }
+
+  /**
+   *  @brief Tests a range for element-wise equality.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param __binary_pred A binary predicate @link functors
+   *                  functor@endlink.
+   *  @return         A boolean true or false.
+   *
+   *  This compares the elements of two ranges using the binary_pred
+   *  parameter, and returns true or
+   *  false depending on whether all of the corresponding elements of the
+   *  ranges are equal.
+  */
+  template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    equal(_IIter1 __first1, _IIter1 __last1,
+	  _IIter2 __first2, _BinaryPredicate __binary_pred)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+
+      for (; __first1 != __last1; ++__first1, (void)++__first2)
+	if (!bool(__binary_pred(*__first1, *__first2)))
+	  return false;
+      return true;
+    }
+
+
+  // 4-iterator version of std::equal<It1, It2> for use in C++11.
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+    {
+      using _RATag = random_access_iterator_tag;
+      using _Cat1 = typename iterator_traits<_II1>::iterator_category;
+      using _Cat2 = typename iterator_traits<_II2>::iterator_category;
+      using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
+      if (_RAIters())
+	{
+	  auto __d1 = std::distance(__first1, __last1);
+	  auto __d2 = std::distance(__first2, __last2);
+	  if (__d1 != __d2)
+	    return false;
+	  return _GLIBCXX_STD_A::equal(__first1, __last1, __first2);
+	}
+
+      for (; __first1 != __last1 && __first2 != __last2;
+	  ++__first1, (void)++__first2)
+	if (!(*__first1 == *__first2))
+	  return false;
+      return __first1 == __last1 && __first2 == __last2;
+    }
+
+  // 4-iterator version of std::equal<It1, It2, BinaryPred> for use in C++11.
+  template<typename _II1, typename _II2, typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2,
+	     _BinaryPredicate __binary_pred)
+    {
+      using _RATag = random_access_iterator_tag;
+      using _Cat1 = typename iterator_traits<_II1>::iterator_category;
+      using _Cat2 = typename iterator_traits<_II2>::iterator_category;
+      using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
+      if (_RAIters())
+	{
+	  auto __d1 = std::distance(__first1, __last1);
+	  auto __d2 = std::distance(__first2, __last2);
+	  if (__d1 != __d2)
+	    return false;
+	  return _GLIBCXX_STD_A::equal(__first1, __last1, __first2,
+				       __binary_pred);
+	}
+
+      for (; __first1 != __last1 && __first2 != __last2;
+	  ++__first1, (void)++__first2)
+	if (!bool(__binary_pred(*__first1, *__first2)))
+	  return false;
+      return __first1 == __last1 && __first2 == __last2;
+    }
+
+
+
+
+#define __cpp_lib_robust_nonmodifying_seq_ops 201304
+
+  /**
+   *  @brief Tests a range for element-wise equality.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @return   A boolean true or false.
+   *
+   *  This compares the elements of two ranges using @c == and returns true or
+   *  false depending on whether all of the corresponding elements of the
+   *  ranges are equal.
+  */
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    equal(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_II2>)
+      __glibcxx_function_requires(_EqualOpConcept<
+	    typename iterator_traits<_II1>::value_type,
+	    typename iterator_traits<_II2>::value_type>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return _GLIBCXX_STD_A::__equal4(__first1, __last1, __first2, __last2);
+    }
+
+  /**
+   *  @brief Tests a range for element-wise equality.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @param __binary_pred A binary predicate @link functors
+   *                  functor@endlink.
+   *  @return         A boolean true or false.
+   *
+   *  This compares the elements of two ranges using the binary_pred
+   *  parameter, and returns true or
+   *  false depending on whether all of the corresponding elements of the
+   *  ranges are equal.
+  */
+  template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    equal(_IIter1 __first1, _IIter1 __last1,
+	  _IIter2 __first2, _IIter2 __last2, _BinaryPredicate __binary_pred)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return _GLIBCXX_STD_A::__equal4(__first1, __last1, __first2, __last2,
+				      __binary_pred);
+    }
+
+
+  /**
+   *  @brief Performs @b dictionary comparison on ranges.
+   *  @ingroup sorting_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @return   A boolean true or false.
+   *
+   *  <em>Returns true if the sequence of elements defined by the range
+   *  [first1,last1) is lexicographically less than the sequence of elements
+   *  defined by the range [first2,last2).  Returns false otherwise.</em>
+   *  (Quoted from [25.3.8]/1.)  If the iterators are all character pointers,
+   *  then this is an inline call to @c memcmp.
+  */
+  template<typename _II1, typename _II2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    lexicographical_compare(_II1 __first1, _II1 __last1,
+			    _II2 __first2, _II2 __last2)
+    {
+
+
+
+
+
+      __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_II2>)
+      __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+      __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return std::__lexicographical_compare_aux(__first1, __last1,
+						__first2, __last2);
+    }
+
+  /**
+   *  @brief Performs @b dictionary comparison on ranges.
+   *  @ingroup sorting_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @param  __comp  A @link comparison_functors comparison functor@endlink.
+   *  @return   A boolean true or false.
+   *
+   *  The same as the four-parameter @c lexicographical_compare, but uses the
+   *  comp parameter instead of @c <.
+  */
+  template<typename _II1, typename _II2, typename _Compare>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    lexicographical_compare(_II1 __first1, _II1 __last1,
+			    _II2 __first2, _II2 __last2, _Compare __comp)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_II2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return std::__lexicographical_compare_impl
+	(__first1, __last1, __first2, __last2,
+	 __gnu_cxx::__ops::__iter_comp_iter(__comp));
+    }
+
+
+  template<typename _InputIterator1, typename _InputIterator2,
+	   typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    pair<_InputIterator1, _InputIterator2>
+    __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	       _InputIterator2 __first2, _BinaryPredicate __binary_pred)
+    {
+      while (__first1 != __last1 && __binary_pred(__first1, __first2))
+	{
+	  ++__first1;
+	  ++__first2;
+	}
+      return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+    }
+
+  /**
+   *  @brief Finds the places in ranges which don't match.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @return   A pair of iterators pointing to the first mismatch.
+   *
+   *  This compares the elements of two ranges using @c == and returns a pair
+   *  of iterators.  The first iterator points into the first range, the
+   *  second iterator points into the second range, and the elements pointed
+   *  to by the iterators are not equal.
+  */
+  template<typename _InputIterator1, typename _InputIterator2>
+    _GLIBCXX20_CONSTEXPR
+    inline pair<_InputIterator1, _InputIterator2>
+    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	     _InputIterator2 __first2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+      __glibcxx_function_requires(_EqualOpConcept<
+	    typename iterator_traits<_InputIterator1>::value_type,
+	    typename iterator_traits<_InputIterator2>::value_type>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+
+      return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
+			     __gnu_cxx::__ops::__iter_equal_to_iter());
+    }
+
+  /**
+   *  @brief Finds the places in ranges which don't match.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param __binary_pred A binary predicate @link functors
+   *         functor@endlink.
+   *  @return   A pair of iterators pointing to the first mismatch.
+   *
+   *  This compares the elements of two ranges using the binary_pred
+   *  parameter, and returns a pair
+   *  of iterators.  The first iterator points into the first range, the
+   *  second iterator points into the second range, and the elements pointed
+   *  to by the iterators are not equal.
+  */
+  template<typename _InputIterator1, typename _InputIterator2,
+	   typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    inline pair<_InputIterator1, _InputIterator2>
+    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	     _InputIterator2 __first2, _BinaryPredicate __binary_pred)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+
+      return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
+	__gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
+    }
+
+
+
+  template<typename _InputIterator1, typename _InputIterator2,
+	   typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    pair<_InputIterator1, _InputIterator2>
+    __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	       _InputIterator2 __first2, _InputIterator2 __last2,
+	       _BinaryPredicate __binary_pred)
+    {
+      while (__first1 != __last1 && __first2 != __last2
+	     && __binary_pred(__first1, __first2))
+	{
+	  ++__first1;
+	  ++__first2;
+	}
+      return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+    }
+
+  /**
+   *  @brief Finds the places in ranges which don't match.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @return   A pair of iterators pointing to the first mismatch.
+   *
+   *  This compares the elements of two ranges using @c == and returns a pair
+   *  of iterators.  The first iterator points into the first range, the
+   *  second iterator points into the second range, and the elements pointed
+   *  to by the iterators are not equal.
+  */
+  template<typename _InputIterator1, typename _InputIterator2>
+    _GLIBCXX20_CONSTEXPR
+    inline pair<_InputIterator1, _InputIterator2>
+    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	     _InputIterator2 __first2, _InputIterator2 __last2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+      __glibcxx_function_requires(_EqualOpConcept<
+	    typename iterator_traits<_InputIterator1>::value_type,
+	    typename iterator_traits<_InputIterator2>::value_type>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
+			     __gnu_cxx::__ops::__iter_equal_to_iter());
+    }
+
+  /**
+   *  @brief Finds the places in ranges which don't match.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  An input iterator.
+   *  @param  __last1   An input iterator.
+   *  @param  __first2  An input iterator.
+   *  @param  __last2   An input iterator.
+   *  @param __binary_pred A binary predicate @link functors
+   *         functor@endlink.
+   *  @return   A pair of iterators pointing to the first mismatch.
+   *
+   *  This compares the elements of two ranges using the binary_pred
+   *  parameter, and returns a pair
+   *  of iterators.  The first iterator points into the first range, the
+   *  second iterator points into the second range, and the elements pointed
+   *  to by the iterators are not equal.
+  */
+  template<typename _InputIterator1, typename _InputIterator2,
+	   typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    inline pair<_InputIterator1, _InputIterator2>
+    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+	     _InputIterator2 __first2, _InputIterator2 __last2,
+	     _BinaryPredicate __binary_pred)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+      __glibcxx_requires_valid_range(__first2, __last2);
+
+      return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
+			     __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
+    }
+
+
+_GLIBCXX_END_NAMESPACE_ALGO
+
+  /// This is an overload used by find algos for the Input Iterator case.
+  template<typename _InputIterator, typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    inline _InputIterator
+    __find_if(_InputIterator __first, _InputIterator __last,
+	      _Predicate __pred, input_iterator_tag)
+    {
+      while (__first != __last && !__pred(__first))
+	++__first;
+      return __first;
+    }
+
+  /// This is an overload used by find algos for the RAI case.
+  template<typename _RandomAccessIterator, typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    _RandomAccessIterator
+    __find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
+	      _Predicate __pred, random_access_iterator_tag)
+    {
+      typename iterator_traits<_RandomAccessIterator>::difference_type
+	__trip_count = (__last - __first) >> 2;
+
+      for (; __trip_count > 0; --__trip_count)
+	{
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+	}
+
+      switch (__last - __first)
+	{
+	case 3:
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+	  // FALLTHRU
+	case 2:
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+	  // FALLTHRU
+	case 1:
+	  if (__pred(__first))
+	    return __first;
+	  ++__first;
+	  // FALLTHRU
+	case 0:
+	default:
+	  return __last;
+	}
+    }
+
+  template<typename _Iterator, typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    inline _Iterator
+    __find_if(_Iterator __first, _Iterator __last, _Predicate __pred)
+    {
+      return __find_if(__first, __last, __pred,
+		       std::__iterator_category(__first));
+    }
+
+  template<typename _InputIterator, typename _Predicate>
+    _GLIBCXX20_CONSTEXPR
+    typename iterator_traits<_InputIterator>::difference_type
+    __count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
+    {
+      typename iterator_traits<_InputIterator>::difference_type __n = 0;
+      for (; __first != __last; ++__first)
+	if (__pred(__first))
+	  ++__n;
+      return __n;
+    }
+
+
+  template<typename _ForwardIterator1, typename _ForwardIterator2,
+	   typename _BinaryPredicate>
+    _GLIBCXX20_CONSTEXPR
+    bool
+    __is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+		     _ForwardIterator2 __first2, _BinaryPredicate __pred)
+    {
+      // Efficiently compare identical prefixes:  O(N) if sequences
+      // have the same elements in the same order.
+      for (; __first1 != __last1; ++__first1, (void)++__first2)
+	if (!__pred(__first1, __first2))
+	  break;
+
+      if (__first1 == __last1)
+	return true;
+
+      // Establish __last2 assuming equal ranges by iterating over the
+      // rest of the list.
+      _ForwardIterator2 __last2 = __first2;
+      std::advance(__last2, std::distance(__first1, __last1));
+      for (_ForwardIterator1 __scan = __first1; __scan != __last1; ++__scan)
+	{
+	  if (__scan != std::__find_if(__first1, __scan,
+			  __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan)))
+	    continue; // We've seen this one before.
+
+	  auto __matches
+	    = std::__count_if(__first2, __last2,
+			__gnu_cxx::__ops::__iter_comp_iter(__pred, __scan));
+	  if (0 == __matches ||
+	      std::__count_if(__scan, __last1,
+			__gnu_cxx::__ops::__iter_comp_iter(__pred, __scan))
+	      != __matches)
+	    return false;
+	}
+      return true;
+    }
+
+  /**
+   *  @brief  Checks whether a permutation of the second sequence is equal
+   *          to the first sequence.
+   *  @ingroup non_mutating_algorithms
+   *  @param  __first1  Start of first range.
+   *  @param  __last1   End of first range.
+   *  @param  __first2  Start of second range.
+   *  @return true if there exists a permutation of the elements in the range
+   *          [__first2, __first2 + (__last1 - __first1)), beginning with
+   *          ForwardIterator2 begin, such that equal(__first1, __last1, begin)
+   *          returns true; otherwise, returns false.
+  */
+  template<typename _ForwardIterator1, typename _ForwardIterator2>
+    _GLIBCXX20_CONSTEXPR
+    inline bool
+    is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+		   _ForwardIterator2 __first2)
+    {
+      // concept requirements
+      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+      __glibcxx_function_requires(_EqualOpConcept<
+		typename iterator_traits<_ForwardIterator1>::value_type,
+		typename iterator_traits<_ForwardIterator2>::value_type>)
+      __glibcxx_requires_valid_range(__first1, __last1);
+
+      return std::__is_permutation(__first1, __last1, __first2,
+				   __gnu_cxx::__ops::__iter_equal_to_iter());
+    }
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+// NB: This file is included within many other C++ includes, as a way
+// of getting the base algorithms. So, make sure that parallel bits
+// come in too if requested.
+
+
+
+
+
+// -*- C++ -*- forwarding header.
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/cwchar
+ *  This is a Standard C++ Library file.  You should @c \#include this file
+ *  in your programs, rather than any of the @a *.h implementation files.
+ *
+ *  This is the C++ version of the Standard C Library header @c wchar.h,
+ *  and its contents are (mostly) the same as that header, but are all
+ *  contained in the namespace @c std (except for names which are defined
+ *  as macros in C).
+ */
+
+//
+// ISO C++ 14882: 21.4
+//
+
+       
+
+
+
+
+
+
+
+
+
+
+
+
+#define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__))
+
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   *  @brief  Mapping from character type to associated types.
+   *
+   *  @note This is an implementation class for the generic version
+   *  of char_traits.  It defines int_type, off_type, pos_type, and
+   *  state_type.  By default these are unsigned long, streamoff,
+   *  streampos, and mbstate_t.  Users who need a different set of
+   *  types, but who don't need to change the definitions of any function
+   *  defined in char_traits, can specialize __gnu_cxx::_Char_types
+   *  while leaving __gnu_cxx::char_traits alone. */
+  template<typename _CharT>
+    struct _Char_types
+    {
+      typedef unsigned long   int_type;
+      typedef std::streampos  pos_type;
+      typedef std::streamoff  off_type;
+      typedef std::mbstate_t  state_type;
+    };
+
+
+  /**
+   *  @brief  Base class used to implement std::char_traits.
+   *
+   *  @note For any given actual character type, this definition is
+   *  probably wrong.  (Most of the member functions are likely to be
+   *  right, but the int_type and state_type typedefs, and the eof()
+   *  member function, are likely to be wrong.)  The reason this class
+   *  exists is so users can specialize it.  Classes in namespace std
+   *  may not be specialized for fundamental types, but classes in
+   *  namespace __gnu_cxx may be.
+   *
+   *  See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types
+   *  for advice on how to make use of this class for @a unusual character
+   *  types. Also, check out include/ext/pod_char_traits.h.  
+   */
+  template<typename _CharT>
+    struct char_traits
+    {
+      typedef _CharT                                    char_type;
+      typedef typename _Char_types<_CharT>::int_type    int_type;
+      typedef typename _Char_types<_CharT>::pos_type    pos_type;
+      typedef typename _Char_types<_CharT>::off_type    off_type;
+      typedef typename _Char_types<_CharT>::state_type  state_type;
+
+
+
+
+      static _GLIBCXX14_CONSTEXPR void
+      assign(char_type& __c1, const char_type& __c2)
+      { __c1 = __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq(const char_type& __c1, const char_type& __c2)
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      lt(const char_type& __c1, const char_type& __c2)
+      { return __c1 < __c2; }
+
+      static _GLIBCXX14_CONSTEXPR int
+      compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
+
+      static _GLIBCXX14_CONSTEXPR std::size_t
+      length(const char_type* __s);
+
+      static _GLIBCXX14_CONSTEXPR const char_type*
+      find(const char_type* __s, std::size_t __n, const char_type& __a);
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      move(char_type* __s1, const char_type* __s2, std::size_t __n);
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      copy(char_type* __s1, const char_type* __s2, std::size_t __n);
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      assign(char_type* __s, std::size_t __n, char_type __a);
+
+      static _GLIBCXX_CONSTEXPR char_type
+      to_char_type(const int_type& __c)
+      { return static_cast<char_type>(__c); }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      to_int_type(const char_type& __c)
+      { return static_cast<int_type>(__c); }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq_int_type(const int_type& __c1, const int_type& __c2)
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      eof()
+      { return static_cast<int_type>(_GLIBCXX_STDIO_EOF); }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      not_eof(const int_type& __c)
+      { return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
+    };
+
+  template<typename _CharT>
+    _GLIBCXX14_CONSTEXPR int
+    char_traits<_CharT>::
+    compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
+    {
+      for (std::size_t __i = 0; __i < __n; ++__i)
+	if (lt(__s1[__i], __s2[__i]))
+	  return -1;
+	else if (lt(__s2[__i], __s1[__i]))
+	  return 1;
+      return 0;
+    }
+
+  template<typename _CharT>
+    _GLIBCXX14_CONSTEXPR std::size_t
+    char_traits<_CharT>::
+    length(const char_type* __p)
+    {
+      std::size_t __i = 0;
+      while (!eq(__p[__i], char_type()))
+        ++__i;
+      return __i;
+    }
+
+  template<typename _CharT>
+    _GLIBCXX14_CONSTEXPR const typename char_traits<_CharT>::char_type*
+    char_traits<_CharT>::
+    find(const char_type* __s, std::size_t __n, const char_type& __a)
+    {
+      for (std::size_t __i = 0; __i < __n; ++__i)
+        if (eq(__s[__i], __a))
+          return __s + __i;
+      return 0;
+    }
+
+  template<typename _CharT>
+    _GLIBCXX20_CONSTEXPR
+    typename char_traits<_CharT>::char_type*
+    char_traits<_CharT>::
+    move(char_type* __s1, const char_type* __s2, std::size_t __n)
+    {
+      if (__n == 0)
+	return __s1;
+      return static_cast<_CharT*>(__builtin_memmove(__s1, __s2,
+						    __n * sizeof(char_type)));
+    }
+
+  template<typename _CharT>
+    _GLIBCXX20_CONSTEXPR
+    typename char_traits<_CharT>::char_type*
+    char_traits<_CharT>::
+    copy(char_type* __s1, const char_type* __s2, std::size_t __n)
+    {
+      // NB: Inline std::copy so no recursive dependencies.
+      std::copy(__s2, __s2 + __n, __s1);
+      return __s1;
+    }
+
+  template<typename _CharT>
+    _GLIBCXX20_CONSTEXPR
+    typename char_traits<_CharT>::char_type*
+    char_traits<_CharT>::
+    assign(char_type* __s, std::size_t __n, char_type __a)
+    {
+      // NB: Inline std::fill_n so no recursive dependencies.
+      std::fill_n(__s, __n, __a);
+      return __s;
+    }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+
+
+
+// Unofficial macro indicating P0426R1 support
+#define __cpp_lib_constexpr_char_traits 201611L
+
+
+
+
+
+  /**
+   *  @brief Determine whether the characters of a NULL-terminated
+   *  string are known at compile time.
+   *  @param  __s  The string.
+   *
+   *  Assumes that _CharT is a built-in character type.
+   */
+  template<typename _CharT>
+    static _GLIBCXX_ALWAYS_INLINE constexpr bool
+    __constant_string_p(const _CharT* __s)
+    {
+
+      (void) __s;
+      // In constexpr contexts all strings should be constant.
+      return __builtin_is_constant_evaluated();
+
+
+
+
+
+    }
+
+  /**
+   *  @brief Determine whether the characters of a character array are
+   *  known at compile time.
+   *  @param  __a  The character array.
+   *  @param  __n  Number of characters.
+   *
+   *  Assumes that _CharT is a built-in character type.
+   */
+  template<typename _CharT>
+    static _GLIBCXX_ALWAYS_INLINE constexpr bool
+    __constant_char_array_p(const _CharT* __a, size_t __n)
+    {
+
+      (void) __a;
+      (void) __n;
+      // In constexpr contexts all character arrays should be constant.
+      return __builtin_is_constant_evaluated();
+
+
+
+
+
+
+    }
+
+
+  // 21.1
+  /**
+   *  @brief  Basis for explicit traits specializations.
+   *
+   *  @note  For any given actual character type, this definition is
+   *  probably wrong.  Since this is just a thin wrapper around
+   *  __gnu_cxx::char_traits, it is possible to achieve a more
+   *  appropriate definition by specializing __gnu_cxx::char_traits.
+   *
+   *  See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types
+   *  for advice on how to make use of this class for @a unusual character
+   *  types. Also, check out include/ext/pod_char_traits.h.
+  */
+  template<class _CharT>
+    struct char_traits : public __gnu_cxx::char_traits<_CharT>
+    { };
+
+
+  /// 21.1.3.1  char_traits specializations
+  template<>
+    struct char_traits<char>
+    {
+      typedef char              char_type;
+      typedef int               int_type;
+      typedef streampos         pos_type;
+      typedef streamoff         off_type;
+      typedef mbstate_t         state_type;
+
+
+
+
+      static _GLIBCXX17_CONSTEXPR void
+      assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      { __c1 = __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      {
+	// LWG 467.
+	return (static_cast<unsigned char>(__c1)
+		< static_cast<unsigned char>(__c2));
+      }
+
+      static _GLIBCXX17_CONSTEXPR int
+      compare(const char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return 0;
+
+	if (__builtin_constant_p(__n)
+	    && __constant_char_array_p(__s1, __n)
+	    && __constant_char_array_p(__s2, __n))
+	  return __gnu_cxx::char_traits<char_type>::compare(__s1, __s2, __n);
+
+	return __builtin_memcmp(__s1, __s2, __n);
+      }
+
+      static _GLIBCXX17_CONSTEXPR size_t
+      length(const char_type* __s)
+      {
+
+	if (__constant_string_p(__s))
+	  return __gnu_cxx::char_traits<char_type>::length(__s);
+
+	return __builtin_strlen(__s);
+      }
+
+      static _GLIBCXX17_CONSTEXPR const char_type*
+      find(const char_type* __s, size_t __n, const char_type& __a)
+      {
+	if (__n == 0)
+	  return 0;
+
+	if (__builtin_constant_p(__n)
+	    && __builtin_constant_p(__a)
+	    && __constant_char_array_p(__s, __n))
+	  return __gnu_cxx::char_traits<char_type>::find(__s, __n, __a);
+
+	return static_cast<const char_type*>(__builtin_memchr(__s, __a, __n));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      move(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return static_cast<char_type*>(__builtin_memmove(__s1, __s2, __n));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      copy(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return static_cast<char_type*>(__builtin_memcpy(__s1, __s2, __n));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      assign(char_type* __s, size_t __n, char_type __a)
+      {
+	if (__n == 0)
+	  return __s;
+
+
+
+
+	return static_cast<char_type*>(__builtin_memset(__s, __a, __n));
+      }
+
+      static _GLIBCXX_CONSTEXPR char_type
+      to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT
+      { return static_cast<char_type>(__c); }
+
+      // To keep both the byte 0xff and the eof symbol 0xffffffff
+      // from ending up as 0xffffffff.
+      static _GLIBCXX_CONSTEXPR int_type
+      to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT
+      { return static_cast<int_type>(static_cast<unsigned char>(__c)); }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      eof() _GLIBCXX_NOEXCEPT
+      { return static_cast<int_type>(_GLIBCXX_STDIO_EOF); }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT
+      { return (__c == eof()) ? 0 : __c; }
+  };
+
+
+
+  /// 21.1.3.2  char_traits specializations
+  template<>
+    struct char_traits<wchar_t>
+    {
+      typedef wchar_t           char_type;
+      typedef wint_t            int_type;
+      typedef streamoff         off_type;
+      typedef wstreampos        pos_type;
+      typedef mbstate_t         state_type;
+
+
+
+
+      static _GLIBCXX17_CONSTEXPR void
+      assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      { __c1 = __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR bool
+      lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT
+      { return __c1 < __c2; }
+
+      static _GLIBCXX17_CONSTEXPR int
+      compare(const char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return 0;
+
+	if (__builtin_constant_p(__n)
+	    && __constant_char_array_p(__s1, __n)
+	    && __constant_char_array_p(__s2, __n))
+	  return __gnu_cxx::char_traits<char_type>::compare(__s1, __s2, __n);
+
+	return wmemcmp(__s1, __s2, __n);
+      }
+
+      static _GLIBCXX17_CONSTEXPR size_t
+      length(const char_type* __s)
+      {
+
+	if (__constant_string_p(__s))
+	  return __gnu_cxx::char_traits<char_type>::length(__s);
+
+	return wcslen(__s);
+      }
+
+      static _GLIBCXX17_CONSTEXPR const char_type*
+      find(const char_type* __s, size_t __n, const char_type& __a)
+      {
+	if (__n == 0)
+	  return 0;
+
+	if (__builtin_constant_p(__n)
+	    && __builtin_constant_p(__a)
+	    && __constant_char_array_p(__s, __n))
+	  return __gnu_cxx::char_traits<char_type>::find(__s, __n, __a);
+
+	return wmemchr(__s, __a, __n);
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      move(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return wmemmove(__s1, __s2, __n);
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      copy(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return wmemcpy(__s1, __s2, __n);
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      assign(char_type* __s, size_t __n, char_type __a)
+      {
+	if (__n == 0)
+	  return __s;
+
+
+
+
+	return wmemset(__s, __a, __n);
+      }
+
+      static _GLIBCXX_CONSTEXPR char_type
+      to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT
+      { return char_type(__c); }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT
+      { return int_type(__c); }
+
+      static _GLIBCXX_CONSTEXPR bool
+      eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT
+      { return __c1 == __c2; }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      eof() _GLIBCXX_NOEXCEPT
+      { return static_cast<int_type>(WEOF); }
+
+      static _GLIBCXX_CONSTEXPR int_type
+      not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT
+      { return eq_int_type(__c, eof()) ? 0 : __c; }
+  };
+
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+
+// <cstdint> -*- C++ -*-
+
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/cstdint
+ *  This is a Standard C++ Library header.
+ */
+
+
+#define _GLIBCXX_CSTDINT 1
+
+       
+
+
+
+
+
+
+
+
+
+
+
+#undef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 
+#undef __STDC_CONSTANT_MACROS
+#define __STDC_CONSTANT_MACROS 
+
+/* Copyright (C) 1997-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ *	ISO C99: 7.18 Integer types <stdint.h>
+ */
+
+
+#define _STDINT_H 1
+
+#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION 
+/* Handle feature test macros at the start of a header.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header is internal to glibc and should not be included outside
+   of glibc headers.  Headers including it must define
+   __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first.  This header
+   cannot have multiple include guards because ISO C feature test
+   macros depend on the definition of the macro when an affected
+   header is included, not when the first system header is
+   included.  */
+
+
+
+
+
+#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+
+
+
+/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
+   macro.  */
+#undef __GLIBC_USE_LIB_EXT2
+
+
+#define __GLIBC_USE_LIB_EXT2 1
+
+
+
+
+/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
+   macro.  */
+#undef __GLIBC_USE_IEC_60559_BFP_EXT
+
+#define __GLIBC_USE_IEC_60559_BFP_EXT 1
+
+
+
+
+/* ISO/IEC TS 18661-4:2015 defines the
+   __STDC_WANT_IEC_60559_FUNCS_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
+
+#define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
+
+
+
+
+/* ISO/IEC TS 18661-3:2015 defines the
+   __STDC_WANT_IEC_60559_TYPES_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_TYPES_EXT
+
+#define __GLIBC_USE_IEC_60559_TYPES_EXT 1
+/* bits/types.h -- definitions of __*_t types underlying *_t types.
+   Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ * Never include this file directly; use <sys/types.h> instead.
+ */
+
+
+#define _BITS_TYPES_H 1
+
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+
+/* Convenience types.  */
+typedef unsigned char __u_char;
+typedef unsigned short int __u_short;
+typedef unsigned int __u_int;
+typedef unsigned long int __u_long;
+
+/* Fixed-size types, underlying types depend on word size and compiler.  */
+typedef signed char __int8_t;
+typedef unsigned char __uint8_t;
+typedef signed short int __int16_t;
+typedef unsigned short int __uint16_t;
+typedef signed int __int32_t;
+typedef unsigned int __uint32_t;
+
+typedef signed long int __int64_t;
+typedef unsigned long int __uint64_t;
+
+
+
+
+
+/* Smallest types with at least a given width.  */
+typedef __int8_t __int_least8_t;
+typedef __uint8_t __uint_least8_t;
+typedef __int16_t __int_least16_t;
+typedef __uint16_t __uint_least16_t;
+typedef __int32_t __int_least32_t;
+typedef __uint32_t __uint_least32_t;
+typedef __int64_t __int_least64_t;
+typedef __uint64_t __uint_least64_t;
+
+/* quad_t is also 64 bits.  */
+
+typedef long int __quad_t;
+typedef unsigned long int __u_quad_t;
+
+
+
+
+
+/* Largest integral types.  */
+
+typedef long int __intmax_t;
+typedef unsigned long int __uintmax_t;
+
+
+
+
+
+
+/* The machine-dependent file <bits/typesizes.h> defines __*_T_TYPE
+   macros for each of the OS types we define below.  The definitions
+   of those macros must use the following macros for underlying types.
+   We define __S<SIZE>_TYPE and __U<SIZE>_TYPE for the signed and unsigned
+   variants of each of the following integer types on this machine.
+
+	16		-- "natural" 16-bit type (always short)
+	32		-- "natural" 32-bit type (always int)
+	64		-- "natural" 64-bit type (long or long long)
+	LONG32		-- 32-bit type, traditionally long
+	QUAD		-- 64-bit type, traditionally long long
+	WORD		-- natural type of __WORDSIZE bits (int or long)
+	LONGWORD	-- type of __WORDSIZE bits, traditionally long
+
+   We distinguish WORD/LONGWORD, 32/LONG32, and 64/QUAD so that the
+   conventional uses of `long' or `long long' type modifiers match the
+   types we define, even when a less-adorned type would be the same size.
+   This matters for (somewhat) portably writing printf/scanf formats for
+   these types, where using the appropriate l or ll format modifiers can
+   make the typedefs and the formats match up across all GNU platforms.  If
+   we used `long' when it's 64 bits where `long long' is expected, then the
+   compiler would warn about the formats not matching the argument types,
+   and the programmer changing them to shut up the compiler would break the
+   program's portability.
+
+   Here we assume what is presently the case in all the GCC configurations
+   we support: long long is always 64 bits, long is always word/address size,
+   and int is always 32 bits.  */
+
+#define __S16_TYPE short int
+#define __U16_TYPE unsigned short int
+#define __S32_TYPE int
+#define __U32_TYPE unsigned int
+#define __SLONGWORD_TYPE long int
+#define __ULONGWORD_TYPE unsigned long int
+#define __SQUAD_TYPE long int
+#define __UQUAD_TYPE unsigned long int
+#define __SWORD_TYPE long int
+#define __UWORD_TYPE unsigned long int
+#define __SLONG32_TYPE int
+#define __ULONG32_TYPE unsigned int
+#define __S64_TYPE long int
+#define __U64_TYPE unsigned long int
+/* No need to mark the typedef with __extension__.   */
+#define __STD_TYPE typedef
+
+
+
+/* bits/typesizes.h -- underlying types for *_t.  Linux/x86-64 version.
+   Copyright (C) 2012-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+
+
+
+
+#define _BITS_TYPESIZES_H 1
+
+/* See <bits/types.h> for the meaning of these macros.  This file exists so
+   that <bits/types.h> need not vary across different GNU platforms.  */
+
+/* X32 kernel interface is 64-bit.  */
+
+
+
+
+#define __SYSCALL_SLONG_TYPE __SLONGWORD_TYPE
+#define __SYSCALL_ULONG_TYPE __ULONGWORD_TYPE
+
+
+#define __DEV_T_TYPE __UQUAD_TYPE
+#define __UID_T_TYPE __U32_TYPE
+#define __GID_T_TYPE __U32_TYPE
+#define __INO_T_TYPE __SYSCALL_ULONG_TYPE
+#define __INO64_T_TYPE __UQUAD_TYPE
+#define __MODE_T_TYPE __U32_TYPE
+
+#define __NLINK_T_TYPE __SYSCALL_ULONG_TYPE
+#define __FSWORD_T_TYPE __SYSCALL_SLONG_TYPE
+
+
+
+
+#define __OFF_T_TYPE __SYSCALL_SLONG_TYPE
+#define __OFF64_T_TYPE __SQUAD_TYPE
+#define __PID_T_TYPE __S32_TYPE
+#define __RLIM_T_TYPE __SYSCALL_ULONG_TYPE
+#define __RLIM64_T_TYPE __UQUAD_TYPE
+#define __BLKCNT_T_TYPE __SYSCALL_SLONG_TYPE
+#define __BLKCNT64_T_TYPE __SQUAD_TYPE
+#define __FSBLKCNT_T_TYPE __SYSCALL_ULONG_TYPE
+#define __FSBLKCNT64_T_TYPE __UQUAD_TYPE
+#define __FSFILCNT_T_TYPE __SYSCALL_ULONG_TYPE
+#define __FSFILCNT64_T_TYPE __UQUAD_TYPE
+#define __ID_T_TYPE __U32_TYPE
+#define __CLOCK_T_TYPE __SYSCALL_SLONG_TYPE
+#define __TIME_T_TYPE __SYSCALL_SLONG_TYPE
+#define __USECONDS_T_TYPE __U32_TYPE
+#define __SUSECONDS_T_TYPE __SYSCALL_SLONG_TYPE
+#define __DADDR_T_TYPE __S32_TYPE
+#define __KEY_T_TYPE __S32_TYPE
+#define __CLOCKID_T_TYPE __S32_TYPE
+#define __TIMER_T_TYPE void *
+#define __BLKSIZE_T_TYPE __SYSCALL_SLONG_TYPE
+#define __FSID_T_TYPE struct { int __val[2]; }
+#define __SSIZE_T_TYPE __SWORD_TYPE
+#define __CPU_MASK_TYPE __SYSCALL_ULONG_TYPE
+
+
+/* Tell the libc code that off_t and off64_t are actually the same type
+   for all ABI purposes, even if possibly expressed as different base types
+   for C type-checking purposes.  */
+#define __OFF_T_MATCHES_OFF64_T 1
+
+/* Same for ino_t and ino64_t.  */
+#define __INO_T_MATCHES_INO64_T 1
+
+/* And for __rlim_t and __rlim64_t.  */
+#define __RLIM_T_MATCHES_RLIM64_T 1
+
+
+
+
+/* Number of descriptors that can fit in an `fd_set'.  */
+#define __FD_SETSIZE 1024
+
+
+
+
+__STD_TYPE __DEV_T_TYPE __dev_t;	/* Type of device numbers.  */
+__STD_TYPE __UID_T_TYPE __uid_t;	/* Type of user identifications.  */
+__STD_TYPE __GID_T_TYPE __gid_t;	/* Type of group identifications.  */
+__STD_TYPE __INO_T_TYPE __ino_t;	/* Type of file serial numbers.  */
+__STD_TYPE __INO64_T_TYPE __ino64_t;	/* Type of file serial numbers (LFS).*/
+__STD_TYPE __MODE_T_TYPE __mode_t;	/* Type of file attribute bitmasks.  */
+__STD_TYPE __NLINK_T_TYPE __nlink_t;	/* Type of file link counts.  */
+__STD_TYPE __OFF_T_TYPE __off_t;	/* Type of file sizes and offsets.  */
+__STD_TYPE __OFF64_T_TYPE __off64_t;	/* Type of file sizes and offsets (LFS).  */
+__STD_TYPE __PID_T_TYPE __pid_t;	/* Type of process identifications.  */
+__STD_TYPE __FSID_T_TYPE __fsid_t;	/* Type of file system IDs.  */
+__STD_TYPE __CLOCK_T_TYPE __clock_t;	/* Type of CPU usage counts.  */
+__STD_TYPE __RLIM_T_TYPE __rlim_t;	/* Type for resource measurement.  */
+__STD_TYPE __RLIM64_T_TYPE __rlim64_t;	/* Type for resource measurement (LFS).  */
+__STD_TYPE __ID_T_TYPE __id_t;		/* General type for IDs.  */
+__STD_TYPE __TIME_T_TYPE __time_t;	/* Seconds since the Epoch.  */
+__STD_TYPE __USECONDS_T_TYPE __useconds_t; /* Count of microseconds.  */
+__STD_TYPE __SUSECONDS_T_TYPE __suseconds_t; /* Signed count of microseconds.  */
+
+__STD_TYPE __DADDR_T_TYPE __daddr_t;	/* The type of a disk address.  */
+__STD_TYPE __KEY_T_TYPE __key_t;	/* Type of an IPC key.  */
+
+/* Clock ID used in clock and timer functions.  */
+__STD_TYPE __CLOCKID_T_TYPE __clockid_t;
+
+/* Timer ID returned by `timer_create'.  */
+__STD_TYPE __TIMER_T_TYPE __timer_t;
+
+/* Type to represent block size.  */
+__STD_TYPE __BLKSIZE_T_TYPE __blksize_t;
+
+/* Types from the Large File Support interface.  */
+
+/* Type to count number of disk blocks.  */
+__STD_TYPE __BLKCNT_T_TYPE __blkcnt_t;
+__STD_TYPE __BLKCNT64_T_TYPE __blkcnt64_t;
+
+/* Type to count file system blocks.  */
+__STD_TYPE __FSBLKCNT_T_TYPE __fsblkcnt_t;
+__STD_TYPE __FSBLKCNT64_T_TYPE __fsblkcnt64_t;
+
+/* Type to count file system nodes.  */
+__STD_TYPE __FSFILCNT_T_TYPE __fsfilcnt_t;
+__STD_TYPE __FSFILCNT64_T_TYPE __fsfilcnt64_t;
+
+/* Type of miscellaneous file system fields.  */
+__STD_TYPE __FSWORD_T_TYPE __fsword_t;
+
+__STD_TYPE __SSIZE_T_TYPE __ssize_t; /* Type of a byte count, or error.  */
+
+/* Signed long type used in system calls.  */
+__STD_TYPE __SYSCALL_SLONG_TYPE __syscall_slong_t;
+/* Unsigned long type used in system calls.  */
+__STD_TYPE __SYSCALL_ULONG_TYPE __syscall_ulong_t;
+
+/* These few don't really vary by system, they always correspond
+   to one of the other defined types.  */
+typedef __off64_t __loff_t;	/* Type of file sizes and offsets (LFS).  */
+typedef char *__caddr_t;
+
+/* Duplicates info from stdint.h but this is used in unistd.h.  */
+__STD_TYPE __SWORD_TYPE __intptr_t;
+
+/* Duplicate info from sys/socket.h.  */
+__STD_TYPE __U32_TYPE __socklen_t;
+
+/* C99: An integer type that can be accessed as an atomic entity,
+   even in the presence of asynchronous interrupts.
+   It is not currently necessary for this to be machine-specific.  */
+typedef int __sig_atomic_t;
+
+#undef __STD_TYPE
+
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+
+/* Exact integral types.  */
+
+/* Signed.  */
+/* Define intN_t types.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_STDINT_INTN_H 1
+
+
+
+typedef __int8_t int8_t;
+typedef __int16_t int16_t;
+typedef __int32_t int32_t;
+typedef __int64_t int64_t;
+
+
+/* Unsigned.  */
+/* Define uintN_t types.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_STDINT_UINTN_H 1
+
+
+
+typedef __uint8_t uint8_t;
+typedef __uint16_t uint16_t;
+typedef __uint32_t uint32_t;
+typedef __uint64_t uint64_t;
+
+
+
+/* Small types.  */
+
+/* Signed.  */
+typedef __int_least8_t int_least8_t;
+typedef __int_least16_t int_least16_t;
+typedef __int_least32_t int_least32_t;
+typedef __int_least64_t int_least64_t;
+
+/* Unsigned.  */
+typedef __uint_least8_t uint_least8_t;
+typedef __uint_least16_t uint_least16_t;
+typedef __uint_least32_t uint_least32_t;
+typedef __uint_least64_t uint_least64_t;
+
+
+/* Fast types.  */
+
+/* Signed.  */
+typedef signed char		int_fast8_t;
+
+typedef long int		int_fast16_t;
+typedef long int		int_fast32_t;
+typedef long int		int_fast64_t;
+
+
+
+
+
+
+
+/* Unsigned.  */
+typedef unsigned char		uint_fast8_t;
+
+typedef unsigned long int	uint_fast16_t;
+typedef unsigned long int	uint_fast32_t;
+typedef unsigned long int	uint_fast64_t;
+
+
+
+
+
+
+
+
+/* Types for `void *' pointers.  */
+
+
+typedef long int		intptr_t;
+#define __intptr_t_defined 
+
+typedef unsigned long int	uintptr_t;
+
+
+
+
+
+
+
+
+
+/* Largest integral types.  */
+typedef __intmax_t		intmax_t;
+typedef __uintmax_t		uintmax_t;
+
+
+
+#define __INT64_C(c) c ## L
+#define __UINT64_C(c) c ## UL
+
+
+
+
+
+/* Limits of integral types.  */
+
+/* Minimum of signed integral types.  */
+#define INT8_MIN (-128)
+#define INT16_MIN (-32767-1)
+#define INT32_MIN (-2147483647-1)
+#define INT64_MIN (-__INT64_C(9223372036854775807)-1)
+/* Maximum of signed integral types.  */
+#define INT8_MAX (127)
+#define INT16_MAX (32767)
+#define INT32_MAX (2147483647)
+#define INT64_MAX (__INT64_C(9223372036854775807))
+
+/* Maximum of unsigned integral types.  */
+#define UINT8_MAX (255)
+#define UINT16_MAX (65535)
+#define UINT32_MAX (4294967295U)
+#define UINT64_MAX (__UINT64_C(18446744073709551615))
+
+
+/* Minimum of signed integral types having a minimum size.  */
+#define INT_LEAST8_MIN (-128)
+#define INT_LEAST16_MIN (-32767-1)
+#define INT_LEAST32_MIN (-2147483647-1)
+#define INT_LEAST64_MIN (-__INT64_C(9223372036854775807)-1)
+/* Maximum of signed integral types having a minimum size.  */
+#define INT_LEAST8_MAX (127)
+#define INT_LEAST16_MAX (32767)
+#define INT_LEAST32_MAX (2147483647)
+#define INT_LEAST64_MAX (__INT64_C(9223372036854775807))
+
+/* Maximum of unsigned integral types having a minimum size.  */
+#define UINT_LEAST8_MAX (255)
+#define UINT_LEAST16_MAX (65535)
+#define UINT_LEAST32_MAX (4294967295U)
+#define UINT_LEAST64_MAX (__UINT64_C(18446744073709551615))
+
+
+/* Minimum of fast signed integral types having a minimum size.  */
+#define INT_FAST8_MIN (-128)
+
+#define INT_FAST16_MIN (-9223372036854775807L-1)
+#define INT_FAST32_MIN (-9223372036854775807L-1)
+
+
+
+
+#define INT_FAST64_MIN (-__INT64_C(9223372036854775807)-1)
+/* Maximum of fast signed integral types having a minimum size.  */
+#define INT_FAST8_MAX (127)
+
+#define INT_FAST16_MAX (9223372036854775807L)
+#define INT_FAST32_MAX (9223372036854775807L)
+
+
+
+
+#define INT_FAST64_MAX (__INT64_C(9223372036854775807))
+
+/* Maximum of fast unsigned integral types having a minimum size.  */
+#define UINT_FAST8_MAX (255)
+
+#define UINT_FAST16_MAX (18446744073709551615UL)
+#define UINT_FAST32_MAX (18446744073709551615UL)
+
+
+
+
+#define UINT_FAST64_MAX (__UINT64_C(18446744073709551615))
+
+
+/* Values to test for integral types holding `void *' pointer.  */
+
+#define INTPTR_MIN (-9223372036854775807L-1)
+#define INTPTR_MAX (9223372036854775807L)
+#define UINTPTR_MAX (18446744073709551615UL)
+
+
+
+
+
+
+
+/* Minimum for largest signed integral type.  */
+#define INTMAX_MIN (-__INT64_C(9223372036854775807)-1)
+/* Maximum for largest signed integral type.  */
+#define INTMAX_MAX (__INT64_C(9223372036854775807))
+
+/* Maximum for largest unsigned integral type.  */
+#define UINTMAX_MAX (__UINT64_C(18446744073709551615))
+
+
+/* Limits of other integer types.  */
+
+/* Limits of `ptrdiff_t' type.  */
+
+#define PTRDIFF_MIN (-9223372036854775807L-1)
+#define PTRDIFF_MAX (9223372036854775807L)
+
+/* Limits of `sig_atomic_t'.  */
+#define SIG_ATOMIC_MIN (-2147483647-1)
+#define SIG_ATOMIC_MAX (2147483647)
+
+/* Limit of `size_t' type.  */
+
+#define SIZE_MAX (18446744073709551615UL)
+
+
+
+
+
+
+
+
+/* Limits of `wchar_t'.  */
+
+
+
+
+
+
+/* Limits of `wint_t'.  */
+#define WINT_MIN (0u)
+#define WINT_MAX (4294967295u)
+
+/* Signed.  */
+#define INT8_C(c) c
+#define INT16_C(c) c
+#define INT32_C(c) c
+
+#define INT64_C(c) c ## L
+
+
+
+
+/* Unsigned.  */
+#define UINT8_C(c) c
+#define UINT16_C(c) c
+#define UINT32_C(c) c ## U
+
+#define UINT64_C(c) c ## UL
+
+
+
+
+/* Maximal type.  */
+
+#define INTMAX_C(c) c ## L
+#define UINTMAX_C(c) c ## UL
+
+
+
+
+
+
+
+#define INT8_WIDTH 8
+#define UINT8_WIDTH 8
+#define INT16_WIDTH 16
+#define UINT16_WIDTH 16
+#define INT32_WIDTH 32
+#define UINT32_WIDTH 32
+#define INT64_WIDTH 64
+#define UINT64_WIDTH 64
+
+#define INT_LEAST8_WIDTH 8
+#define UINT_LEAST8_WIDTH 8
+#define INT_LEAST16_WIDTH 16
+#define UINT_LEAST16_WIDTH 16
+#define INT_LEAST32_WIDTH 32
+#define UINT_LEAST32_WIDTH 32
+#define INT_LEAST64_WIDTH 64
+#define UINT_LEAST64_WIDTH 64
+
+#define INT_FAST8_WIDTH 8
+#define UINT_FAST8_WIDTH 8
+#define INT_FAST16_WIDTH __WORDSIZE
+#define UINT_FAST16_WIDTH __WORDSIZE
+#define INT_FAST32_WIDTH __WORDSIZE
+#define UINT_FAST32_WIDTH __WORDSIZE
+#define INT_FAST64_WIDTH 64
+#define UINT_FAST64_WIDTH 64
+
+#define INTPTR_WIDTH __WORDSIZE
+#define UINTPTR_WIDTH __WORDSIZE
+
+#define INTMAX_WIDTH 64
+#define UINTMAX_WIDTH 64
+
+#define PTRDIFF_WIDTH __WORDSIZE
+#define SIG_ATOMIC_WIDTH 32
+#define SIZE_WIDTH __WORDSIZE
+#define WCHAR_WIDTH 32
+#define WINT_WIDTH 32
+
+
+
+
+
+
+#define _GCC_WRAP_STDINT_H 
+
+
+namespace std
+{
+
+  using ::int8_t;
+  using ::int16_t;
+  using ::int32_t;
+  using ::int64_t;
+
+  using ::int_fast8_t;
+  using ::int_fast16_t;
+  using ::int_fast32_t;
+  using ::int_fast64_t;
+
+  using ::int_least8_t;
+  using ::int_least16_t;
+  using ::int_least32_t;
+  using ::int_least64_t;
+
+  using ::intmax_t;
+  using ::intptr_t;
+  
+  using ::uint8_t;
+  using ::uint16_t;
+  using ::uint32_t;
+  using ::uint64_t;
+
+  using ::uint_fast8_t;
+  using ::uint_fast16_t;
+  using ::uint_fast32_t;
+  using ::uint_fast64_t;
+
+  using ::uint_least8_t;
+  using ::uint_least16_t;
+  using ::uint_least32_t;
+  using ::uint_least64_t;
+
+  using ::uintmax_t;
+  using ::uintptr_t;
+
+
+
+
+
+} // namespace std
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  template<>
+    struct char_traits<char16_t>
+    {
+      typedef char16_t          char_type;
+
+      typedef uint_least16_t    int_type;
+
+
+
+
+
+      typedef streamoff         off_type;
+      typedef u16streampos      pos_type;
+      typedef mbstate_t         state_type;
+
+
+
+
+      static _GLIBCXX17_CONSTEXPR void
+      assign(char_type& __c1, const char_type& __c2) noexcept
+      { __c1 = __c2; }
+
+      static constexpr bool
+      eq(const char_type& __c1, const char_type& __c2) noexcept
+      { return __c1 == __c2; }
+
+      static constexpr bool
+      lt(const char_type& __c1, const char_type& __c2) noexcept
+      { return __c1 < __c2; }
+
+      static _GLIBCXX17_CONSTEXPR int
+      compare(const char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  if (lt(__s1[__i], __s2[__i]))
+	    return -1;
+	  else if (lt(__s2[__i], __s1[__i]))
+	    return 1;
+	return 0;
+      }
+
+      static _GLIBCXX17_CONSTEXPR size_t
+      length(const char_type* __s)
+      {
+	size_t __i = 0;
+	while (!eq(__s[__i], char_type()))
+	  ++__i;
+	return __i;
+      }
+
+      static _GLIBCXX17_CONSTEXPR const char_type*
+      find(const char_type* __s, size_t __n, const char_type& __a)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  if (eq(__s[__i], __a))
+	    return __s + __i;
+	return 0;
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      move(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return (static_cast<char_type*>
+		(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      copy(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return (static_cast<char_type*>
+		(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      assign(char_type* __s, size_t __n, char_type __a)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  assign(__s[__i], __a);
+	return __s;
+      }
+
+      static constexpr char_type
+      to_char_type(const int_type& __c) noexcept
+      { return char_type(__c); }
+
+      static constexpr int_type
+      to_int_type(const char_type& __c) noexcept
+      { return __c == eof() ? int_type(0xfffd) : int_type(__c); }
+
+      static constexpr bool
+      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
+      { return __c1 == __c2; }
+
+      static constexpr int_type
+      eof() noexcept
+      { return static_cast<int_type>(-1); }
+
+      static constexpr int_type
+      not_eof(const int_type& __c) noexcept
+      { return eq_int_type(__c, eof()) ? 0 : __c; }
+    };
+
+  template<>
+    struct char_traits<char32_t>
+    {
+      typedef char32_t          char_type;
+
+      typedef uint_least32_t    int_type;
+
+
+
+
+
+      typedef streamoff         off_type;
+      typedef u32streampos      pos_type;
+      typedef mbstate_t         state_type;
+
+
+
+
+      static _GLIBCXX17_CONSTEXPR void
+      assign(char_type& __c1, const char_type& __c2) noexcept
+      { __c1 = __c2; }
+
+      static constexpr bool
+      eq(const char_type& __c1, const char_type& __c2) noexcept
+      { return __c1 == __c2; }
+
+      static constexpr bool
+      lt(const char_type& __c1, const char_type& __c2) noexcept
+      { return __c1 < __c2; }
+
+      static _GLIBCXX17_CONSTEXPR int
+      compare(const char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  if (lt(__s1[__i], __s2[__i]))
+	    return -1;
+	  else if (lt(__s2[__i], __s1[__i]))
+	    return 1;
+	return 0;
+      }
+
+      static _GLIBCXX17_CONSTEXPR size_t
+      length(const char_type* __s)
+      {
+	size_t __i = 0;
+	while (!eq(__s[__i], char_type()))
+	  ++__i;
+	return __i;
+      }
+
+      static _GLIBCXX17_CONSTEXPR const char_type*
+      find(const char_type* __s, size_t __n, const char_type& __a)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  if (eq(__s[__i], __a))
+	    return __s + __i;
+	return 0;
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      move(char_type* __s1, const char_type* __s2, size_t __n)
+      {
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return (static_cast<char_type*>
+		(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      copy(char_type* __s1, const char_type* __s2, size_t __n)
+      { 
+	if (__n == 0)
+	  return __s1;
+
+
+
+
+	return (static_cast<char_type*>
+		(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
+      }
+
+      static _GLIBCXX20_CONSTEXPR char_type*
+      assign(char_type* __s, size_t __n, char_type __a)
+      {
+	for (size_t __i = 0; __i < __n; ++__i)
+	  assign(__s[__i], __a);
+	return __s;
+      }
+
+      static constexpr char_type
+      to_char_type(const int_type& __c) noexcept
+      { return char_type(__c); }
+
+      static constexpr int_type
+      to_int_type(const char_type& __c) noexcept
+      { return int_type(__c); }
+
+      static constexpr bool
+      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
+      { return __c1 == __c2; }
+
+      static constexpr int_type
+      eof() noexcept
+      { return static_cast<int_type>(-1); }
+
+      static constexpr int_type
+      not_eof(const int_type& __c) noexcept
+      { return eq_int_type(__c, eof()) ? 0 : __c; }
+    };
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+
+// <locale> Forward declarations -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/localefwd.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{locale}
+ */
+
+//
+// ISO C++ 14882: 22.1  Locales
+//
+
+
+#define _LOCALE_FWD_H 1
+
+       
+
+
+// Wrapper for underlying C-language localization -*- C++ -*-
+
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/c++locale.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{locale}
+ */
+
+//
+// ISO C++ 14882: 22.8  Standard locale categories.
+//
+
+// Written by Benjamin Kosnik <bkoz@redhat.com>
+
+
+#define _GLIBCXX_CXX_LOCALE_H 1
+
+       
+
+// -*- C++ -*- forwarding header.
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file clocale
+ *  This is a Standard C++ Library file.  You should @c \#include this file
+ *  in your programs, rather than any of the @a *.h implementation files.
+ *
+ *  This is the C++ version of the Standard C Library header @c locale.h,
+ *  and its contents are (mostly) the same as that header, but are all
+ *  contained in the namespace @c std (except for names which are defined
+ *  as macros in C).
+ */
+
+//
+// ISO C++ 14882: 18.2.2  Implementation properties: C library
+//
+
+       
+
+
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ *	ISO C99 Standard: 7.11 Localization	<locale.h>
+ */
+
+
+#define _LOCALE_H 1
+
+
+
+#define __need_NULL 
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+
+
+
+
+
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+
+
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+
+
+
+
+
+
+
+
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+
+
+
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+/* If this symbol has done its job, get rid of it.  */
+#undef __need_ptrdiff_t
+
+
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_size_t
+
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_wchar_t
+
+
+
+
+
+
+/* A null pointer constant.  */
+
+
+#undef NULL
+
+#define NULL __null
+
+
+
+
+
+
+
+
+#undef __need_NULL
+
+
+
+/* Offset of member MEMBER in a struct of type TYPE. */
+#define offsetof(TYPE,MEMBER) __builtin_offsetof (TYPE, MEMBER)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* Definition of locale category symbol values.
+   Copyright (C) 2001-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+
+
+
+
+#define _BITS_LOCALE_H 1
+
+#define __LC_CTYPE 0
+#define __LC_NUMERIC 1
+#define __LC_TIME 2
+#define __LC_COLLATE 3
+#define __LC_MONETARY 4
+#define __LC_MESSAGES 5
+#define __LC_ALL 6
+#define __LC_PAPER 7
+#define __LC_NAME 8
+#define __LC_ADDRESS 9
+#define __LC_TELEPHONE 10
+#define __LC_MEASUREMENT 11
+#define __LC_IDENTIFICATION 12
+
+
+__BEGIN_DECLS
+
+/* These are the possibilities for the first argument to setlocale.
+   The code assumes that the lowest LC_* symbol has the value zero.  */
+#define LC_CTYPE __LC_CTYPE
+#define LC_NUMERIC __LC_NUMERIC
+#define LC_TIME __LC_TIME
+#define LC_COLLATE __LC_COLLATE
+#define LC_MONETARY __LC_MONETARY
+#define LC_MESSAGES __LC_MESSAGES
+#define LC_ALL __LC_ALL
+#define LC_PAPER __LC_PAPER
+#define LC_NAME __LC_NAME
+#define LC_ADDRESS __LC_ADDRESS
+#define LC_TELEPHONE __LC_TELEPHONE
+#define LC_MEASUREMENT __LC_MEASUREMENT
+#define LC_IDENTIFICATION __LC_IDENTIFICATION
+
+
+/* Structure giving information about numeric and monetary notation.  */
+struct lconv
+{
+  /* Numeric (non-monetary) information.  */
+
+  char *decimal_point;		/* Decimal point character.  */
+  char *thousands_sep;		/* Thousands separator.  */
+  /* Each element is the number of digits in each group;
+     elements with higher indices are farther left.
+     An element with value CHAR_MAX means that no further grouping is done.
+     An element with value 0 means that the previous element is used
+     for all groups farther left.  */
+  char *grouping;
+
+  /* Monetary information.  */
+
+  /* First three chars are a currency symbol from ISO 4217.
+     Fourth char is the separator.  Fifth char is '\0'.  */
+  char *int_curr_symbol;
+  char *currency_symbol;	/* Local currency symbol.  */
+  char *mon_decimal_point;	/* Decimal point character.  */
+  char *mon_thousands_sep;	/* Thousands separator.  */
+  char *mon_grouping;		/* Like `grouping' element (above).  */
+  char *positive_sign;		/* Sign for positive values.  */
+  char *negative_sign;		/* Sign for negative values.  */
+  char int_frac_digits;		/* Int'l fractional digits.  */
+  char frac_digits;		/* Local fractional digits.  */
+  /* 1 if currency_symbol precedes a positive value, 0 if succeeds.  */
+  char p_cs_precedes;
+  /* 1 iff a space separates currency_symbol from a positive value.  */
+  char p_sep_by_space;
+  /* 1 if currency_symbol precedes a negative value, 0 if succeeds.  */
+  char n_cs_precedes;
+  /* 1 iff a space separates currency_symbol from a negative value.  */
+  char n_sep_by_space;
+  /* Positive and negative sign positions:
+     0 Parentheses surround the quantity and currency_symbol.
+     1 The sign string precedes the quantity and currency_symbol.
+     2 The sign string follows the quantity and currency_symbol.
+     3 The sign string immediately precedes the currency_symbol.
+     4 The sign string immediately follows the currency_symbol.  */
+  char p_sign_posn;
+  char n_sign_posn;
+
+  /* 1 if int_curr_symbol precedes a positive value, 0 if succeeds.  */
+  char int_p_cs_precedes;
+  /* 1 iff a space separates int_curr_symbol from a positive value.  */
+  char int_p_sep_by_space;
+  /* 1 if int_curr_symbol precedes a negative value, 0 if succeeds.  */
+  char int_n_cs_precedes;
+  /* 1 iff a space separates int_curr_symbol from a negative value.  */
+  char int_n_sep_by_space;
+  /* Positive and negative sign positions:
+     0 Parentheses surround the quantity and int_curr_symbol.
+     1 The sign string precedes the quantity and int_curr_symbol.
+     2 The sign string follows the quantity and int_curr_symbol.
+     3 The sign string immediately precedes the int_curr_symbol.
+     4 The sign string immediately follows the int_curr_symbol.  */
+  char int_p_sign_posn;
+  char int_n_sign_posn;
+};
+
+
+/* Set and/or return the current locale.  */
+extern char *setlocale (int __category, const char *__locale) __THROW;
+
+/* Return the numeric/monetary information for the current locale.  */
+extern struct lconv *localeconv (void) __THROW;
+
+
+
+/* POSIX.1-2008 extends the locale interface with functions for
+   explicit creation and manipulation of 'locale_t' objects
+   representing locale contexts, and a set of parallel
+   locale-sensitive text processing functions that take a locale_t
+   argument.  This enables applications to work with data from
+   multiple locales simultaneously and thread-safely.  */
+
+
+/* Return a reference to a data structure representing a set of locale
+   datasets.  Unlike for the CATEGORY parameter for `setlocale' the
+   CATEGORY_MASK parameter here uses a single bit for each category,
+   made by OR'ing together LC_*_MASK bits above.  */
+extern locale_t newlocale (int __category_mask, const char *__locale,
+			   locale_t __base) __THROW;
+
+/* These are the bits that can be set in the CATEGORY_MASK argument to
+   `newlocale'.  In the GNU implementation, LC_FOO_MASK has the value
+   of (1 << LC_FOO), but this is not a part of the interface that
+   callers can assume will be true.  */
+#define LC_CTYPE_MASK (1 << __LC_CTYPE)
+#define LC_NUMERIC_MASK (1 << __LC_NUMERIC)
+#define LC_TIME_MASK (1 << __LC_TIME)
+#define LC_COLLATE_MASK (1 << __LC_COLLATE)
+#define LC_MONETARY_MASK (1 << __LC_MONETARY)
+#define LC_MESSAGES_MASK (1 << __LC_MESSAGES)
+#define LC_PAPER_MASK (1 << __LC_PAPER)
+#define LC_NAME_MASK (1 << __LC_NAME)
+#define LC_ADDRESS_MASK (1 << __LC_ADDRESS)
+#define LC_TELEPHONE_MASK (1 << __LC_TELEPHONE)
+#define LC_MEASUREMENT_MASK (1 << __LC_MEASUREMENT)
+#define LC_IDENTIFICATION_MASK (1 << __LC_IDENTIFICATION)
+#define LC_ALL_MASK (LC_CTYPE_MASK | LC_NUMERIC_MASK | LC_TIME_MASK | LC_COLLATE_MASK | LC_MONETARY_MASK | LC_MESSAGES_MASK | LC_PAPER_MASK | LC_NAME_MASK | LC_ADDRESS_MASK | LC_TELEPHONE_MASK | LC_MEASUREMENT_MASK | LC_IDENTIFICATION_MASK )
+
+/* Return a duplicate of the set of locale in DATASET.  All usage
+   counters are increased if necessary.  */
+extern locale_t duplocale (locale_t __dataset) __THROW;
+
+/* Free the data associated with a locale dataset previously returned
+   by a call to `setlocale_r'.  */
+extern void freelocale (locale_t __dataset) __THROW;
+
+/* Switch the current thread's locale to DATASET.
+   If DATASET is null, instead just return the current setting.
+   The special value LC_GLOBAL_LOCALE is the initial setting
+   for all threads and can also be installed any time, meaning
+   the thread uses the global settings controlled by `setlocale'.  */
+extern locale_t uselocale (locale_t __dataset) __THROW;
+
+/* This value can be passed to `uselocale' and may be returned by it.
+   Passing this value to any other function has undefined behavior.  */
+#define LC_GLOBAL_LOCALE ((locale_t) -1L)
+
+
+
+__END_DECLS
+
+
+
+#define _GLIBCXX_CLOCALE 1
+
+// Get rid of those macros defined in <locale.h> in lieu of real functions.
+#undef setlocale
+#undef localeconv
+
+namespace std
+{
+  using ::lconv;
+  using ::setlocale;
+  using ::localeconv;
+} // namespace std
+
+
+#define _GLIBCXX_C_LOCALE_GNU 1
+
+#define _GLIBCXX_NUM_CATEGORIES 6
+
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  extern "C" __typeof(uselocale) __uselocale;
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  typedef __locale_t		__c_locale;
+
+  // Convert numeric value of type double and long double to string and
+  // return length of string.  If vsnprintf is available use it, otherwise
+  // fall back to the unsafe vsprintf which, in general, can be dangerous
+  // and should be avoided.
+  inline int
+  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
+		   char* __out,
+		   const int __size __attribute__ ((__unused__)),
+		   const char* __fmt, ...)
+  {
+
+    __c_locale __old = __gnu_cxx::__uselocale(__cloc);
+
+    __builtin_va_list __args;
+    __builtin_va_start(__args, __fmt);
+
+
+    const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
+
+
+
+
+    __builtin_va_end(__args);
+
+
+    __gnu_cxx::__uselocale(__old);
+
+
+
+
+
+
+
+    return __ret;
+  }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+
+// -*- C++ -*- forwarding header.
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/cctype
+ *  This is a Standard C++ Library file.  You should @c \#include this file
+ *  in your programs, rather than any of the @a *.h implementation files.
+ *
+ *  This is the C++ version of the Standard C Library header @c ctype.h,
+ *  and its contents are (mostly) the same as that header, but are all
+ *  contained in the namespace @c std (except for names which are defined
+ *  as macros in C).
+ */
+
+//
+// ISO C++ 14882: <ccytpe>
+//
+
+       
+
+
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ *	ISO C99 Standard 7.4: Character handling	<ctype.h>
+ */
+
+
+#define _CTYPE_H 1
+
+
+
+
+__BEGIN_DECLS
+
+
+/* These are all the characteristics of characters.
+   If there get to be more than 16 distinct characteristics,
+   many things must be changed that use `unsigned short int's.
+
+   The characteristics are stored always in network byte order (big
+   endian).  We define the bit value interpretations here dependent on the
+   machine's byte order.  */
+
+/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _ENDIAN_H 1
+
+
+
+/* Definitions for byte order, according to significance of bytes,
+   from low addresses to high addresses.  The value is what you get by
+   putting '4' in the most significant byte, '3' in the second most
+   significant byte, '2' in the second least significant byte, and '1'
+   in the least significant byte, and then writing down one digit for
+   each byte, starting with the byte at the lowest address at the left,
+   and proceeding to the byte with the highest address at the right.  */
+
+#define __LITTLE_ENDIAN 1234
+#define __BIG_ENDIAN 4321
+#define __PDP_ENDIAN 3412
+
+/* This file defines `__BYTE_ORDER' for the particular machine.  */
+/* i386/x86_64 are little-endian.  */
+
+
+
+
+
+#define __BYTE_ORDER __LITTLE_ENDIAN
+
+/* Some machines may need to use a different endianness for floating point
+   values.  */
+
+#define __FLOAT_WORD_ORDER __BYTE_ORDER
+
+
+
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#define BIG_ENDIAN __BIG_ENDIAN
+#define PDP_ENDIAN __PDP_ENDIAN
+#define BYTE_ORDER __BYTE_ORDER
+
+
+
+#define __LONG_LONG_PAIR(HI,LO) LO, HI
+
+
+
+
+
+
+/* Conversion interfaces.  */
+/* Macros and inline functions to swap the order of bytes in integer values.
+   Copyright (C) 1997-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+
+
+
+
+#define _BITS_BYTESWAP_H 1
+
+
+
+
+/* Swap bytes in 16-bit value.  */
+#define __bswap_constant_16(x) ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
+
+
+static __inline __uint16_t
+__bswap_16 (__uint16_t __bsx)
+{
+
+  return __builtin_bswap16 (__bsx);
+
+
+
+}
+
+/* Swap bytes in 32-bit value.  */
+#define __bswap_constant_32(x) ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
+
+
+
+static __inline __uint32_t
+__bswap_32 (__uint32_t __bsx)
+{
+
+  return __builtin_bswap32 (__bsx);
+
+
+
+}
+
+/* Swap bytes in 64-bit value.  */
+#define __bswap_constant_64(x) ((((x) & 0xff00000000000000ull) >> 56) | (((x) & 0x00ff000000000000ull) >> 40) | (((x) & 0x0000ff0000000000ull) >> 24) | (((x) & 0x000000ff00000000ull) >> 8) | (((x) & 0x00000000ff000000ull) << 8) | (((x) & 0x0000000000ff0000ull) << 24) | (((x) & 0x000000000000ff00ull) << 40) | (((x) & 0x00000000000000ffull) << 56))
+
+__extension__ static __inline __uint64_t
+__bswap_64 (__uint64_t __bsx)
+{
+
+  return __builtin_bswap64 (__bsx);
+
+
+
+}
+
+/* Inline functions to return unsigned integer values unchanged.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+
+
+
+
+#define _BITS_UINTN_IDENTITY_H 1
+
+
+
+/* These inline functions are to ensure the appropriate type
+   conversions and associated diagnostics from macros that convert to
+   a given endianness.  */
+
+static __inline __uint16_t
+__uint16_identity (__uint16_t __x)
+{
+  return __x;
+}
+
+static __inline __uint32_t
+__uint32_identity (__uint32_t __x)
+{
+  return __x;
+}
+
+static __inline __uint64_t
+__uint64_identity (__uint64_t __x)
+{
+  return __x;
+}
+
+
+
+#define htobe16(x) __bswap_16 (x)
+#define htole16(x) __uint16_identity (x)
+#define be16toh(x) __bswap_16 (x)
+#define le16toh(x) __uint16_identity (x)
+
+#define htobe32(x) __bswap_32 (x)
+#define htole32(x) __uint32_identity (x)
+#define be32toh(x) __bswap_32 (x)
+#define le32toh(x) __uint32_identity (x)
+
+#define htobe64(x) __bswap_64 (x)
+#define htole64(x) __uint64_identity (x)
+#define be64toh(x) __bswap_64 (x)
+#define le64toh(x) __uint64_identity (x)
+
+
+
+
+
+
+#define _ISbit(bit) ((bit) < 8 ? ((1 << (bit)) << 8) : ((1 << (bit)) >> 8))
+
+
+enum
+{
+  _ISupper = _ISbit (0),	/* UPPERCASE.  */
+  _ISlower = _ISbit (1),	/* lowercase.  */
+  _ISalpha = _ISbit (2),	/* Alphabetic.  */
+  _ISdigit = _ISbit (3),	/* Numeric.  */
+  _ISxdigit = _ISbit (4),	/* Hexadecimal numeric.  */
+  _ISspace = _ISbit (5),	/* Whitespace.  */
+  _ISprint = _ISbit (6),	/* Printing.  */
+  _ISgraph = _ISbit (7),	/* Graphical.  */
+  _ISblank = _ISbit (8),	/* Blank (usually SPC and TAB).  */
+  _IScntrl = _ISbit (9),	/* Control character.  */
+  _ISpunct = _ISbit (10),	/* Punctuation.  */
+  _ISalnum = _ISbit (11)	/* Alphanumeric.  */
+};
+
+
+/* These are defined in ctype-info.c.
+   The declarations here must match those in localeinfo.h.
+
+   In the thread-specific locale model (see `uselocale' in <locale.h>)
+   we cannot use global variables for these as was done in the past.
+   Instead, the following accessor functions return the address of
+   each variable, which is local to the current thread if multithreaded.
+
+   These point into arrays of 384, so they can be indexed by any `unsigned
+   char' value [0,255]; by EOF (-1); or by any `signed char' value
+   [-128,-1).  ISO C requires that the ctype functions work for `unsigned
+   char' values and for EOF; we also support negative `signed char' values
+   for broken old programs.  The case conversion arrays are of `int's
+   rather than `unsigned char's because tolower (EOF) must be EOF, which
+   doesn't fit into an `unsigned char'.  But today more important is that
+   the arrays are also used for multi-byte character sets.  */
+extern const unsigned short int **__ctype_b_loc (void)
+     __THROW __attribute__ ((__const__));
+extern const __int32_t **__ctype_tolower_loc (void)
+     __THROW __attribute__ ((__const__));
+extern const __int32_t **__ctype_toupper_loc (void)
+     __THROW __attribute__ ((__const__));
+
+
+
+#define __isascii(c) (((c) & ~0x7f) == 0)
+#define __toascii(c) ((c) & 0x7f)
+
+#define __exctype(name) extern int name (int) __THROW
+
+/* The following names are all functions:
+     int isCHARACTERISTIC(int c);
+   which return nonzero iff C has CHARACTERISTIC.
+   For the meaning of the characteristic names, see the `enum' above.  */
+__exctype (isalnum);
+__exctype (isalpha);
+__exctype (iscntrl);
+__exctype (isdigit);
+__exctype (islower);
+__exctype (isgraph);
+__exctype (isprint);
+__exctype (ispunct);
+__exctype (isspace);
+__exctype (isupper);
+__exctype (isxdigit);
+
+
+/* Return the lowercase version of C.  */
+extern int tolower (int __c) __THROW;
+
+/* Return the uppercase version of C.  */
+extern int toupper (int __c) __THROW;
+
+
+/* ISO C99 introduced one new function.  */
+
+__exctype (isblank);
+
+
+
+/* Test C for a set of character classes according to MASK.  */
+extern int isctype (int __c, int __mask) __THROW;
+
+
+
+
+/* Return nonzero iff C is in the ASCII set
+   (i.e., is no more than 7 bits wide).  */
+extern int isascii (int __c) __THROW;
+
+/* Return the part of C that is in the ASCII set
+   (i.e., the low-order 7 bits of C).  */
+extern int toascii (int __c) __THROW;
+
+/* These are the same as `toupper' and `tolower' except that they do not
+   check the argument for being in the range of a `char'.  */
+__exctype (_toupper);
+__exctype (_tolower);
+
+
+/* This code is needed for the optimized mapping functions.  */
+#define __tobody(c,f,a,args) (__extension__ ({ int __res; if (sizeof (c) > 1) { if (__builtin_constant_p (c)) { int __c = (c); __res = __c < -128 || __c > 255 ? __c : (a)[__c]; } else __res = f args; } else __res = (a)[(int) (c)]; __res; }))
+
+
+
+
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+
+
+/* These definitions are similar to the ones above but all functions
+   take as an argument a handle for the locale which shall be used.  */
+#define __isctype_l(c,type,locale) ((locale)->__ctype_b[(int) (c)] & (unsigned short int) type)
+
+
+#define __exctype_l(name) extern int name (int, locale_t) __THROW
+
+
+/* The following names are all functions:
+     int isCHARACTERISTIC(int c, locale_t *locale);
+   which return nonzero iff C has CHARACTERISTIC.
+   For the meaning of the characteristic names, see the `enum' above.  */
+__exctype_l (isalnum_l);
+__exctype_l (isalpha_l);
+__exctype_l (iscntrl_l);
+__exctype_l (isdigit_l);
+__exctype_l (islower_l);
+__exctype_l (isgraph_l);
+__exctype_l (isprint_l);
+__exctype_l (ispunct_l);
+__exctype_l (isspace_l);
+__exctype_l (isupper_l);
+__exctype_l (isxdigit_l);
+
+__exctype_l (isblank_l);
+
+
+/* Return the lowercase version of C in locale L.  */
+extern int __tolower_l (int __c, locale_t __l) __THROW;
+extern int tolower_l (int __c, locale_t __l) __THROW;
+
+/* Return the uppercase version of C.  */
+extern int __toupper_l (int __c, locale_t __l) __THROW;
+extern int toupper_l (int __c, locale_t __l) __THROW;
+
+
+
+
+
+
+__END_DECLS
+
+
+
+#define _GLIBCXX_CCTYPE 1
+
+// Get rid of those macros defined in <ctype.h> in lieu of real functions.
+#undef isalnum
+#undef isalpha
+#undef iscntrl
+#undef isdigit
+#undef isgraph
+#undef islower
+#undef isprint
+#undef ispunct
+#undef isspace
+#undef isupper
+#undef isxdigit
+#undef tolower
+#undef toupper
+
+namespace std
+{
+  using ::isalnum;
+  using ::isalpha;
+  using ::iscntrl;
+  using ::isdigit;
+  using ::isgraph;
+  using ::islower;
+  using ::isprint;
+  using ::ispunct;
+  using ::isspace;
+  using ::isupper;
+  using ::isxdigit;
+  using ::tolower;
+  using ::toupper;
+} // namespace std
+
+
+
+
+
+#undef isblank
+
+namespace std
+{
+  using ::isblank;
+} // namespace std
+
+
+
+
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /** 
+   *  @defgroup locales Locales
+   *
+   *  Classes and functions for internationalization and localization.
+   */
+
+  // 22.1.1 Locale
+  class locale;
+
+  template<typename _Facet>
+    bool
+    has_facet(const locale&) throw();
+
+  template<typename _Facet>
+    const _Facet&
+    use_facet(const locale&);
+
+  // 22.1.3 Convenience interfaces
+  template<typename _CharT>
+    bool
+    isspace(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isprint(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    iscntrl(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isupper(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    islower(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isalpha(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isdigit(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    ispunct(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isxdigit(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isalnum(_CharT, const locale&);
+
+  template<typename _CharT>
+    bool
+    isgraph(_CharT, const locale&);
+
+
+  template<typename _CharT>
+    bool
+    isblank(_CharT, const locale&);
+
+
+  template<typename _CharT>
+    _CharT
+    toupper(_CharT, const locale&);
+
+  template<typename _CharT>
+    _CharT
+    tolower(_CharT, const locale&);
+
+  // 22.2.1 and 22.2.1.3 ctype
+  struct ctype_base;
+  template<typename _CharT>
+    class ctype;
+  template<> class ctype<char>;
+
+  template<> class ctype<wchar_t>;
+
+  template<typename _CharT>
+    class ctype_byname;
+  // NB: Specialized for char and wchar_t in locale_facets.h.
+
+  class codecvt_base;
+  template<typename _InternT, typename _ExternT, typename _StateT>
+    class codecvt;
+  template<> class codecvt<char, char, mbstate_t>;
+
+  template<> class codecvt<wchar_t, char, mbstate_t>;
+
+
+  template<> class codecvt<char16_t, char, mbstate_t>;
+  template<> class codecvt<char32_t, char, mbstate_t>;
+
+
+
+
+
+  template<typename _InternT, typename _ExternT, typename _StateT>
+    class codecvt_byname;
+
+  // 22.2.2 and 22.2.3 numeric
+_GLIBCXX_BEGIN_NAMESPACE_LDBL
+  template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
+    class num_get;
+  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
+    class num_put;
+_GLIBCXX_END_NAMESPACE_LDBL
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+  template<typename _CharT> class numpunct;
+  template<typename _CharT> class numpunct_byname;
+_GLIBCXX_END_NAMESPACE_CXX11
+
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+  // 22.2.4 collation
+  template<typename _CharT>
+    class collate;
+  template<typename _CharT>
+    class collate_byname;
+_GLIBCXX_END_NAMESPACE_CXX11
+
+  // 22.2.5 date and time
+  class time_base;
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+  template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
+    class time_get;
+  template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
+    class time_get_byname;
+_GLIBCXX_END_NAMESPACE_CXX11
+  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
+    class time_put;
+  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
+    class time_put_byname;
+
+  // 22.2.6 money
+  class money_base;
+_GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11
+  template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
+    class money_get;
+  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
+    class money_put;
+_GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+  template<typename _CharT, bool _Intl = false>
+    class moneypunct;
+  template<typename _CharT, bool _Intl = false>
+    class moneypunct_byname;
+_GLIBCXX_END_NAMESPACE_CXX11
+
+  // 22.2.7 message retrieval
+  struct messages_base;
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
+  template<typename _CharT>
+    class messages;
+  template<typename _CharT>
+    class messages_byname;
+_GLIBCXX_END_NAMESPACE_CXX11
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+// Iostreams base classes -*- C++ -*-
+
+// Copyright (C) 1997-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/ios_base.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{ios}
+ */
+
+//
+// ISO C++ 14882: 27.4  Iostreams base classes
+//
+
+
+#define _IOS_BASE_H 1
+
+       
+
+// Support for atomic operations -*- C++ -*-
+
+// Copyright (C) 2004-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file ext/atomicity.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+
+#define _GLIBCXX_ATOMICITY_H 1
+
+       
+
+
+/* Threads compatibility routines for libgcc2.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+#define _GLIBCXX_GCC_GTHR_H 
+
+
+#pragma GCC visibility push(default)
+
+
+/* If this file is compiled with threads support, it must
+       #define __GTHREADS 1
+   to indicate that threads support is present.  Also it has define
+   function
+     int __gthread_active_p ()
+   that returns 1 if thread system is active, 0 if not.
+
+   The threads interface must define the following types:
+     __gthread_key_t
+     __gthread_once_t
+     __gthread_mutex_t
+     __gthread_recursive_mutex_t
+
+   The threads interface must define the following macros:
+
+     __GTHREAD_ONCE_INIT
+     		to initialize __gthread_once_t
+     __GTHREAD_MUTEX_INIT
+     		to initialize __gthread_mutex_t to get a fast
+		non-recursive mutex.
+     __GTHREAD_MUTEX_INIT_FUNCTION
+		to initialize __gthread_mutex_t to get a fast
+		non-recursive mutex.
+		Define this to a function which looks like this:
+		  void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
+     		Some systems can't initialize a mutex without a
+		function call.  Don't define __GTHREAD_MUTEX_INIT in this case.
+     __GTHREAD_RECURSIVE_MUTEX_INIT
+     __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
+     		as above, but for a recursive mutex.
+
+   The threads interface must define the following static functions:
+
+     int __gthread_once (__gthread_once_t *once, void (*func) ())
+
+     int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
+     int __gthread_key_delete (__gthread_key_t key)
+
+     void *__gthread_getspecific (__gthread_key_t key)
+     int __gthread_setspecific (__gthread_key_t key, const void *ptr)
+
+     int __gthread_mutex_destroy (__gthread_mutex_t *mutex);
+     int __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex);
+
+     int __gthread_mutex_lock (__gthread_mutex_t *mutex);
+     int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
+     int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
+
+     int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex);
+     int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex);
+     int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex);
+
+   The following are supported in POSIX threads only. They are required to
+   fix a deadlock in static initialization inside libsupc++. The header file
+   gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra
+   features are supported.
+
+   Types:
+     __gthread_cond_t
+
+   Macros:
+     __GTHREAD_COND_INIT
+     __GTHREAD_COND_INIT_FUNCTION
+
+   Interface:
+     int __gthread_cond_broadcast (__gthread_cond_t *cond);
+     int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex);
+     int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
+					__gthread_recursive_mutex_t *mutex);
+
+   All functions returning int should return zero on success or the error
+   number.  If the operation is not supported, -1 is returned.
+
+   If the following are also defined, you should
+     #define __GTHREADS_CXX0X 1
+   to enable the c++0x thread library.
+
+   Types:
+     __gthread_t
+     __gthread_time_t
+
+   Interface:
+     int __gthread_create (__gthread_t *thread, void *(*func) (void*),
+                           void *args);
+     int __gthread_join (__gthread_t thread, void **value_ptr);
+     int __gthread_detach (__gthread_t thread);
+     int __gthread_equal (__gthread_t t1, __gthread_t t2);
+     __gthread_t __gthread_self (void);
+     int __gthread_yield (void);
+
+     int __gthread_mutex_timedlock (__gthread_mutex_t *m,
+                                    const __gthread_time_t *abs_timeout);
+     int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m,
+                                          const __gthread_time_t *abs_time);
+
+     int __gthread_cond_signal (__gthread_cond_t *cond);
+     int __gthread_cond_timedwait (__gthread_cond_t *cond,
+                                   __gthread_mutex_t *mutex,
+                                   const __gthread_time_t *abs_timeout);
+
+*/
+
+
+/* The pe-coff weak support isn't fully compatible to ELF's weak.
+   For static libraries it might would work, but as we need to deal
+   with shared versions too, we disable it for mingw-targets.  */
+
+
+
+
+
+
+#define _GLIBCXX_GTHREAD_USE_WEAK 1
+
+
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+#define _GLIBCXX_GCC_GTHR_POSIX_H 
+
+/* POSIX threads specific definitions.
+   Easy, since the interface is just one-to-one mapping.  */
+
+#define __GTHREADS 1
+#define __GTHREADS_CXX0X 1
+
+/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _PTHREAD_H 1
+
+
+
+/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _SCHED_H 1
+
+
+
+/* Get type definitions.  */
+
+
+#define __need_size_t 
+#define __need_NULL 
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+
+
+
+
+
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+
+
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+
+
+
+
+
+
+
+
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+
+
+
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+/* If this symbol has done its job, get rid of it.  */
+#undef __need_ptrdiff_t
+
+
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_size_t
+
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_wchar_t
+
+
+
+
+
+
+/* A null pointer constant.  */
+
+
+#undef NULL
+
+#define NULL __null
+
+
+
+
+
+
+
+
+#undef __need_NULL
+
+
+
+/* Offset of member MEMBER in a struct of type TYPE. */
+#define offsetof(TYPE,MEMBER) __builtin_offsetof (TYPE, MEMBER)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#define __time_t_defined 1
+
+
+
+/* Returned by `time'.  */
+typedef __time_t time_t;
+
+/* NB: Include guard matches what <linux/time.h> uses.  */
+
+#define _STRUCT_TIMESPEC 1
+
+
+
+/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
+   has nanoseconds instead of microseconds.  */
+struct timespec
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __syscall_slong_t tv_nsec;	/* Nanoseconds.  */
+};
+
+
+
+
+
+
+typedef __pid_t pid_t;
+#define __pid_t_defined 
+
+
+/* Get system specific constant and data structure definitions.  */
+/* Definitions of constants and data structure for POSIX 1003.1b-1993
+   scheduling interface.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_SCHED_H 1
+
+
+
+
+
+/* Scheduling algorithms.  */
+#define SCHED_OTHER 0
+#define SCHED_FIFO 1
+#define SCHED_RR 2
+
+#define SCHED_BATCH 3
+#define SCHED_ISO 4
+#define SCHED_IDLE 5
+#define SCHED_DEADLINE 6
+
+#define SCHED_RESET_ON_FORK 0x40000000
+
+
+
+/* Cloning flags.  */
+#define CSIGNAL 0x000000ff
+#define CLONE_VM 0x00000100
+#define CLONE_FS 0x00000200
+#define CLONE_FILES 0x00000400
+#define CLONE_SIGHAND 0x00000800
+#define CLONE_PTRACE 0x00002000
+#define CLONE_VFORK 0x00004000
+
+#define CLONE_PARENT 0x00008000
+
+#define CLONE_THREAD 0x00010000
+#define CLONE_NEWNS 0x00020000
+#define CLONE_SYSVSEM 0x00040000
+#define CLONE_SETTLS 0x00080000
+#define CLONE_PARENT_SETTID 0x00100000
+
+#define CLONE_CHILD_CLEARTID 0x00200000
+
+#define CLONE_DETACHED 0x00400000
+#define CLONE_UNTRACED 0x00800000
+
+#define CLONE_CHILD_SETTID 0x01000000
+
+#define CLONE_NEWCGROUP 0x02000000
+#define CLONE_NEWUTS 0x04000000
+#define CLONE_NEWIPC 0x08000000
+#define CLONE_NEWUSER 0x10000000
+#define CLONE_NEWPID 0x20000000
+#define CLONE_NEWNET 0x40000000
+#define CLONE_IO 0x80000000
+
+
+/* Sched parameter structure.  Generic version.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library;  if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_TYPES_STRUCT_SCHED_PARAM 1
+
+/* Data structure to describe a process' schedulability.  */
+struct sched_param
+{
+  int sched_priority;
+};
+
+
+__BEGIN_DECLS
+
+
+/* Clone current process.  */
+extern int clone (int (*__fn) (void *__arg), void *__child_stack,
+		  int __flags, void *__arg, ...) __THROW;
+
+/* Unshare the specified resources.  */
+extern int unshare (int __flags) __THROW;
+
+/* Get index of currently used CPU.  */
+extern int sched_getcpu (void) __THROW;
+
+/* Switch process to namespace of type NSTYPE indicated by FD.  */
+extern int setns (int __fd, int __nstype) __THROW;
+
+
+__END_DECLS
+
+/* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993
+   scheduling interface.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_CPU_SET_H 1
+
+
+
+
+
+/* Size definition for CPU sets.  */
+#define __CPU_SETSIZE 1024
+#define __NCPUBITS (8 * sizeof (__cpu_mask))
+
+/* Type for array elements in 'cpu_set_t'.  */
+typedef __CPU_MASK_TYPE __cpu_mask;
+
+/* Basic access functions.  */
+#define __CPUELT(cpu) ((cpu) / __NCPUBITS)
+#define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
+
+/* Data structure to describe CPU mask.  */
+typedef struct
+{
+  __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
+} cpu_set_t;
+
+/* Access functions for CPU masks.  */
+
+#define __CPU_ZERO_S(setsize,cpusetp) do __builtin_memset (cpusetp, '\0', setsize); while (0)
+
+#define __CPU_SET_S(cpu,setsize,cpusetp) (__extension__ ({ size_t __cpu = (cpu); __cpu / 8 < (setsize) ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] |= __CPUMASK (__cpu)) : 0; }))
+
+
+
+
+
+
+#define __CPU_CLR_S(cpu,setsize,cpusetp) (__extension__ ({ size_t __cpu = (cpu); __cpu / 8 < (setsize) ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] &= ~__CPUMASK (__cpu)) : 0; }))
+
+
+
+
+
+
+#define __CPU_ISSET_S(cpu,setsize,cpusetp) (__extension__ ({ size_t __cpu = (cpu); __cpu / 8 < (setsize) ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] & __CPUMASK (__cpu))) != 0 : 0; }))
+
+
+
+
+
+
+
+#define __CPU_COUNT_S(setsize,cpusetp) __sched_cpucount (setsize, cpusetp)
+
+
+
+#define __CPU_EQUAL_S(setsize,cpusetp1,cpusetp2) (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
+
+
+#define __CPU_OP_S(setsize,destset,srcset1,srcset2,op) (__extension__ ({ cpu_set_t *__dest = (destset); const __cpu_mask *__arr1 = (srcset1)->__bits; const __cpu_mask *__arr2 = (srcset2)->__bits; size_t __imax = (setsize) / sizeof (__cpu_mask); size_t __i; for (__i = 0; __i < __imax; ++__i) ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; __dest; }))
+
+#define __CPU_ALLOC_SIZE(count) ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
+
+#define __CPU_ALLOC(count) __sched_cpualloc (count)
+#define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
+
+__BEGIN_DECLS
+
+extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
+     __THROW;
+extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
+extern void __sched_cpufree (cpu_set_t *__set) __THROW;
+
+__END_DECLS
+
+
+/* Backward compatibility.  */
+#define sched_priority sched_priority
+#define __sched_priority sched_priority
+
+
+__BEGIN_DECLS
+
+/* Set scheduling parameters for a process.  */
+extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
+     __THROW;
+
+/* Retrieve scheduling parameters for a particular process.  */
+extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
+
+/* Set scheduling algorithm and/or parameters for a process.  */
+extern int sched_setscheduler (__pid_t __pid, int __policy,
+			       const struct sched_param *__param) __THROW;
+
+/* Retrieve scheduling algorithm for a particular purpose.  */
+extern int sched_getscheduler (__pid_t __pid) __THROW;
+
+/* Yield the processor.  */
+extern int sched_yield (void) __THROW;
+
+/* Get maximum priority value for a scheduler.  */
+extern int sched_get_priority_max (int __algorithm) __THROW;
+
+/* Get minimum priority value for a scheduler.  */
+extern int sched_get_priority_min (int __algorithm) __THROW;
+
+/* Get the SCHED_RR interval for the named process.  */
+extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
+
+
+
+/* Access macros for `cpu_set'.  */
+#define CPU_SETSIZE __CPU_SETSIZE
+#define CPU_SET(cpu,cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
+#define CPU_CLR(cpu,cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
+#define CPU_ISSET(cpu,cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), cpusetp)
+
+#define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
+#define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
+
+#define CPU_SET_S(cpu,setsize,cpusetp) __CPU_SET_S (cpu, setsize, cpusetp)
+#define CPU_CLR_S(cpu,setsize,cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp)
+#define CPU_ISSET_S(cpu,setsize,cpusetp) __CPU_ISSET_S (cpu, setsize, cpusetp)
+
+#define CPU_ZERO_S(setsize,cpusetp) __CPU_ZERO_S (setsize, cpusetp)
+#define CPU_COUNT_S(setsize,cpusetp) __CPU_COUNT_S (setsize, cpusetp)
+
+#define CPU_EQUAL(cpusetp1,cpusetp2) __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
+
+#define CPU_EQUAL_S(setsize,cpusetp1,cpusetp2) __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
+
+
+#define CPU_AND(destset,srcset1,srcset2) __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
+
+#define CPU_OR(destset,srcset1,srcset2) __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
+
+#define CPU_XOR(destset,srcset1,srcset2) __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
+
+#define CPU_AND_S(setsize,destset,srcset1,srcset2) __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
+
+#define CPU_OR_S(setsize,destset,srcset1,srcset2) __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
+
+#define CPU_XOR_S(setsize,destset,srcset1,srcset2) __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
+
+
+#define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
+#define CPU_ALLOC(count) __CPU_ALLOC (count)
+#define CPU_FREE(cpuset) __CPU_FREE (cpuset)
+
+
+/* Set the CPU affinity for a task */
+extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
+			      const cpu_set_t *__cpuset) __THROW;
+
+/* Get the CPU affinity for a task */
+extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
+			      cpu_set_t *__cpuset) __THROW;
+
+
+__END_DECLS
+
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ *	ISO C99 Standard: 7.23 Date and time	<time.h>
+ */
+
+
+#define _TIME_H 1
+
+
+
+#define __need_size_t 
+#define __need_NULL 
+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/*
+ * ISO C Standard:  7.17  Common definitions  <stddef.h>
+ */
+
+
+
+
+
+
+/* Any one of these symbols __need_* means that GNU libc
+   wants us just to define one data type.  So don't define
+   the symbols that indicate this file's entire job has been done.  */
+
+
+/* This avoids lossage on SunOS but only if stdtypes.h comes first.
+   There's no way to win with the other order!  Sun lossage.  */
+
+
+
+
+
+
+
+
+
+
+/* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
+   Just ignore it.  */
+
+
+
+
+/* On VxWorks, <type/vxTypesBase.h> may have defined macros like
+   _TYPE_size_t which will typedef size_t.  fixincludes patched the
+   vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
+   not defined, and so that defining this macro defines _GCC_SIZE_T.
+   If we find that the macros are still defined at this point, we must
+   invoke them so that the type is defined as expected.  */
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* In case nobody has defined these types, but we aren't running under
+   GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
+   __WCHAR_TYPE__ have reasonable values.  This can happen if the
+   parts of GCC is compiled by an older compiler, that actually
+   include gstddef.h, such as collect2.  */
+
+/* Signed type of difference of two pointers.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+
+/* If this symbol has done its job, get rid of it.  */
+#undef __need_ptrdiff_t
+
+
+
+/* Unsigned type of `sizeof' something.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_size_t
+
+
+
+/* Wide character type.
+   Locale-writers should change this as necessary to
+   be big enough to hold unique values not between 0 and 127,
+   and not (wchar_t) -1, for each defined multibyte character.  */
+
+/* Define this type if we are doing the whole job,
+   or if we want this type in particular.  */
+
+#undef __need_wchar_t
+
+
+
+
+
+
+/* A null pointer constant.  */
+
+
+#undef NULL
+
+#define NULL __null
+
+
+
+
+
+
+
+
+#undef __need_NULL
+
+
+
+/* Offset of member MEMBER in a struct of type TYPE. */
+#define offsetof(TYPE,MEMBER) __builtin_offsetof (TYPE, MEMBER)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* This defines CLOCKS_PER_SEC, which is the number of processor clock
+   ticks per second, and possibly a number of other constants.   */
+/* System-dependent timing definitions.  Linux version.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ * Never include this file directly; use <time.h> instead.
+ */
+
+
+#define _BITS_TIME_H 1
+
+
+
+/* ISO/IEC 9899:1999 7.23.1: Components of time
+   The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is
+   the number per second of the value returned by the `clock' function.  */
+/* CAE XSH, Issue 4, Version 2: <time.h>
+   The value of CLOCKS_PER_SEC is required to be 1 million on all
+   XSI-conformant systems. */
+#define CLOCKS_PER_SEC ((__clock_t) 1000000)
+
+
+
+
+
+
+
+
+
+
+/* Identifier for system-wide realtime clock.  */
+#define CLOCK_REALTIME 0
+/* Monotonic system-wide clock.  */
+#define CLOCK_MONOTONIC 1
+/* High-resolution timer from the CPU.  */
+#define CLOCK_PROCESS_CPUTIME_ID 2
+/* Thread-specific CPU-time clock.  */
+#define CLOCK_THREAD_CPUTIME_ID 3
+/* Monotonic system-wide clock, not adjusted for frequency scaling.  */
+#define CLOCK_MONOTONIC_RAW 4
+/* Identifier for system-wide realtime clock, updated only on ticks.  */
+#define CLOCK_REALTIME_COARSE 5
+/* Monotonic system-wide clock, updated only on ticks.  */
+#define CLOCK_MONOTONIC_COARSE 6
+/* Monotonic system-wide clock that includes time spent in suspension.  */
+#define CLOCK_BOOTTIME 7
+/* Like CLOCK_REALTIME but also wakes suspended system.  */
+#define CLOCK_REALTIME_ALARM 8
+/* Like CLOCK_BOOTTIME but also wakes suspended system.  */
+#define CLOCK_BOOTTIME_ALARM 9
+/* Like CLOCK_REALTIME but in International Atomic Time.  */
+#define CLOCK_TAI 11
+
+/* Flag to indicate time is absolute.  */
+#define TIMER_ABSTIME 1
+
+
+
+/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_TIMEX_H 1
+
+
+
+#define __timeval_defined 1
+
+
+
+/* A time value that is accurate to the nearest
+   microsecond but also has a range of years.  */
+struct timeval
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __suseconds_t tv_usec;	/* Microseconds.  */
+};
+
+/* These definitions from linux/timex.h as of 3.18.  */
+
+struct timex
+{
+  unsigned int modes;		/* mode selector */
+  __syscall_slong_t offset;	/* time offset (usec) */
+  __syscall_slong_t freq;	/* frequency offset (scaled ppm) */
+  __syscall_slong_t maxerror;	/* maximum error (usec) */
+  __syscall_slong_t esterror;	/* estimated error (usec) */
+  int status;			/* clock command/status */
+  __syscall_slong_t constant;	/* pll time constant */
+  __syscall_slong_t precision;	/* clock precision (usec) (ro) */
+  __syscall_slong_t tolerance;	/* clock frequency tolerance (ppm) (ro) */
+  struct timeval time;		/* (read only, except for ADJ_SETOFFSET) */
+  __syscall_slong_t tick;	/* (modified) usecs between clock ticks */
+  __syscall_slong_t ppsfreq;	/* pps frequency (scaled ppm) (ro) */
+  __syscall_slong_t jitter;	/* pps jitter (us) (ro) */
+  int shift;			/* interval duration (s) (shift) (ro) */
+  __syscall_slong_t stabil;	/* pps stability (scaled ppm) (ro) */
+  __syscall_slong_t jitcnt;	/* jitter limit exceeded (ro) */
+  __syscall_slong_t calcnt;	/* calibration intervals (ro) */
+  __syscall_slong_t errcnt;	/* calibration errors (ro) */
+  __syscall_slong_t stbcnt;	/* stability limit exceeded (ro) */
+
+  int tai;			/* TAI offset (ro) */
+
+  /* ??? */
+  int  :32; int  :32; int  :32; int  :32;
+  int  :32; int  :32; int  :32; int  :32;
+  int  :32; int  :32; int  :32;
+};
+
+/* Mode codes (timex.mode) */
+#define ADJ_OFFSET 0x0001
+#define ADJ_FREQUENCY 0x0002
+#define ADJ_MAXERROR 0x0004
+#define ADJ_ESTERROR 0x0008
+#define ADJ_STATUS 0x0010
+#define ADJ_TIMECONST 0x0020
+#define ADJ_TAI 0x0080
+#define ADJ_SETOFFSET 0x0100
+#define ADJ_MICRO 0x1000
+#define ADJ_NANO 0x2000
+#define ADJ_TICK 0x4000
+#define ADJ_OFFSET_SINGLESHOT 0x8001
+#define ADJ_OFFSET_SS_READ 0xa001
+
+/* xntp 3.4 compatibility names */
+#define MOD_OFFSET ADJ_OFFSET
+#define MOD_FREQUENCY ADJ_FREQUENCY
+#define MOD_MAXERROR ADJ_MAXERROR
+#define MOD_ESTERROR ADJ_ESTERROR
+#define MOD_STATUS ADJ_STATUS
+#define MOD_TIMECONST ADJ_TIMECONST
+#define MOD_CLKB ADJ_TICK
+#define MOD_CLKA ADJ_OFFSET_SINGLESHOT
+#define MOD_TAI ADJ_TAI
+#define MOD_MICRO ADJ_MICRO
+#define MOD_NANO ADJ_NANO
+
+
+/* Status codes (timex.status) */
+#define STA_PLL 0x0001
+#define STA_PPSFREQ 0x0002
+#define STA_PPSTIME 0x0004
+#define STA_FLL 0x0008
+
+#define STA_INS 0x0010
+#define STA_DEL 0x0020
+#define STA_UNSYNC 0x0040
+#define STA_FREQHOLD 0x0080
+
+#define STA_PPSSIGNAL 0x0100
+#define STA_PPSJITTER 0x0200
+#define STA_PPSWANDER 0x0400
+#define STA_PPSERROR 0x0800
+
+#define STA_CLOCKERR 0x1000
+#define STA_NANO 0x2000
+#define STA_MODE 0x4000
+#define STA_CLK 0x8000
+
+/* Read-only bits */
+#define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
+
+
+
+__BEGIN_DECLS
+
+/* Tune a POSIX clock.  */
+extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
+
+__END_DECLS
+
+
+
+/* Many of the typedefs and structs whose official home is this header
+   may also need to be defined by other headers.  */
+
+#define __clock_t_defined 1
+
+
+
+/* Returned by `clock'.  */
+typedef __clock_t clock_t;
+
+
+
+#define __struct_tm_defined 1
+
+
+
+/* ISO C `broken-down time' structure.  */
+struct tm
+{
+  int tm_sec;			/* Seconds.	[0-60] (1 leap second) */
+  int tm_min;			/* Minutes.	[0-59] */
+  int tm_hour;			/* Hours.	[0-23] */
+  int tm_mday;			/* Day.		[1-31] */
+  int tm_mon;			/* Month.	[0-11] */
+  int tm_year;			/* Year	- 1900.  */
+  int tm_wday;			/* Day of week.	[0-6] */
+  int tm_yday;			/* Days in year.[0-365]	*/
+  int tm_isdst;			/* DST.		[-1/0/1]*/
+
+
+  long int tm_gmtoff;		/* Seconds east of UTC.  */
+  const char *tm_zone;		/* Timezone abbreviation.  */
+
+
+
+
+};
+
+
+
+
+
+
+
+
+#define __clockid_t_defined 1
+
+
+
+/* Clock ID used in clock and timer functions.  */
+typedef __clockid_t clockid_t;
+
+
+#define __timer_t_defined 1
+
+
+
+/* Timer ID returned by `timer_create'.  */
+typedef __timer_t timer_t;
+
+
+#define __itimerspec_defined 1
+
+
+
+
+/* POSIX.1b structure for timer start values and intervals.  */
+struct itimerspec
+  {
+    struct timespec it_interval;
+    struct timespec it_value;
+  };
+
+struct sigevent;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* Time base values for timespec_get.  */
+#define TIME_UTC 1
+
+
+__BEGIN_DECLS
+
+/* Time used by the program so far (user time + system time).
+   The result / CLOCKS_PER_SEC is program time in seconds.  */
+extern clock_t clock (void) __THROW;
+
+/* Return the current time and put it in *TIMER if TIMER is not NULL.  */
+extern time_t time (time_t *__timer) __THROW;
+
+/* Return the difference between TIME1 and TIME0.  */
+extern double difftime (time_t __time1, time_t __time0)
+     __THROW __attribute__ ((__const__));
+
+/* Return the `time_t' representation of TP and normalize TP.  */
+extern time_t mktime (struct tm *__tp) __THROW;
+
+
+/* Format TP into S according to FORMAT.
+   Write no more than MAXSIZE characters and return the number
+   of characters written, or 0 if it would exceed MAXSIZE.  */
+extern size_t strftime (char *__restrict __s, size_t __maxsize,
+			const char *__restrict __format,
+			const struct tm *__restrict __tp) __THROW;
+
+
+/* Parse S according to FORMAT and store binary time information in TP.
+   The return value is a pointer to the first unparsed character in S.  */
+extern char *strptime (const char *__restrict __s,
+		       const char *__restrict __fmt, struct tm *__tp)
+     __THROW;
+
+
+
+/* Similar to the two functions above but take the information from
+   the provided locale and not the global locale.  */
+
+extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
+			  const char *__restrict __format,
+			  const struct tm *__restrict __tp,
+			  locale_t __loc) __THROW;
+
+
+
+extern char *strptime_l (const char *__restrict __s,
+			 const char *__restrict __fmt, struct tm *__tp,
+			 locale_t __loc) __THROW;
+
+
+
+/* Return the `struct tm' representation of *TIMER
+   in Universal Coordinated Time (aka Greenwich Mean Time).  */
+extern struct tm *gmtime (const time_t *__timer) __THROW;
+
+/* Return the `struct tm' representation
+   of *TIMER in the local timezone.  */
+extern struct tm *localtime (const time_t *__timer) __THROW;
+
+
+/* Return the `struct tm' representation of *TIMER in UTC,
+   using *TP to store the result.  */
+extern struct tm *gmtime_r (const time_t *__restrict __timer,
+			    struct tm *__restrict __tp) __THROW;
+
+/* Return the `struct tm' representation of *TIMER in local time,
+   using *TP to store the result.  */
+extern struct tm *localtime_r (const time_t *__restrict __timer,
+			       struct tm *__restrict __tp) __THROW;
+
+
+/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
+   that is the representation of TP in this format.  */
+extern char *asctime (const struct tm *__tp) __THROW;
+
+/* Equivalent to `asctime (localtime (timer))'.  */
+extern char *ctime (const time_t *__timer) __THROW;
+
+
+/* Reentrant versions of the above functions.  */
+
+/* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
+   that is the representation of TP in this format.  */
+extern char *asctime_r (const struct tm *__restrict __tp,
+			char *__restrict __buf) __THROW;
+
+/* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'.  */
+extern char *ctime_r (const time_t *__restrict __timer,
+		      char *__restrict __buf) __THROW;
+
+
+
+/* Defined in localtime.c.  */
+extern char *__tzname[2];	/* Current timezone names.  */
+extern int __daylight;		/* If daylight-saving time is ever in use.  */
+extern long int __timezone;	/* Seconds west of UTC.  */
+
+
+
+/* Same as above.  */
+extern char *tzname[2];
+
+/* Set time conversion information from the TZ environment variable.
+   If TZ is not defined, a locale-dependent default is used.  */
+extern void tzset (void) __THROW;
+
+
+
+extern int daylight;
+extern long int timezone;
+
+
+
+/* Set the system time to *WHEN.
+   This call is restricted to the superuser.  */
+extern int stime (const time_t *__when) __THROW;
+
+
+
+/* Nonzero if YEAR is a leap year (every 4 years,
+   except every 100th isn't, and every 400th is).  */
+#define __isleap(year) ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+
+
+
+
+/* Miscellaneous functions many Unices inherited from the public domain
+   localtime package.  These are included only for compatibility.  */
+
+/* Like `mktime', but for TP represents Universal Time, not local time.  */
+extern time_t timegm (struct tm *__tp) __THROW;
+
+/* Another name for `mktime'.  */
+extern time_t timelocal (struct tm *__tp) __THROW;
+
+/* Return the number of days in YEAR.  */
+extern int dysize (int __year) __THROW  __attribute__ ((__const__));
+
+
+
+
+/* Pause execution for a number of nanoseconds.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern int nanosleep (const struct timespec *__requested_time,
+		      struct timespec *__remaining);
+
+
+/* Get resolution of clock CLOCK_ID.  */
+extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
+
+/* Get current value of clock CLOCK_ID and store it in TP.  */
+extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
+
+/* Set clock CLOCK_ID to value TP.  */
+extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
+     __THROW;
+
+
+/* High-resolution sleep with the specified clock.
+
+   This function is a cancellation point and therefore not marked with
+   __THROW.  */
+extern int clock_nanosleep (clockid_t __clock_id, int __flags,
+			    const struct timespec *__req,
+			    struct timespec *__rem);
+
+/* Return clock ID for CPU-time clock.  */
+extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
+
+
+
+/* Create new per-process timer using CLOCK_ID.  */
+extern int timer_create (clockid_t __clock_id,
+			 struct sigevent *__restrict __evp,
+			 timer_t *__restrict __timerid) __THROW;
+
+/* Delete timer TIMERID.  */
+extern int timer_delete (timer_t __timerid) __THROW;
+
+/* Set timer TIMERID to VALUE, returning old value in OVALUE.  */
+extern int timer_settime (timer_t __timerid, int __flags,
+			  const struct itimerspec *__restrict __value,
+			  struct itimerspec *__restrict __ovalue) __THROW;
+
+/* Get current value of timer TIMERID and store it in VALUE.  */
+extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
+     __THROW;
+
+/* Get expiration overrun for timer TIMERID.  */
+extern int timer_getoverrun (timer_t __timerid) __THROW;
+
+
+
+
+/* Set TS to calendar time based in time base BASE.  */
+extern int timespec_get (struct timespec *__ts, int __base)
+     __THROW __nonnull ((1));
+
+
+
+
+/* Set to one of the following values to indicate an error.
+     1  the DATEMSK environment variable is null or undefined,
+     2  the template file cannot be opened for reading,
+     3  failed to get file status information,
+     4  the template file is not a regular file,
+     5  an error is encountered while reading the template file,
+     6  memory allication failed (not enough memory available),
+     7  there is no line in the template that matches the input,
+     8  invalid input specification Example: February 31 or a time is
+	specified that can not be represented in a time_t (representing
+	the time in seconds since 00:00:00 UTC, January 1, 1970) */
+extern int getdate_err;
+
+/* Parse the given string as a date specification and return a value
+   representing the value.  The templates from the file identified by
+   the environment variable DATEMSK are used.  In case of an error
+   `getdate_err' is set.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern struct tm *getdate (const char *__string);
+
+
+
+/* Since `getdate' is not reentrant because of the use of `getdate_err'
+   and the static buffer to return the result in, we provide a thread-safe
+   variant.  The functionality is the same.  The result is returned in
+   the buffer pointed to by RESBUFP and in case of an error the return
+   value is != 0 with the same values as given above for `getdate_err'.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern int getdate_r (const char *__restrict __string,
+		      struct tm *__restrict __resbufp);
+
+
+__END_DECLS
+
+
+/* Declaration of common pthread types for all architectures.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_PTHREADTYPES_COMMON_H 1
+
+/* For internal mutex and condition variable definitions.  */
+/* Common threading primitives definitions for both POSIX and C11.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _THREAD_SHARED_TYPES_H 1
+
+/* Arch-specific definitions.  Each architecture must define the following
+   macros to define the expected sizes of pthread data types:
+
+   __SIZEOF_PTHREAD_ATTR_T        - size of pthread_attr_t.
+   __SIZEOF_PTHREAD_MUTEX_T       - size of pthread_mutex_t.
+   __SIZEOF_PTHREAD_MUTEXATTR_T   - size of pthread_mutexattr_t.
+   __SIZEOF_PTHREAD_COND_T        - size of pthread_cond_t.
+   __SIZEOF_PTHREAD_CONDATTR_T    - size of pthread_condattr_t.
+   __SIZEOF_PTHREAD_RWLOCK_T      - size of pthread_rwlock_t.
+   __SIZEOF_PTHREAD_RWLOCKATTR_T  - size of pthread_rwlockattr_t.
+   __SIZEOF_PTHREAD_BARRIER_T     - size of pthread_barrier_t.
+   __SIZEOF_PTHREAD_BARRIERATTR_T - size of pthread_barrierattr_t.
+
+   Also, the following macros must be define for internal pthread_mutex_t
+   struct definitions (struct __pthread_mutex_s):
+
+   __PTHREAD_COMPAT_PADDING_MID   - any additional members after 'kind'
+				    and before '__spin' (for 64 bits) or
+				    '__nusers' (for 32 bits).
+   __PTHREAD_COMPAT_PADDING_END   - any additional members at the end of
+				    the internal structure.
+   __PTHREAD_MUTEX_LOCK_ELISION   - 1 if the architecture supports lock
+				    elision or 0 otherwise.
+   __PTHREAD_MUTEX_NUSERS_AFTER_KIND - control where to put __nusers.  The
+				       preferred value for new architectures
+				       is 0.
+   __PTHREAD_MUTEX_USE_UNION      - control whether internal __spins and
+				    __list will be place inside a union for
+				    linuxthreads compatibility.
+				    The preferred value for new architectures
+				    is 0.
+
+   For a new port the preferred values for the required defines are:
+
+   #define __PTHREAD_COMPAT_PADDING_MID
+   #define __PTHREAD_COMPAT_PADDING_END
+   #define __PTHREAD_MUTEX_LOCK_ELISION         0
+   #define __PTHREAD_MUTEX_NUSERS_AFTER_KIND    0
+   #define __PTHREAD_MUTEX_USE_UNION            0
+
+   __PTHREAD_MUTEX_LOCK_ELISION can be set to 1 if the hardware plans to
+   eventually support lock elision using transactional memory.
+
+   The additional macro defines any constraint for the lock alignment
+   inside the thread structures:
+
+   __LOCK_ALIGNMENT - for internal lock/futex usage.
+
+   Same idea but for the once locking primitive:
+
+   __ONCE_ALIGNMENT - for pthread_once_t/once_flag definition.
+
+   And finally the internal pthread_rwlock_t (struct __pthread_rwlock_arch_t)
+   must be defined.
+ */
+/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#define _BITS_PTHREADTYPES_ARCH_H 1
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+
+
+
+#define __SIZEOF_PTHREAD_MUTEX_T 40
+#define __SIZEOF_PTHREAD_ATTR_T 56
+#define __SIZEOF_PTHREAD_MUTEX_T 40
+#define __SIZEOF_PTHREAD_RWLOCK_T 56
+#define __SIZEOF_PTHREAD_BARRIER_T 32
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#define __SIZEOF_PTHREAD_MUTEXATTR_T 4
+#define __SIZEOF_PTHREAD_COND_T 48
+#define __SIZEOF_PTHREAD_CONDATTR_T 4
+#define __SIZEOF_PTHREAD_RWLOCKATTR_T 8
+#define __SIZEOF_PTHREAD_BARRIERATTR_T 4
+
+/* Definitions for internal mutex struct.  */
+#define __PTHREAD_COMPAT_PADDING_MID 
+#define __PTHREAD_COMPAT_PADDING_END 
+#define __PTHREAD_MUTEX_LOCK_ELISION 1
+
+#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
+#define __PTHREAD_MUTEX_USE_UNION 0
+
+
+
+
+
+#define __LOCK_ALIGNMENT 
+#define __ONCE_ALIGNMENT 
+
+struct __pthread_rwlock_arch_t
+{
+  unsigned int __readers;
+  unsigned int __writers;
+  unsigned int __wrphase_futex;
+  unsigned int __writers_futex;
+  unsigned int __pad3;
+  unsigned int __pad4;
+
+  int __cur_writer;
+  int __shared;
+  signed char __rwelision;
+
+
+
+
+  unsigned char __pad1[7];
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 }
+
+  unsigned long int __pad2;
+  /* FLAGS must stay at this position in the structure to maintain
+     binary compatibility.  */
+  unsigned int __flags;
+#define __PTHREAD_RWLOCK_INT_FLAGS_SHARED 1
+};
+
+
+
+
+
+
+
+/* Common definition of pthread_mutex_t. */
+
+
+typedef struct __pthread_internal_list
+{
+  struct __pthread_internal_list *__prev;
+  struct __pthread_internal_list *__next;
+} __pthread_list_t;
+
+
+
+
+
+
+
+/* Lock elision support.  */
+
+
+#define __PTHREAD_SPINS_DATA short __spins; short __elision
+
+
+#define __PTHREAD_SPINS 0, 0
+
+
+
+
+
+
+struct __pthread_mutex_s
+{
+  int __lock __LOCK_ALIGNMENT;
+  unsigned int __count;
+  int __owner;
+
+  unsigned int __nusers;
+
+  /* KIND must stay at this position in the structure to maintain
+     binary compatibility with static initializers.
+
+     Concurrency notes:
+     The __kind of a mutex is initialized either by the static
+     PTHREAD_MUTEX_INITIALIZER or by a call to pthread_mutex_init.
+
+     After a mutex has been initialized, the __kind of a mutex is usually not
+     changed.  BUT it can be set to -1 in pthread_mutex_destroy or elision can
+     be enabled.  This is done concurrently in the pthread_mutex_*lock functions
+     by using the macro FORCE_ELISION. This macro is only defined for
+     architectures which supports lock elision.
+
+     For elision, there are the flags PTHREAD_MUTEX_ELISION_NP and
+     PTHREAD_MUTEX_NO_ELISION_NP which can be set in addition to the already set
+     type of a mutex.
+     Before a mutex is initialized, only PTHREAD_MUTEX_NO_ELISION_NP can be set
+     with pthread_mutexattr_settype.
+     After a mutex has been initialized, the functions pthread_mutex_*lock can
+     enable elision - if the mutex-type and the machine supports it - by setting
+     the flag PTHREAD_MUTEX_ELISION_NP. This is done concurrently. Afterwards
+     the lock / unlock functions are using specific elision code-paths.  */
+  int __kind;
+  __PTHREAD_COMPAT_PADDING_MID
+
+
+
+
+  __PTHREAD_SPINS_DATA;
+  __pthread_list_t __list;
+#define __PTHREAD_MUTEX_HAVE_PREV 1
+  __PTHREAD_COMPAT_PADDING_END
+};
+
+
+/* Common definition of pthread_cond_t. */
+
+struct __pthread_cond_s
+{
+  __extension__ union
+  {
+    __extension__ unsigned long long int __wseq;
+    struct
+    {
+      unsigned int __low;
+      unsigned int __high;
+    } __wseq32;
+  };
+  __extension__ union
+  {
+    __extension__ unsigned long long int __g1_start;
+    struct
+    {
+      unsigned int __low;
+      unsigned int __high;
+    } __g1_start32;
+  };
+  unsigned int __g_refs[2] __LOCK_ALIGNMENT;
+  unsigned int __g_size[2];
+  unsigned int __g1_orig_size;
+  unsigned int __wrefs;
+  unsigned int __g_signals[2];
+};
+
+
+/* Thread identifiers.  The structure of the attribute type is not
+   exposed on purpose.  */
+typedef unsigned long int pthread_t;
+
+
+/* Data structures for mutex handling.  The structure of the attribute
+   type is not exposed on purpose.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
+  int __align;
+} pthread_mutexattr_t;
+
+
+/* Data structure for condition variable handling.  The structure of
+   the attribute type is not exposed on purpose.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_CONDATTR_T];
+  int __align;
+} pthread_condattr_t;
+
+
+/* Keys for thread-specific data */
+typedef unsigned int pthread_key_t;
+
+
+/* Once-only execution */
+typedef int __ONCE_ALIGNMENT pthread_once_t;
+
+
+union pthread_attr_t
+{
+  char __size[__SIZEOF_PTHREAD_ATTR_T];
+  long int __align;
+};
+
+typedef union pthread_attr_t pthread_attr_t;
+#define __have_pthread_attr_t 1
+
+
+
+typedef union
+{
+  struct __pthread_mutex_s __data;
+  char __size[__SIZEOF_PTHREAD_MUTEX_T];
+  long int __align;
+} pthread_mutex_t;
+
+
+typedef union
+{
+  struct __pthread_cond_s __data;
+  char __size[__SIZEOF_PTHREAD_COND_T];
+  __extension__ long long int __align;
+} pthread_cond_t;
+
+
+
+/* Data structure for reader-writer lock variable handling.  The
+   structure of the attribute type is deliberately not exposed.  */
+typedef union
+{
+  struct __pthread_rwlock_arch_t __data;
+  char __size[__SIZEOF_PTHREAD_RWLOCK_T];
+  long int __align;
+} pthread_rwlock_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
+  long int __align;
+} pthread_rwlockattr_t;
+
+
+
+
+/* POSIX spinlock data type.  */
+typedef volatile int pthread_spinlock_t;
+
+
+/* POSIX barriers data type.  The structure of the type is
+   deliberately not exposed.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIER_T];
+  long int __align;
+} pthread_barrier_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIERATTR_T];
+  int __align;
+} pthread_barrierattr_t;
+
+
+/* Copyright (C) 2001-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Define the machine-dependent type `jmp_buf'.  x86-64 version.  */
+
+#define _BITS_SETJMP_H 1
+
+
+
+
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+
+
+
+
+typedef long int __jmp_buf[8];
+
+
+
+
+
+
+
+
+/* Determine the wordsize from the preprocessor defines.  */
+
+
+#define __WORDSIZE 64
+
+
+
+
+
+
+
+#define __WORDSIZE_TIME64_COMPAT32 1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+#define __SYSCALL_WORDSIZE 64
+
+
+
+/* Detach state.  */
+enum
+{
+  PTHREAD_CREATE_JOINABLE,
+#define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE
+  PTHREAD_CREATE_DETACHED
+#define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED
+};
+
+
+/* Mutex types.  */
+enum
+{
+  PTHREAD_MUTEX_TIMED_NP,
+  PTHREAD_MUTEX_RECURSIVE_NP,
+  PTHREAD_MUTEX_ERRORCHECK_NP,
+  PTHREAD_MUTEX_ADAPTIVE_NP
+
+  ,
+  PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP,
+  PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP,
+  PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP,
+  PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL
+
+
+  /* For compatibility.  */
+  , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_TIMED_NP
+
+};
+
+
+
+/* Robust mutex or not flags.  */
+enum
+{
+  PTHREAD_MUTEX_STALLED,
+  PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED,
+  PTHREAD_MUTEX_ROBUST,
+  PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST
+};
+
+
+
+
+/* Mutex protocols.  */
+enum
+{
+  PTHREAD_PRIO_NONE,
+  PTHREAD_PRIO_INHERIT,
+  PTHREAD_PRIO_PROTECT
+};
+
+
+
+
+#define PTHREAD_MUTEX_INITIALIZER { { 0, 0, 0, 0, 0, __PTHREAD_SPINS, { 0, 0 } } }
+
+
+#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP { { 0, 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, __PTHREAD_SPINS, { 0, 0 } } }
+
+#define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP { { 0, 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, __PTHREAD_SPINS, { 0, 0 } } }
+
+#define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP { { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, __PTHREAD_SPINS, { 0, 0 } } }
+
+
+
+
+
+/* Read-write lock types.  */
+
+enum
+{
+  PTHREAD_RWLOCK_PREFER_READER_NP,
+  PTHREAD_RWLOCK_PREFER_WRITER_NP,
+  PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,
+  PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP
+};
+
+/* Define __PTHREAD_RWLOCK_INT_FLAGS_SHARED to 1 if pthread_rwlock_t
+   has the shared field.  All 64-bit architectures have the shared field
+   in pthread_rwlock_t.  */
+
+
+
+
+
+
+/* Read-write lock initializers.  */
+#define PTHREAD_RWLOCK_INITIALIZER { { 0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, 0 } }
+
+
+
+#define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP { { 0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP } }
+
+
+
+
+
+
+/* Scheduler inheritance.  */
+enum
+{
+  PTHREAD_INHERIT_SCHED,
+#define PTHREAD_INHERIT_SCHED PTHREAD_INHERIT_SCHED
+  PTHREAD_EXPLICIT_SCHED
+#define PTHREAD_EXPLICIT_SCHED PTHREAD_EXPLICIT_SCHED
+};
+
+
+/* Scope handling.  */
+enum
+{
+  PTHREAD_SCOPE_SYSTEM,
+#define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_SYSTEM
+  PTHREAD_SCOPE_PROCESS
+#define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_PROCESS
+};
+
+
+/* Process shared or private flag.  */
+enum
+{
+  PTHREAD_PROCESS_PRIVATE,
+#define PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_PRIVATE
+  PTHREAD_PROCESS_SHARED
+#define PTHREAD_PROCESS_SHARED PTHREAD_PROCESS_SHARED
+};
+
+
+
+/* Conditional variable handling.  */
+#define PTHREAD_COND_INITIALIZER { { {0}, {0}, {0, 0}, {0, 0}, 0, 0, {0, 0} } }
+
+
+/* Cleanup buffers */
+struct _pthread_cleanup_buffer
+{
+  void (*__routine) (void *);             /* Function to call.  */
+  void *__arg;                            /* Its argument.  */
+  int __canceltype;                       /* Saved cancellation type. */
+  struct _pthread_cleanup_buffer *__prev; /* Chaining of cleanup functions.  */
+};
+
+
+
+#pragma GCC visibility pop
+
+import  "./pr99023_a.H";
+
+
+
+namespace std _GLIBCXX_VISIBILITY2(default)
+{
+} // namespace
+