libstdc++-v3/ChangeLog

   1 2020-04-22  Jonathan Wakely  <jwakely@redhat.com>
   2
   3         * include/bits/stl_map.h (__cpp_lib_map_insertion): Remove old
   4         macro.
   5         * include/bits/unordered_map.h (__cpp_lib_unordered_map_insertion):
   6         Likewise.
   7         * include/std/version (__cpp_lib_map_insertion)
   8         (__cpp_lib_unordered_map_insertion): Remove.
   9
  10         * include/std/condition_variable (__cpp_lib_jthread): Remove
  11         redundant definition.
  12         * include/std/stop_token (__cpp_lib_jthread): Update macro value to
  13         indicate P1869R1 support.
  14         * include/std/version (__cpp_lib_jthread): Update value.
  15         * testsuite/30_threads/condition_variable_any/stop_token/1.cc: Check
  16         for updated macro value.
  17         * testsuite/30_threads/condition_variable_any/stop_token/2.cc:
  18         Likewise.
  19         * testsuite/30_threads/jthread/1.cc: Likewise.
  20         * testsuite/30_threads/jthread/2.cc: Likewise.
  21         * testsuite/30_threads/stop_token/1.cc: Likewise.
  22         * testsuite/30_threads/stop_token/2.cc: Likewise.
  23
  24         * testsuite/21_strings/basic_string/erasure.cc: Check for
  25         __cpp_lib_erase_if macro.
  26         * testsuite/23_containers/deque/erasure.cc: Add header name to #error
  27         messages.
  28         * testsuite/23_containers/forward_list/erasure.cc: Likewise.
  29         * testsuite/23_containers/list/erasure.cc: Likewise.
  30         * testsuite/23_containers/map/erasure.cc: Likewise.
  31         * testsuite/23_containers/set/erasure.cc: Likewise.
  32         * testsuite/23_containers/unordered_map/erasure.cc: Likewise.
  33         * testsuite/23_containers/unordered_set/erasure.cc: Likewise.
  34         * testsuite/23_containers/vector/erasure.cc: Likewise.
  35
  36 2020-04-21  Jonathan Wakely  <jwakely@redhat.com>
  37
  38         * include/bits/stl_iterator.h (__normal_iterator): Use synth-three-way
  39         to define operator<=>.
  40         * testsuite/24_iterators/normal_iterator/cmp_c++20.cc: New test.
  41
  42         * doc/Makefile.am (xml_sources_manual): Add missing XML files.
  43         * doc/Makefile.in: Regenerate.
  44         * doc/xml/manual/status_cxx1998.xml: Refer to "this section" instead
  45         of "this page".
  46         * doc/xml/manual/status_cxx2011.xml: Formatting and other corrections
  47         to the C++11 status table.
  48         * doc/xml/manual/status_cxx2014.xml: Replace list of C++14 feature
  49         proposals with table matching contents of the C++14 standard.
  50         * doc/xml/manual/status_cxx2017.xml: Add table matching contents of
  51         the C++17 standard.
  52         * doc/html/*: Regenerate.
  53
  54         PR c++/94149
  55         * include/std/type_traits (__is_nt_constructible_impl): Add partial
  56         specializations for bounded arrays with non-empty initializers.
  57         * testsuite/20_util/is_nothrow_constructible/value_c++20.cc: New test.
  58
  59 2020-04-20  Thomas Rodgers  <trodgers@redhat.com>
  60
  61         * testsuite/lib/libstdc++.exp: Add additional_flags=
  62         -DTBB_SUPRESS_DEPRECATED_MESSAGES=1 to suppress warnings when
  63         compiling with a newer Thread Building Blocks.
  64
  65 2020-04-20  Jonathan Wakely  <jwakely@redhat.com>
  66
  67         * testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.
  68
  69         * testsuite/20_util/is_constructible/51185.cc: Make test class a
  70         non-aggregate so that the test verifies the same thing in all -std
  71         modes.
  72         * testsuite/20_util/is_constructible/value-2.cc: Adjust expected
  73         results for some types when paren-init for aggregates is supported.
  74
  75         * include/std/version (__cpp_lib_three_way_comparison): Update value.
  76         * libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.
  77         (__detail::__synth3way): Add noexcept-specifier.
  78
  79         * include/bits/stl_map.h (map): Define operator<=> and remove
  80         operator< for C++20.
  81         * include/bits/stl_multimap.h (multimap): Likewise.
  82         * include/bits/stl_multiset.h (multiset): Likewise.
  83         * include/bits/stl_set.h (set): Likewise.
  84         * include/bits/stl_tree.h (_Rb_tree): Likewise.
  85         (_Rb_tree_iterator, _Rb_tree_const_iterator): Remove redundant
  86         operator!= for C++20.
  87         * include/debug/map.h (__gnu_debug::map): Define operator<=> for C++20.
  88         * include/debug/multimap.h (__gnu_debug::multimap): Likewise.
  89         * include/debug/multiset.h (__gnu_debug::multiset): Likewise.
  90         * include/debug/set.h (__gnu_debug::set): Likewise.
  91         * testsuite/23_containers/map/operators/cmp_c++20.cc: New test.
  92         * testsuite/23_containers/multimap/operators/cmp_c++20.cc: New test.
  93         * testsuite/23_containers/multiset/operators/cmp_c++20.cc: New test.
  94         * testsuite/23_containers/set/operators/cmp_c++20.cc: New test.
  95
  96 2020-04-20  Matthias Kretz  <kretz@kde.org>
  97
  98         * testsuite/lib/libstdc++.exp: Avoid illegal argument to verbose.
  99
 100 2020-04-19  Jonathan Wakely  <jwakely@redhat.com>
 101
 102         * include/bits/stl_queue.h (queue): Define operator<=> for C++20.
 103         * include/bits/stl_stack.h (stack): Likewise.
 104         * testsuite/23_containers/queue/cmp_c++20.cc: New test.
 105         * testsuite/23_containers/stack/cmp_c++20.cc: New test.
 106
 107         * include/bits/unordered_map.h (unordered_map, unordered_multimap):
 108         Remove redundant operator!= for C++20.
 109         * include/bits/unordered_set.h (unordered_set, unordered_multiset):
 110         Likewise.
 111         * include/debug/unordered_map (unordered_map, unordered_multimap):
 112         Likewise.
 113         * include/debug/unordered_set (unordered_set, unordered_multiset):
 114         Likewise.
 115
 116         PR other/94629
 117         * include/debug/formatter.h (_Error_formatter::_Parameter): Fix
 118         redundant assignment in constructor.
 119
 120 2020-04-18  Jonathan Wakely  <jwakely@redhat.com>
 121
 122         * include/std/chrono (duration, time_point): Define operator<=> and
 123         remove redundant operator!= for C++20.
 124         * testsuite/20_util/duration/comparison_operators/three_way.cc: New
 125         test.
 126         * testsuite/20_util/time_point/comparison_operators/three_way.cc: New
 127         test.
 128
 129         * testsuite/util/native_type/native_priority_queue.hpp: Use
 130         allocator_traits to rebind allocator.
 131
 132 2020-04-17  Jonathan Wakely  <jwakely@redhat.com>
 133
 134         * include/bits/forward_list.h (forward_list): Define operator<=> and
 135         remove redundant comparison operators for C++20.
 136         * include/bits/stl_bvector.h (vector<bool, Alloc>): Likewise.
 137         * include/bits/stl_deque.h (deque): Likewise.
 138         * include/bits/stl_iterator.h (__normal_iterator): Likewise.
 139         * include/bits/stl_list.h (list): Likewise.
 140         * include/bits/stl_vector.h (vector): Likewise.
 141         * include/debug/deque (__gnu_debug::deque): Likewise.
 142         * include/debug/forward_list (__gnu_debug::forward_list): Likewise.
 143         * include/debug/list (__gnu_debug::list): Likewise.
 144         * include/debug/safe_iterator.h (__gnu_debug::_Safe_iterator):
 145         Likewise.
 146         * include/debug/vector (__gnu_debug::vector): Likewise.
 147         * include/ext/pointer.h (__gnu_cxx::_Pointer_adapter): Define
 148         operator<=> for C++20.
 149         * testsuite/23_containers/deque/operators/cmp_c++20.cc: New test.
 150         * testsuite/23_containers/forward_list/cmp_c++20.cc: New test.
 151         * testsuite/23_containers/list/cmp_c++20.cc: New test.
 152         * testsuite/23_containers/vector/bool/cmp_c++20.cc: New test.
 153         * testsuite/23_containers/vector/cmp_c++20.cc: New test.
 154
 155         * include/bits/basic_string.h (basic_string): Define operator<=> and
 156         remove redundant comparison operators for C++20.
 157         * include/bits/char_traits.h (__gnu_cxx::char_traits, char_traits):
 158         Add comparison_category members.
 159         (__detail::__char_traits_cmp_cat): New helper to get comparison
 160         category from char traits class.
 161         * include/bits/regex.h (regex_traits::_RegexMask::operator!=): Do not
 162         define for C++20.
 163         (sub_match): Define operator<=> and remove redundant comparison
 164         operators for C++20.
 165         (match_results): Remove redundant operator!= for C++20.
 166         * include/std/string_view (basic_string_view): Define operator<=> and
 167         remove redundant comparison operators for C++20.
 168         * testsuite/21_strings/basic_string/operators/char/cmp_c++20.cc: New
 169         test.
 170         * testsuite/21_strings/basic_string/operators/wchar_t/cmp_c++20.cc:
 171         New test.
 172         * testsuite/21_strings/basic_string_view/operations/copy/char/
 173         constexpr.cc: Initialize variable.
 174         * testsuite/21_strings/basic_string_view/operations/copy/wchar_t/
 175         constexpr.cc: Likewise.
 176         * testsuite/21_strings/basic_string_view/operators/char/2.cc: Add
 177         dg-do directive and remove comments showing incorrect signatures.
 178         * testsuite/21_strings/basic_string_view/operators/wchar_t/2.cc:
 179         Likewise.
 180         * testsuite/21_strings/basic_string_view/operators/char/cmp_c++20.cc:
 181         New test.
 182         * testsuite/21_strings/basic_string_view/operators/wchar_t/cmp_c++20.cc:
 183         New test.
 184         * testsuite/28_regex/sub_match/compare_c++20.cc: New test.
 185
 186 2020-04-16  Jonathan Wakely  <jwakely@redhat.com>
 187
 188         * testsuite/20_util/unsynchronized_pool_resource/allocate.cc: Remove
 189         name of unused parameter.
 190
 191 2020-04-15  Jonathan Wakely  <jwakely@redhat.com>
 192
 193         * include/bits/fs_dir.h (file_status): Define operator== for C++20.
 194         (directory_entry): Define operator<=> and remove redundant comparison
 195         operators for C++20.
 196         * include/bits/fs_fwd.h (space_info): Define operator== for C++20.
 197         * include/bits/fs_path.h (path): Define operator<=> and remove
 198         redundant comparison operators for C++20.
 199         * testsuite/27_io/filesystem/path/compare/compare.cc: Fix comment.
 200         * testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
 201         * testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
 202         * testsuite/27_io/filesystem/path/compare/strings.cc: Likewise.
 203
 204         * include/bits/allocator.h (operator!=): Do not define for C++20.
 205         * include/bits/locale_classes.h (operator!=): Likewise.
 206         * include/bits/std_function.h (operator==(nullptr_t, const function&))
 207         (operator!=(const function&, nullptr_t))
 208         (operator!=(nullptr_t, const function&)): Likewise.
 209         * include/ext/bitmap_allocator.h (operator!=): Likewise.
 210         * include/ext/debug_allocator.h (operator!=): Likewise.
 211         * include/ext/extptr_allocator.h (operator!=): Likewise.
 212         * include/ext/malloc_allocator.h (operator!=): Likewise.
 213         * include/ext/mt_allocator.h (operator!=): Likewise.
 214         * include/ext/new_allocator.h (operator!=): Likewise.
 215         * include/ext/pool_allocator.h (operator!=): Likewise.
 216         * include/ext/throw_allocator.h (operator!=): Likewise.
 217         * include/std/bitset (bitset::operator!=): Likewise.
 218         * include/std/memory_resource (operator!=): Likewise.
 219         * include/std/scoped_allocator (operator!=): Likewise.
 220
 221         * include/std/typeindex (operator<=>): Define for C++20.
 222         * testsuite/20_util/typeindex/comparison_operators_c++20.cc: New test.
 223
 224 2020-04-14  Jonathan Wakely  <jwakely@redhat.com>
 225
 226         * libsupc++/compare (compare_three_way): Fix constraint so that
 227         BUILTIN-PTR-THREE-WAY does not require three_way_comparable_with.
 228         * testsuite/18_support/comparisons/object/builtin-ptr-three-way.cc:
 229         New test.
 230
 231         PR libstdc++/94562
 232         * include/bits/shared_ptr.h (operator<=>): Define for C++20.
 233         * include/bits/shared_ptr_base.h (operator<=>): Likewise.
 234         * include/bits/unique_ptr.h (operator<=>): Add inline specifier.
 235         * testsuite/20_util/shared_ptr/comparison/cmp_c++20.cc: New test.
 236         * testsuite/20_util/shared_ptr/comparison/less.cc: Do not expect
 237         std::less<A*> to be used when comparing std::shared_ptr<A> objects in
 238         C++20.
 239
 240         PR libstdc++/94565
 241         * libsupc++/compare (__unspec): Add noexcept-specifier to constructor.
 242         * testsuite/18_support/comparisons/categories/94565.cc: New test.
 243
 244 2020-04-13  Iain Sandoe  <iain@sandoe.co.uk>
 245
 246         * include/std/coroutine: Update coroutines builtin define,
 247         per n4861.
 248
 249 2020-04-09  Jonathan Wakely  <jwakely@redhat.com>
 250
 251         * libsupc++/compare (compare_three_way): Fix noexcept-specifier.
 252         (strong_order, weak_order, partial_order): Replace uses of <=> with
 253         compare_three_way function object (LWG 3324).
 254         * testsuite/18_support/comparisons/algorithms/partial_order.cc: Add
 255         equality operator so that X satisfies three_way_comparable.
 256         * testsuite/18_support/comparisons/algorithms/strong_order.cc:
 257         Likewise.
 258         * testsuite/18_support/comparisons/algorithms/weak_order.cc: Likewise.
 259
 260         * include/bits/unique_ptr.h (operator<=>): Define for C++20.
 261         * testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
 262         * testsuite/20_util/default_delete/void_neg.cc: Likewise.
 263         * testsuite/20_util/unique_ptr/comparison/compare.cc: New test.
 264         * testsuite/20_util/unique_ptr/comparison/compare_c++20.cc: New test.
 265
 266 2020-04-08  Jonathan Wakely  <jwakely@redhat.com>
 267
 268         * include/bits/slice_array.h (operator==(const slice&, const slice&)):
 269         Define for C++20.
 270         * include/std/complex (operator==(const T&, const complex<T>&))
 271         (operator!=(const complex<T>&, const complex<T>&))
 272         (operator!=(const complex<T>&, const T&))
 273         (operator!=(const T&, const complex<T>&)): Do not declare for C++20.
 274         * testsuite/26_numerics/slice/compare.cc: New test.
 275
 276         * include/std/charconv (to_chars_result, from_chars_result): Add
 277         defaulted equality comparisons for C++20.
 278         * testsuite/20_util/from_chars/compare.cc: New test.
 279         * testsuite/20_util/to_chars/compare.cc: New test.
 280
 281 2020-04-07  Jonathan Wakely  <jwakely@redhat.com>
 282
 283         PR libstdc++/94520
 284         * include/std/charconv (__integer_to_chars_result_type)
 285         (__integer_from_chars_result_type): Use __or_ instead of __or_v_ to
 286         allow use in C++14.
 287         * testsuite/20_util/from_chars/1.cc: Run test as C++14 and replace
 288         use of std::string_view with std::string.
 289         * testsuite/20_util/from_chars/2.cc: Likewise.
 290         * testsuite/20_util/to_chars/1.cc: Likewise.
 291         * testsuite/20_util/to_chars/2.cc: Likewise.
 292
 293 2020-04-06  Jonathan Wakely  <jwakely@redhat.com>
 294
 295         PR libstdc++/94498
 296         * include/bits/char_traits.h (__gnu_cxx::char_traits::move): Make it
 297         usable in constant expressions for C++20.
 298         (__gnu_cxx::char_traits::copy, __gnu_cxx::char_traits::assign): Add
 299         _GLIBCXX20_CONSTEXPR.
 300         (std::char_traits<char>, std::char_traits<wchar_t>)
 301         (std::char_traits<char8_t>): Make move, copy and assign usable in
 302         constant expressions for C++20.
 303         (std::char_traits<char16_t>, std::char_traits<char32_t>): Make move
 304         and copy usable in constant expressions for C++20.
 305         * include/std/string_view (basic_string_view::copy): Add
 306         _GLIBCXX20_CONSTEXPR.
 307         * testsuite/21_strings/basic_string_view/operations/copy/char/
 308         constexpr.cc: New test.
 309         * testsuite/21_strings/basic_string_view/operations/copy/wchar_t/
 310         constexpr.cc: New test.
 311
 312 2020-04-05  Gerald Pfeifer  <gerald@pfeifer.com>
 313
 314         * doc/xml/manual/appendix_contributing.xml: Refer to Git
 315         documentation instead of Subversion.  Switch to https.
 316         * doc/html/manual/appendix_contributing.html: Regenerate.
 317
 318 2020-04-03  Jonathan Wakely  <jwakely@redhat.com>
 319
 320         PR libstdc++/93960
 321         * include/bits/ptr_traits.h (__to_address): Add special case for debug
 322         iterators, to avoid dereferenceable check.
 323         * testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line number.
 324         * testsuite/20_util/to_address/debug.cc: New test.
 325
 326 2020-04-01  Andrea Corallo  <andrea.corallo@arm.com>
 327
 328         * testsuite/experimental/net/execution_context/use_service.cc:
 329         Require pthread and gthreads.
 330
 331 2020-04-01  Gerald Pfeifer  <gerald@pfeifer.com>
 332
 333         * doc/xml/manual/appendix_free.xml: Move "free books" list from
 334         fsf.org to gnu.org.
 335         * doc/html/manual/appendix_free.html: Regenerate.
 336
 337 2020-03-31  Ville Voutilainen  <ville.voutilainen@gmail.com>
 338
 339         Library-side tests for parenthesized aggregate init
 340
 341         PR c++/92878
 342         PR c++/92947
 343
 344         * testsuite/20_util/allocator_traits/members/92878_92947.cc: New.
 345         * testsuite/20_util/any/assign/92878_92947.cc: Likewise.
 346         * testsuite/20_util/any/cons/92878_92947.cc: Likewise.
 347         * testsuite/20_util/is_constructible/92878_92947.cc: Likewise.
 348         * testsuite/20_util/optional/assignment/92878_92947.cc: Likewise.
 349         * testsuite/20_util/optional/cons/92878_92947.cc: Likewise.
 350         * testsuite/20_util/pair/cons/92878_92947.cc: Likewise.
 351         * testsuite/20_util/shared_ptr/creation/92878_92947.cc: Likewise.
 352         * testsuite/20_util/specialized_algorithms/construct_at/92878_92947.cc:
 353         Likewise.
 354         * testsuite/20_util/unique_ptr/creation/92878_92947.cc: Likewise.
 355         * testsuite/20_util/uses_allocator/92878_92947.cc: Likewise.
 356         * testsuite/20_util/variant/92878_92947.cc: Likewise.
 357         * testsuite/23_containers/deque/modifiers/emplace/92878_92947.cc:
 358         Likewise.
 359         * testsuite/23_containers/forward_list/modifiers/92878_92947.cc:
 360         Likewise.
 361         * testsuite/23_containers/list/modifiers/emplace/92878_92947.cc:
 362         Likewise.
 363         * testsuite/23_containers/map/modifiers/emplace/92878_92947.cc:
 364         Likewise.
 365         * testsuite/23_containers/multimap/modifiers/emplace/92878_92947.cc:
 366         Likewise.
 367         * testsuite/23_containers/multiset/modifiers/emplace/92878_92947.cc:
 368         Likewise.
 369         * testsuite/23_containers/priority_queue/92878_92947.cc: Likewise.
 370         * testsuite/23_containers/queue/92878_92947.cc: Likewise.
 371         * testsuite/23_containers/set/modifiers/emplace/92878_92947.cc:
 372         Likewise.
 373         * testsuite/23_containers/stack/92878_92947.cc: Likewise.
 374         * testsuite/23_containers/unordered_map/modifiers/92878_92947.cc:
 375         Likewise.
 376         * testsuite/23_containers/unordered_multimap/modifiers/92878_92947.cc:
 377         Likewise.
 378         * testsuite/23_containers/unordered_multiset/modifiers/92878_92947.cc:
 379         Likewise.
 380         * testsuite/23_containers/unordered_set/modifiers/92878_92947.cc:
 381         Likewise.
 382         * testsuite/23_containers/vector/modifiers/emplace/92878_92947.cc:
 383         Likewise.
 384
 385 2020-03-28  Jonathan Wakely  <jwakely@redhat.com>
 386
 387         * testsuite/20_util/is_constructible/value-2.cc: Fix test to account
 388         for changes due to parenthesized aggregate-initialization in C++20.
 389         * testsuite/20_util/time_point/cons/81468.cc: Fix test to not clash
 390         with std::chrono::sys_time in C++20.
 391
 392         * include/bits/stl_iterator.h (reverse_iterator): Use requires-clause
 393         to constrain C++20 versions of comparison operators. Fix backwards
 394         logic of relational operators.
 395         (move_iterator): Use requires-clause to constrain comparison operators
 396         in C++20. Do not declare non-standard same-type overloads for C++20.
 397         * testsuite/24_iterators/move_iterator/rel_ops_c++20.cc: Check result
 398         of comparisons and check using greedy_ops type.
 399         * testsuite/24_iterators/reverse_iterator/rel_ops_c++20.cc: Likewise.
 400         * testsuite/24_iterators/move_iterator/greedy_ops.cc: Remove redundant
 401         main function from compile-only test.
 402         * testsuite/24_iterators/reverse_iterator/greedy_ops.cc: Likewise.
 403
 404 2020-03-27  Jonathan Wakely  <jwakely@redhat.com>
 405
 406         * include/bits/range_cmp.h (__cpp_lib_ranges): Define.
 407         * include/bits/stl_iterator.h: Check value of __cpp_concepts so that
 408         C++20 concepts are required.
 409         * include/bits/stl_iterator_base_types.h: Likewise.
 410         * include/std/concepts: Likewise.
 411         * include/std/version: Likewise.
 412         * testsuite/std/ranges/headers/ranges/synopsis.cc: Check feature test
 413         macro.
 414
 415         * include/bits/stl_iterator.h (reverse_iterator::iterator_concept)
 416         (reverse_iterator::iterator_category): Define for C++20.
 417         (reverse_iterator): Define comparison operators correctly for C++20.
 418         (__normal_iterator): Add constraints to comparison operators for C++20.
 419         (move_iterator::operator++(int)) [__cpp_lib_concepts]: Define new
 420         overload for input iterators.
 421         (move_iterator): Add constraints to comparison operators for C++20.
 422         Define operator<=> for C++20.
 423         * testsuite/24_iterators/move_iterator/input_iterator.cc: New test.
 424         * testsuite/24_iterators/move_iterator/move_only.cc: New test.
 425         * testsuite/24_iterators/move_iterator/rel_ops_c++20.cc: New test.
 426         * testsuite/24_iterators/reverse_iterator/rel_ops_c++20.cc: New test.
 427
 428         * include/bits/iterator_concepts.h (__detail::__decay_copy)
 429         (__detail::__member_begin, __detail::__adl_begin): Move here from
 430         <bits/range_access.h>.
 431         (__detail::__ranges_begin, __detail::__range_iter_t): Define.
 432         * bits/range_access.h (__cust_access::__decay_copy)
 433         (__cust_access::__member_begin, __cust_access::__adl_begin): Move to
 434         <bits/iterator_concepts.h>.
 435         (ranges::iterator_t): Use __detail::__range_iter_t.
 436         * include/bits/stl_iterator.h (back_insert_iterator): Simplify
 437         conditional compilation. Add _GLIBCXX20_CONSTEXPR to all members.
 438         (front_insert_iterator): Likewise.
 439         (insert_iterator): Implement changes from P0896R4 for C++20.
 440         * testsuite/24_iterators/back_insert_iterator/constexpr.cc: New test.
 441         * testsuite/24_iterators/front_insert_iterator/constexpr.cc: New test.
 442         * testsuite/24_iterators/headers/iterator/synopsis_c++17.cc: Adjust
 443         for inclusion in synopsis_c++20.cc which expects different signatures
 444         for some function templates.
 445         * testsuite/24_iterators/insert_iterator/constexpr.cc: New test.
 446
 447         * include/std/type_traits (__is_array_convertible): Move definition
 448         to immediately after is_convertible.
 449
 450 2020-03-26  Jonathan Wakely  <jwakely@redhat.com>
 451
 452         * include/std/chrono (chrono::days, chrono::weeks, chrono::years)
 453         (chrono::months, chrono::sys_days, chrono::local_t)
 454         (chrono::local_time, chrono::local_seconds, chrono::local_days):
 455         Define for C++20.
 456         (chrono::time_point): Add missing static assert.
 457         * testsuite/20_util/time_point/requirements/duration_neg.cc: New test.
 458         * testsuite/std/time/clock/file/overview.cc: New test.
 459         * testsuite/std/time/clock/file/members.cc: New test.
 460         * testsuite/std/time/syn_c++20.cc: New test.
 461
 462 2020-03-25  Mike Crowe  <mac@mcrowe.com>
 463
 464         * testsuite/30_threads/shared_timed_mutex/try_lock_until/1.cc: New
 465         test.
 466         * testsuite/30_threads/shared_timed_mutex/try_lock_until/2.cc: New
 467         test.
 468
 469 2020-03-25  Jonathan Wakely  <jwakely@redhat.com>
 470
 471         * include/bits/fs_fwd.h (filesystem::__file_clock): Move to ...
 472         * include/std/chrono (filesystem::__file_clock): Here.
 473         (filesystem::__file_clock::from_sys, filesystem::__file_clock::to_sys):
 474         Define public member functions for C++20.
 475         (is_clock, is_clock_v): Define traits for C++20.
 476         * include/std/condition_variable (condition_variable::wait_until): Add
 477         check for valid clock.
 478         * include/std/future (_State_baseV2::wait_until): Likewise.
 479         * include/std/mutex (__timed_mutex_impl::_M_try_lock_until): Likewise.
 480         * include/std/shared_mutex (shared_timed_mutex::try_lock_shared_until):
 481         Likewise.
 482         * include/std/thread (this_thread::sleep_until): Likewise.
 483         * testsuite/30_threads/condition_variable/members/2.cc: Qualify
 484         slow_clock with new namespace.
 485         * testsuite/30_threads/condition_variable/members/clock_neg.cc: New
 486         test.
 487         * testsuite/30_threads/condition_variable_any/members/clock_neg.cc:
 488         New test.
 489         * testsuite/30_threads/future/members/clock_neg.cc: New test.
 490         * testsuite/30_threads/recursive_timed_mutex/try_lock_until/3.cc:
 491         Qualify slow_clock with new namespace.
 492         * testsuite/30_threads/recursive_timed_mutex/try_lock_until/
 493         clock_neg.cc: New test.
 494         * testsuite/30_threads/shared_future/members/clock_neg.cc: New
 495         test.
 496         * testsuite/30_threads/shared_lock/locking/clock_neg.cc: New test.
 497         * testsuite/30_threads/shared_timed_mutex/try_lock_until/clock_neg.cc:
 498         New test.
 499         * testsuite/30_threads/timed_mutex/try_lock_until/3.cc: Qualify
 500         slow_clock with new namespace.
 501         * testsuite/30_threads/timed_mutex/try_lock_until/4.cc: Likewise.
 502         * testsuite/30_threads/timed_mutex/try_lock_until/clock_neg.cc: New
 503         test.
 504         * testsuite/30_threads/unique_lock/locking/clock_neg.cc: New test.
 505         * testsuite/std/time/traits/is_clock.cc: New test.
 506         * testsuite/util/slow_clock.h (slow_clock): Move to __gnu_test
 507         namespace.
 508
 509 2020-03-21  Jonathan Wakely  <jwakely@redhat.com>
 510
 511         PR libstdc++/93245
 512         * include/experimental/bits/fs_path.h (path::generic_string<C,T,A>()):
 513         * testsuite/experimental/filesystem/path/generic/generic_string.cc:
 514         Improve test coverage.
 515
 516         PR libstdc++/94242
 517         * include/bits/fs_path.h (path::_S_str_convert): Replace first
 518         parameter with basic_string_view so that strings with different
 519         allocators can be accepted.
 520         (path::generic_string<C,T,A>()): Use basic_string object that uses the
 521         right allocator type.
 522         * testsuite/27_io/filesystem/path/generic/94242.cc: New test.
 523         * testsuite/27_io/filesystem/path/generic/generic_string.cc: Improve
 524         test coverage.
 525
 526 2020-03-18  Jonathan Wakely  <jwakely@redhat.com>
 527
 528         PR libstdc++/94033
 529         * include/std/type_traits (__is_nt_default_constructible_atom): Remove.
 530         (__is_nt_default_constructible_impl): Remove.
 531         (__is_nothrow_default_constructible_impl): Remove.
 532         (__is_nt_constructible_impl): Add bool template parameter. Adjust
 533         partial specializations.
 534         (__is_nothrow_constructible_impl): Replace class template with alias
 535         template.
 536         (is_nothrow_default_constructible): Derive from alias template
 537         __is_nothrow_constructible_impl instead of
 538         __is_nothrow_default_constructible_impl.
 539         * testsuite/20_util/is_nothrow_constructible/94003.cc: New test.
 540
 541         * include/std/stop_token (stop_token::_Stop_state_ref): Define
 542         comparison operators explicitly if the compiler won't synthesize them.
 543
 544         * include/bits/stl_algobase.h (__lexicographical_compare_aux): Check
 545         __cpp_lib_concepts before using iter_reference_t.
 546         * include/bits/stream_iterator.h (istream_iterator): Check
 547         __cpp_lib_concepts before using default_sentinel_t.
 548         * include/bits/streambuf_iterator.h (istreambuf_iterator): Likewise.
 549
 550         PR libstdc++/94203
 551         * include/experimental/executor (executor::executor(Executor)): Call
 552         make_shared directly instead of _M_create. Create _Tgt1 object.
 553         (executor::executor(allocator_arg_t, const ProtoAlloc&, Executor)):
 554         Call allocate_shared directly instead of _M_create. Create _Tgt2
 555         object.
 556         (executor::target_type): Add cast needed for new _Tgt interface.
 557         (executor::target): Define when RTTI is disabled. Use _Tgt::_M_func.
 558         (executor::_Tgt): Define the same interface whether RTTI is enabled or
 559         not.
 560         (executor::_Tgt::target_type, executor::_Tgt::target): Do not use
 561         std::type_info in the interface.
 562         (executor::_Tgt::_M_func): Add data member.
 563         (executor::_TgtImpl): Replace with _Tgt1 and _Tgt2 class templates.
 564         (executor::_Tgt1::_S_func): Define function to access target without
 565         depending on RTTI.
 566         (executor::_M_create): Remove.
 567         (operator==, operator!=): Simplify comparisons for executor.
 568         * include/experimental/socket (is_error_code_enum<socket_errc>):
 569         Define specialization before use.
 570         * testsuite/experimental/net/executor/1.cc: New test.
 571
 572 2020-03-16  Jonathan Wakely  <jwakely@redhat.com>
 573
 574         PR libstdc++/94199
 575         * include/experimental/executor (service_already_exists): Add default
 576         constructor. Declare make_service to be a friend.
 577         * testsuite/experimental/net/execution_context/make_service.cc: New
 578         test.
 579
 580 2020-03-12  Jonathan Wakely  <jwakely@redhat.com>
 581
 582         * testsuite/tr1/8_c_compatibility/cstdlib/functions.cc: Do not pass
 583         a null pointer to functions with nonnull(1) attribute.
 584
 585 2020-03-11  Patrick Palka  <ppalka@redhat.com>
 586
 587         * include/std/ranges (split_view::_OuterIter::_OuterIter): Typo fix,
 588         'address' -> 'std::__addressof'.
 589         * testsuite/std/ranges/adaptors/split.cc: Test taking the split_view of
 590         a non-forward input_range.
 591         * testsuite/util/testsuite_iterators.h (output_iterator_wrapper): Make
 592         default constructor protected instead of deleted, like with
 593         input_iterator_wrapper.
 594         (test_range::iterator): Add comment explaining that this type is used
 595         only when the underlying wrapper is input_iterator_wrapper or
 596         output_iterator_wrapper.  Remove delegating defaulted constructor so
 597         that the inherited default constructor is used instead.
 598
 599         LWG 3286 ranges::size is not required to be valid after a call to
 600         ranges::begin on an input range
 601         * include/std/ranges (subrange::subrange): Split single-argument
 602         constructor into two, one constrained by _S_store_size and another by
 603         !_S_store_size.
 604         (take_view::begin): Call size() before calling ranges::begin(_M_base).
 605         * testsuite/std/ranges/adaptors/lwg3286.cc: New test.
 606         * testsuite/std/ranges/subrange/lwg3286.cc: New test.
 607
 608 2020-03-10  Jonathan Wakely  <jwakely@redhat.com>
 609
 610         * include/std/ranges (split_view::_OuterIter::__at_end): Use __current
 611         instead of _M_current.
 612         (split_view::_OuterIter::operator++): Likewise.
 613
 614         * include/std/ranges (transform_view::_Iterator::__iter_move): Remove.
 615         (transform_view::_Iterator::operator*): Add noexcept-specifier.
 616         (transform_view::_Iterator::iter_move): Inline __iter_move body here.
 617         (split_view::_OuterIter::__current): Add noexcept.
 618         (split_view::_InnerIter::__iter_swap): Remove.
 619         (split_view::_InnerIter::__iter_move): Remove.
 620         (split_view::_InnerIter::_M_i_current): New accessors.
 621         (split_view::_InnerIter::__at_end): Use _M_i_current().
 622         (split_view::_InnerIter::operator*): Likewise.
 623         (split_view::_InnerIter::operator++): Likewise.
 624         (iter_move(const _InnerIter&)): Likewise.
 625         (iter_swap(const _InnerIter&, const _InnerIter&)): Likewise.
 626         * testsuite/std/ranges/adaptors/split.cc: Check noexcept-specifier
 627         for iter_move and iter_swap on split_view's inner iterator.
 628
 629         PR c++/94117
 630         * include/std/ranges (ranges::transform_view::_Iterator::iter_move):
 631         Change expression in noexcept-specifier to match function body.
 632
 633         * testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Add
 634         comment explaining multiple dg-do directives.
 635         * testsuite/24_iterators/ostream_iterator/1.cc: Fix do-do directive
 636         so test is run as well as compiled.
 637
 638 2020-03-09  Jonathan Wakely  <jwakely@redhat.com>
 639
 640         PR libstdc++/94063
 641         * src/c++17/fs_path.cc (path::operator+=(const path&)): Add kluge to
 642         handle concatenations that change the type of the first component.
 643         (path::operator+=(basic_string_view<value_type>)): Likewise.
 644         * testsuite/27_io/filesystem/path/concat/94063.cc: New test.
 645
 646 2020-03-06  Patrick Palka  <ppalka@redhat.com>
 647
 648         * include/std/ranges (join_view::_Sentinel<_Const>): Befriend
 649         join_view::_Sentinel<!_Const>.
 650         * testsuite/std/ranges/adaptors/join.cc: Augment test.
 651
 652         PR libstdc++/93978
 653         * include/bits/range_access.h (__cust_access::_Empty::operator()):
 654         Declare return type to be bool instead of auto.
 655         * testsuite/std/ranges/adaptors/93978.cc: New test.
 656
 657 2020-03-06  Jonathan Wakely  <jwakely@redhat.com>
 658
 659         PR libstdc++/94069
 660         * include/std/shared_mutex [!PTHREAD_RWLOCK_INITIALIZER]
 661         (__shared_mutex_pthread::__shared_mutex_pthread()): Remove incorrect
 662         second argument to __glibcxx_rwlock_init.
 663         * testsuite/30_threads/shared_timed_mutex/94069.cc: New test.
 664
 665         PR libstdc++/93244
 666         * testsuite/27_io/filesystem/path/generic/generic_string.cc: Adjust
 667         test to not fail due to PR 94063.
 668         * testsuite/27_io/filesystem/path/generic/utf.cc: Likewise.
 669         * testsuite/27_io/filesystem/path/generic/wchar_t.cc: Likewise.
 670
 671 2020-03-06  Andreas Krebbel  <krebbel@linux.ibm.com>
 672
 673         * src/c++11/system_error.cc: Omit the ENOTSUP case statement if it
 674         would match ENOSYS.
 675
 676 2020-03-05  Jonathan Wakely  <jwakely@redhat.com>
 677
 678         * testsuite/27_io/filesystem/operations/all.cc: Mark unused variable.
 679         * testsuite/27_io/filesystem/operations/copy.cc: Fix typo.
 680         * testsuite/experimental/filesystem/operations/copy.cc: Likewise.
 681         * testsuite/27_io/filesystem/operations/file_size.cc: Use correct type
 682         for return value, and in comparison.
 683         * testsuite/experimental/filesystem/operations/file_size.cc: Likewise.
 684
 685         PR libstdc++/94051
 686         * include/std/string_view: Include <bits/ostream_insert.h>.
 687         * testsuite/21_strings/basic_string_view/inserters/94051.cc: New test.
 688
 689 2020-03-04  Jonathan Wakely  <jwakely@redhat.com>
 690
 691         * include/bits/cpp_type_traits.h (__memcpyable): Fix comment.
 692
 693 2020-03-04  Patrick Palka  <ppalka@redhat.com>
 694
 695         PR libstdc++/94017
 696         * include/bits/ranges_algobase.h (__fill_n_fn::operator()): Refine
 697         condition for when to use memset, making sure to additionally check that
 698         the output pointer's value type is a non-volatile byte type.  Instead of
 699         requiring that the fill type is a byte type, just require that it's an
 700         integral type.
 701         * testsuite/20_util/specialized_algorithms/uninitialized_fill/94017.cc:
 702         New test.
 703         * testsuite/20_util/specialized_algorithms/uninitialized_fill_n/94017.cc:
 704         New test.
 705         * testsuite/25_algorithms/fill/94013.cc: Uncomment part of test that was
 706         blocked by PR 94017.
 707         * testsuite/25_algorithms/fill/94017.cc: New test.
 708         * testsuite/25_algorithms/fill_n/94017.cc: New test.
 709
 710         LWG 3355 The memory algorithms should support move-only input iterators
 711         introduced by P1207
 712         * include/bits/ranges_uninitialized.h
 713         (__uninitialized_copy_fn::operator()): Use std::move to avoid attempting
 714         to copy __ifirst, which could be a move-only input iterator.  Use
 715         operator- instead of ranges::distance to compute distance from a sized
 716         sentinel.
 717         (__uninitialized_copy_n_fn::operator()): Likewise.
 718         (__uninitialized_move_fn::operator()): Likewise.
 719         (__uninitialized_move_n_fn::operator()): Likewise.
 720         (__uninitialized_destroy_fn::operator()): Use std::move to avoid
 721         attempting to copy __first.
 722         (__uninitialized_destroy_n_fn::operator()): Likewise.
 723         * testsuite/20_util/specialized_algorithms/destroy/constrained.cc:
 724         Augment test.
 725         * .../specialized_algorithms/uninitialized_copy/constrained.cc:
 726         Likewise.
 727         * .../specialized_algorithms/uninitialized_move/constrained.cc:
 728         Likewise.
 729
 730         * testsuite/util/testsuite_iterators.h (test_range::get_iterator): Make
 731         protected instead of private.
 732         (test_sized_range_sized_sent): New.
 733
 734         * testsuite/util/testsuite_iterators.h (input_iterator_wrapper_nocopy):
 735         New testsuite iterator.
 736         * testsuite/24_iterators/counted_iterator/lwg3389.cc: use it.
 737         * testsuite/24_iterators/move_iterator/lwg3390.cc: Likewise.
 738
 739         * include/bits/ranges_uninitialized.h
 740         (uninitialized_copy_fn::operator()): Pass a reference type as the first
 741         argument to is_nothrow_assignable_v.
 742         (uninitialized_copy_fn::operator()): Likewise.
 743         (uninitialized_move_fn::operator()): Likewise.  Return an in_out_result
 744         with the input iterator stripped of its move_iterator.
 745         (uninitialized_move_n_fn::operator()): Likewise.
 746         (uninitialized_fill_fn::operator()): Pass a reference type as the first
 747         argument to is_nothrow_assignable_v.
 748         (uninitialized_fill_n_fn::operator()): Likewise.
 749
 750 2020-03-03  Jonathan Wakely  <jwakely@redhat.com>
 751
 752         PR libstdc++/94013
 753         * include/bits/cpp_type_traits.h (__memcpyable, __memcmpable): New
 754         traits to control when to use memmove and memcmp optimizations.
 755         (__is_nonvolatile_trivially_copyable): New helper trait.
 756         * include/bits/ranges_algo.h (__lexicographical_compare_fn): Do not
 757         use memcmp optimization with volatile data.
 758         * include/bits/ranges_algobase.h (__equal_fn): Use __memcmpable.
 759         (__copy_or_move, __copy_or_move_backward): Use __memcpyable.
 760         * include/bits/stl_algobase.h (__copy_move_a2): Use __memcpyable.
 761         (__copy_move_backward_a2): Likewise.
 762         (__equal_aux1): Use __memcmpable.
 763         (__lexicographical_compare_aux): Do not use memcmp optimization with
 764         volatile data.
 765         * testsuite/25_algorithms/copy/94013.cc: New test.
 766         * testsuite/25_algorithms/copy_backward/94013.cc: New test.
 767         * testsuite/25_algorithms/equal/94013.cc: New test.
 768         * testsuite/25_algorithms/fill/94013.cc: New test.
 769         * testsuite/25_algorithms/lexicographical_compare/94013.cc: New test.
 770         * testsuite/25_algorithms/move/94013.cc: New test.
 771         * testsuite/25_algorithms/move_backward/94013.cc: New test.
 772
 773         * include/bits/stl_algobase.h (lexicographical_compare_three_way):
 774         Avoid redundant iterator comparisons (LWG 3410).
 775
 776 2020-03-02  Jonathan Wakely  <jwakely@redhat.com>
 777
 778         PR libstdc++/93972
 779         * include/bits/stl_algobase.h (__memcmp): Allow pointer types to
 780         differ.
 781         * testsuite/25_algorithms/lexicographical_compare/uchar.cc: New test.
 782
 783         * include/std/ranges (__detail::__maybe_empty_t): Rename to
 784         __maybe_present_t.
 785         (__adaptor::_RangeAdaptor, join_view, split_view): Use new name.
 786
 787         * include/bits/ranges_algo.h (shift_right): Add 'typename' to
 788         dependent type.
 789
 790 2020-03-01  H.J. Lu  <hongjiu.lu@intel.com>
 791
 792         * config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt: Updated.
 793
 794 2020-02-29  John David Anglin  <danglin@gcc.gnu.org>
 795
 796         * testsuite/17_intro/headers/c++1998/charset.cc: Skip on *-*-hpux*.
 797         * testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
 798         * testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
 799         * testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
 800         * testsuite/17_intro/headers/c++2020/charset.cc: Likewise.
 801
 802         * testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
 803         Add libatomic option.
 804         * testsuite/30_threads/jthread/jthread.cc: Likewise.
 805
 806 2020-02-29  François Dumont  <fdumont@gcc.gnu.org>
 807
 808         * include/bits/stl_algo.h
 809         (__find_if, __count_if, __is_permutation, std::is_permutation): Move...
 810         * include/bits/stl_algobase.h: ...here.
 811         * include/bits/hashtable_policy.h: Remove <bits/stl_algo.h> include.
 812
 813 2020-02-29  John David Anglin  <danglin@gcc.gnu.org>
 814
 815         * testsuite/30_threads/stop_token/stop_callback.cc: Add libatomic
 816         option.
 817         * testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc:
 818         Likewise.
 819         * testsuite/30_threads/stop_token/stop_callback/deadlock.cc: Likewise.
 820         * testsuite/30_threads/stop_token/stop_callback/destroy.cc: Likewise.
 821         * testsuite/30_threads/stop_token/stop_callback/invoke.cc: Likewise.
 822         * testsuite/30_threads/stop_token/stop_source.cc: Likewise.
 823         * testsuite/30_threads/stop_token/stop_source/assign.cc: Likewise.
 824         * testsuite/30_threads/stop_token/stop_token.cc: Likewise.
 825         * testsuite/30_threads/stop_token/stop_token/stop_possible.cc:
 826         Likewise.
 827
 828         PR libstdc++/92906
 829         * config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.
 830
 831 2020-02-28  Patrick Palka  <ppalka@redhat.com>
 832
 833         PR libstdc++/93972
 834         * include/bits/ranges_algo.h (__lexicographical_compare_fn::operator()):
 835         Fix condition for when to use memcmp, making it consistent with the
 836         corresponding condition used in std::lexicographical_compare.
 837         * testsuite/25_algorithms/lexicographical_compare/93972.cc: New test.
 838
 839         * testsuite/26_numerics/headers/numeric/synopsis.cc: Add signatures for
 840         functions introduced in C++11, C++17 and C++2a.  Add 'constexpr' to
 841         existing signatures for C++2a.
 842
 843 2020-02-28  Jonathan Wakely  <jwakely@redhat.com>
 844
 845         * testsuite/24_iterators/range_operations/advance_debug_neg.cc: Run
 846         test instead of just compiling it.
 847
 848 2020-02-28  Patrick Palka  <ppalka@redhat.com>
 849
 850         * include/std/ranges (reverse_view::_S_needs_cached_begin): Set to false
 851         whenever the underlying range models common_range.
 852
 853         * include/std/ranges (__detail::_CachedPosition): New struct.
 854         (views::filter_view::_S_needs_cached_begin): New member variable.
 855         (views::filter_view::_M_cached_begin): New member variable.
 856         (views::filter_view::begin): Use _M_cached_begin to cache its
 857         result.
 858         (views::drop_view::_S_needs_cached_begin): New static member variable.
 859         (views::drop_view::_M_cached_begin): New member variable.
 860         (views::drop_view::begin): Use _M_cached_begin to cache its result
 861         when _S_needs_cached_begin.
 862         (views::drop_while_view::_M_cached_begin): New member variable.
 863         (views::drop_while_view::begin): Use _M_cached_begin to cache its
 864         result.
 865         (views::reverse_view::_S_needs_cached_begin): New static member
 866         variable.
 867         (views::reverse_view::_M_cached_begin): New member variable.
 868         (views::reverse_view::begin): Use _M_cached_begin to cache its result
 869         when _S_needs_cached_begin.
 870         * testsuite/std/ranges/adaptors/drop.cc: Augment test to check that
 871         drop_view::begin caches its result.
 872         * testsuite/std/ranges/adaptors/drop_while.cc: Augment test to check
 873         that drop_while_view::begin caches its result.
 874         * testsuite/std/ranges/adaptors/filter.cc: Augment test to check that
 875         filter_view::begin caches its result.
 876         * testsuite/std/ranges/adaptors/reverse.cc: Augment test to check that
 877         reverse_view::begin caches its result.
 878
 879 2020-02-28  Jonathan Wakely  <jwakely@redhat.com>
 880
 881         * testsuite/27_io/filesystem/operations/last_write_time.cc: Fixes for
 882         filesystems that silently truncate timestamps.
 883         * testsuite/experimental/filesystem/operations/last_write_time.cc:
 884         Likewise.
 885
 886         * testsuite/21_strings/basic_string/cons/char/1.cc: Disable
 887         -Wstringop-overflow warnings.
 888
 889 2020-02-27  Jonathan Wakely  <jwakely@redhat.com>
 890
 891         * testsuite/lib/libstdc++.exp (v3_target_compile): Add
 892         -fdiagnostics-urls=never to options.
 893
 894 2020-02-27  Patrick Palka  <ppalka@redhat.com>
 895
 896         * include/std/ranges (transform_view::_Iterator<_Const>): Befriend
 897         _Iterator<!_Const>.
 898         (transform_view::_Sentinel<_Const>): Befriend _Sentinel<!_Const>.
 899         (take_view::_Sentinel<_Const>): Likewise.
 900         (take_while_view::_Sentinel<_Const>): Likewise.
 901         (split_view::_OuterIter<_Const>): Befriend _OuterIter<!_Const>.
 902         * testsuite/std/ranges/adaptors/split.cc: Augment test.
 903         * testsuite/std/ranges/adaptors/take.cc: Augment test.
 904         * testsuite/std/ranges/adaptors/take_while.cc: Augment test.
 905         * testsuite/std/ranges/adaptors/transform.cc: Augment test.
 906
 907         * testsuite/25_algorithms/copy/constrained.cc: Don't assume that the
 908         base() of a vector<>::iterator is a pointer.
 909         * testsuite/25_algorithms/copy_backward/constrained.cc: Likewise.
 910         * testsuite/25_algorithms/move/constrained.cc: Likewise.
 911         * testsuite/25_algorithms/move_backward/constrained.cc: Likewise.
 912         * testsuite/25_algorithms/inplace_merge/constrained.cc: Use foo.data()
 913         instead of &foo[0].
 914         * testsuite/25_algorithms/partial_sort/constrained.cc: Likewise.
 915         * testsuite/25_algorithms/partial_sort_copy/constrained.cc: Likewise.
 916         * testsuite/25_algorithms/shuffle/constrained.cc: Likewise.
 917         * testsuite/25_algorithms/sort/constrained.cc: Likewise.
 918         * testsuite/25_algorithms/stable_sort/constrained.cc: Likewise.
 919
 920 2020-02-27  Jonathan Wakely  <jwakely@redhat.com>
 921
 922         * include/debug/array (operator<=>): Define for C++20.
 923         * testsuite/23_containers/array/tuple_interface/get_debug_neg.cc:
 924         Adjust dg-error line numbers.
 925         * testsuite/23_containers/array/tuple_interface/
 926         tuple_element_debug_neg.cc: Likewise.
 927
 928         * testsuite/23_containers/span/back_assert_neg.cc: Add #undef before
 929         defining _GLIBCXX_ASSERTIONS.
 930         * testsuite/23_containers/span/first_2_assert_neg.cc: Likewise.
 931         * testsuite/23_containers/span/first_assert_neg.cc: Likewise.
 932         * testsuite/23_containers/span/front_assert_neg.cc: Likewise.
 933         * testsuite/23_containers/span/index_op_assert_neg.cc: Likewise.
 934         * testsuite/23_containers/span/last_2_assert_neg.cc: Likewise.
 935         * testsuite/23_containers/span/last_assert_neg.cc: Likewise.
 936         * testsuite/23_containers/span/subspan_2_assert_neg.cc: Likewise.
 937         * testsuite/23_containers/span/subspan_3_assert_neg.cc: Likewise.
 938         * testsuite/23_containers/span/subspan_4_assert_neg.cc: Likewise.
 939         * testsuite/23_containers/span/subspan_5_assert_neg.cc: Likewise.
 940         * testsuite/23_containers/span/subspan_6_assert_neg.cc: Likewise.
 941         * testsuite/23_containers/span/subspan_assert_neg.cc: Likewise.
 942
 943         * include/debug/string (__gnu_debug::basic_string::insert): Fix for
 944         C++98 where the member function of the base class returns void.
 945
 946         * testsuite/util/testsuite_iterators.h (forward_iterator_wrapper): Add
 947         equality comparisons that support value-initialized iterators.
 948
 949         * include/bits/boost_concept_check.h (__function_requires): Add
 950         _GLIBCXX14_CONSTEXPR.
 951         * testsuite/25_algorithms/min/concept_checks.cc: New test.
 952
 953 2020-02-26  Patrick Palka  <ppalka@redhat.com>
 954
 955         PR libstdc++/93936
 956         * include/std/ranges (split_view::_InnerIter::operator==): Compare
 957         the operands' _M_i rather than their _M_i.current().
 958         * testsuite/std/ranges/adaptors/split.cc: Augment test.
 959
 960         P1645R1 constexpr for <numeric> algorithms
 961         * include/bits/stl_numeric.h (iota, accumulate, inner_product,
 962         partial_sum, adjacent_difference): Make conditionally constexpr for
 963         C++20.
 964         * include/std/numeric (__cpp_lib_constexpr_numeric): Define this feature
 965         test macro.
 966         (reduce, transform_reduce, exclusive_scan, inclusive_scan,
 967         transform_exclusive_scan, transform_inclusive_scan): Make conditionally
 968         constexpr for C++20.
 969         * include/std/version (__cpp_lib_constexpr_numeric): Define.
 970         * testsuite/26_numerics/accumulate/constexpr.cc: New test.
 971         * testsuite/26_numerics/adjacent_difference/constexpr.cc: Likewise.
 972         * testsuite/26_numerics/exclusive_scan/constexpr.cc: Likewise.
 973         * testsuite/26_numerics/inclusive_scan/constexpr.cc: Likewise.
 974         * testsuite/26_numerics/inner_product/constexpr.cc: Likewise.
 975         * testsuite/26_numerics/iota/constexpr.cc: Likewise.
 976         * testsuite/26_numerics/partial_sum/constexpr.cc: Likewise.
 977         * testsuite/26_numerics/reduce/constexpr.cc: Likewise.
 978         * testsuite/26_numerics/transform_exclusive_scan/constexpr.cc: Likewise.
 979         * testsuite/26_numerics/transform_inclusive_scan/constexpr.cc: Likewise.
 980         * testsuite/26_numerics/transform_reduce/constexpr.cc: Likewise.
 981
 982 2020-02-26  Jonathan Wakely  <jwakely@redhat.com>
 983
 984         * include/bits/ranges_algo.h (__lexicographical_compare_fn): Declare
 985         variables in smaller scope and avoid calling ranges::distance when we
 986         know they are pointers. Remove statically-unreachable use of
 987         __builtin_unreachable().
 988         * include/bits/stl_algobase.h (__lexicographical_compare::__lc):
 989         Define inline.
 990
 991         * include/std/ranges (__detail::__maybe_empty_t): Define new helper
 992         alias.
 993         (__detail::__maybe_const_t): Likewise.
 994         (__adaptor::_RangeAdaptor): Use __maybe_empty_t.
 995         (transform_view, take_view, take_while_view, elements_view): Use
 996         __maybe_const_t.
 997         (join_view, split_view): Use both.
 998
 999 2020-02-25  Patrick Palka  <ppalka@redhat.com>
1000
1001         LWG 3397 basic_istream_view::iterator should not provide
1002         iterator_category
1003         * include/std/ranges (basic_istream_view:_Iterator::iterator_category):
1004         Rename to ...
1005         (basic_istream_view:_Iterator::iterator_concept): ... this.
1006         * testsuite/std/ranges/istream_view.cc: Augment test.
1007
1008         LWG 3325 Constrain return type of transformation function for
1009         transform_view
1010         * include/std/ranges (transform_view): Constrain the return type of the
1011         transformation function as per LWG 3325.
1012         * testsuite/std/ranges/adaptors/lwg3325_neg.cc: New test.
1013
1014         LWG 3313 join_view::_Iterator::operator-- is incorrectly constrained
1015         * include/std/ranges (join_view::_Iterator::operator--): Require that
1016         range_reference_t<_Base> models common_range.
1017         * testsuite/std/ranges/adaptors/lwg3313_neg.cc: New test.
1018
1019         LWG 3301 transform_view::_Iterator has incorrect iterator_category
1020         * include/std/ranges (transform_view::_Iterator::_S_iter_cat): Adjust
1021         determination of iterator_category as per LWG 3301.
1022         * testsuite/std/ranges/adaptors/transform.cc: Augment test.
1023
1024         LWG 3292 iota_view is under-constrained
1025         * include/std/ranges (iota_view): Require that _Winc models semiregular
1026           as per LWG 3292.
1027         * testsuite/std/ranges/iota/lwg3292_neg.cc: New test.
1028
1029 2020-02-25  Jonathan Wakely  <jwakely@redhat.com>
1030
1031         * include/bits/ranges_algobase.h (__copy_or_move): Do not use memmove
1032         during constant evaluation. Call __builtin_memmove directly instead of
1033         __memmove.
1034         (__copy_or_move_backward): Likewise.
1035         * include/bits/stl_algobase.h (__memmove): Remove.
1036         (__copy_move<M, true, random_access_iterator_tag>::__copy_m)
1037         (__copy_move_backward<M, true, random_access_iterator_tag>::__copy_m):
1038         Use __builtin_memmove directly instead of __memmove.
1039         (__copy_move_a2): Do not use memmove during constant evaluation.
1040         (__copy_move_backward_a2): Use _IsMove constant to select correct
1041         __copy_move_backward specialization.
1042         * testsuite/25_algorithms/copy_backward/constexpr.cc: Check for copies
1043         begin turned into moves during constant evaluation.
1044
1045         * testsuite/25_algorithms/move_backward/93872.cc: Add test left out of
1046         previous commit.
1047
1048         PR libstdc++/93872
1049         * include/bits/stl_algobase.h (__memmove): Cast away const before
1050         doing move assignment.
1051         * testsuite/25_algorithms/move/93872.cc: New test.
1052         * testsuite/25_algorithms/move_backward/93872.cc: New test.
1053
1054 2020-02-24  Patrick Palka  <ppalka@redhat.com>
1055
1056         PR libstdc++/93884
1057         * include/bits/ranges_algobase.h (__copy_or_move,
1058         __copy_or_move_backward): Don't inspect the iter_value_t of the output
1059         iterator, instead inspect its iterator_traits directly.
1060         * include/bits/stl_iterator.h (back_insert_iterator::container):
1061         Conditionally initialize.
1062         (back_insert_iterator::difference_type): Conditionally define.
1063         (back_insert_iterator::back_insert_iterator): Conditionally define this
1064         default constructor.
1065         (front_insert_iterator::container): Conditionally initialize.
1066         (front_insert_iterator::difference_type): Conditionally define.
1067         (front_insert_iterator::front_insert_iterator): Conditionally define
1068         this default constructor.
1069         * 24_iterators/back_insert_iterator/pr93884.cc: New test.
1070         * 24_iterators/front_insert_iterator/pr93884.cc: New test.
1071
1072         P0769R2 Add shift to <algorithm>
1073         * include/bits/ranges_algo.h (shift_left, shift_right): New.
1074         * testsuite/25_algorithms/shift_left/1.cc: New test.
1075         * testsuite/25_algorithms/shift_right/1.cc: New test.
1076
1077 2020-02-24  Jonathan Wakely  <jwakely@redhat.com>
1078
1079         * include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
1080         Make noexcept-specifier conditional.
1081         * testsuite/24_iterators/istream_iterator/cons/sentinel.cc: Check
1082         noexcept-specifier.
1083
1084         * include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
1085         Add constructor.
1086         (operator==(istream_iterator, default_sentinel_t)): Add operator.
1087         (ostream_iterator::difference_type): Define to ptrdiff_t for C++20.
1088         * include/bits/streambuf_iterator.h
1089         (istreambuf_iterator(default_sentinel_t)): Add constructor.
1090         (operator==(istreambuf_iterator, default_sentinel_t)): Add operator.
1091         * testsuite/24_iterators/istream_iterator/cons/sentinel.cc:
1092         New test.
1093         * testsuite/24_iterators/istream_iterator/sentinel.cc: New test.
1094         * testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc:
1095         New test.
1096         * testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.
1097
1098         * include/std/ranges (__deep_const_range, __enable_view_impl): Remove.
1099         (ranges::enable_view): Simplify (LWG 3326).
1100         * include/bits/range_access.h (ranges::enable_view): Declare.
1101         * include/bits/regex.h (__enable_view_impl): Remove partial
1102         specialization.
1103         * include/bits/stl_multiset.h (__enable_view_impl): Likewise.
1104         * include/bits/stl_set.h (__enable_view_impl): Likewise.
1105         * include/bits/unordered_set.h (__enable_view_impl): Likewise.
1106         * include/debug/multiset.h (__enable_view_impl): Likewise.
1107         * include/debug/set.h (__enable_view_impl): Likewise.
1108         * include/debug/unordered_set (__enable_view_impl): Likewise.
1109         * include/experimental/string_view (ranges::enable_view): Define
1110         partial specialization.
1111         * include/std/span (ranges::enable_view): Likewise.
1112         * include/std/string_view (ranges::enable_view): Likewise.
1113         * testsuite/std/ranges/view.cc: Check satisfaction of updated concept.
1114
1115 2020-02-21  Jonathan Wakely  <jwakely@redhat.com>
1116
1117         * include/std/optional (operator<=>(optional<T>, optional<U>))
1118         (operator<=>(optional<T>, nullopt), operator<=>(optional<T>, U)):
1119         Define for C++20.
1120         * include/std/tuple (__tuple_cmp): New helper function for <=>.
1121         (operator<=>(tuple<T...>, tuple<U>...)): Define for C++20.
1122         * include/std/variant (operator<=>(variant<T...>, variant<T...>))
1123         (operator<=>(monostate, monostate)): Define for C++20.
1124         * testsuite/20_util/optional/relops/three_way.cc: New test.
1125         * testsuite/20_util/tuple/comparison_operators/three_way.cc: New test.
1126         * testsuite/20_util/variant/89851.cc: Move to ...
1127         * testsuite/20_util/variant/relops/89851.cc: ... here.
1128         * testsuite/20_util/variant/90008.cc: Move to ...
1129         * testsuite/20_util/variant/relops/90008.cc: ... here.
1130         * testsuite/20_util/variant/relops/three_way.cc: New test.
1131
1132 2020-02-20  Patrick Palka  <ppalka@redhat.com>
1133
1134         * include/std/ranges (views::__adaptor::__maybe_refwrap): New utility
1135         function.
1136         (views::__adaptor::_RangeAdaptor::operator()): Add comments.  Use
1137         __maybe_refwrap to capture lvalue references by reference, and then use
1138         unwrap_reference_t to forward the by-reference captures as references.
1139         * testsuite/std/ranges/adaptors/split.cc: Augment test.
1140         * testsuite/std/ranges/adaptors/split_neg.cc: New test.
1141
1142         * include/std/ranges (iota_view): Forward declare _Sentinel.
1143         (iota_view::_Iterator): Befriend _Sentinel.
1144         (iota_view::_Sentinel::_M_equal): New member function.
1145         (iota_view::_Sentinel::operator==): Use it.
1146         (views::_Iota::operator()): Forward __f using the correct type.
1147         * testsuite/std/ranges/access/ssize.cc (test06): Don't call views::iota
1148         with integers of different signedness, to appease iota_view's deduction
1149         guide.
1150         * testsuite/std/ranges/iota/iota_view.cc: Augment test.
1151
1152 2020-02-20  Jonathan Wakely  <jwakely@redhat.com>
1153
1154         * include/bits/range_access.h (ranges::begin): Reject array of
1155         incomplete type.
1156         (ranges::end, ranges::size): Require arrays to be bounded.
1157         (ranges::data): Require lvalue or borrowed_range.
1158         (ranges::iterator_t): Remove constraint.
1159         * testsuite/std/ranges/access/begin.cc: Do not check array of
1160         incomplete type.
1161         * testsuite/std/ranges/access/begin_neg.cc: New test.
1162         * testsuite/std/ranges/access/end_neg.cc: Adjust expected error.
1163         * testsuite/std/ranges/access/size_neg.cc: Adjust expected error.
1164         * testsuite/std/ranges/access/ssize.cc: Do not check array of
1165         incomplete type.
1166
1167         * include/std/system_error (error_category::operator<=>)
1168         (operator<=>(const error_code&, const error_code&))
1169         (operator<=>(const error_condition&, const error_condition&)): Define
1170         for C++20.
1171         * testsuite/19_diagnostics/error_category/operators/less.cc: New test.
1172         * testsuite/19_diagnostics/error_category/operators/three_way.cc: New
1173         test.
1174         * testsuite/19_diagnostics/error_code/operators/equal.cc: Remove
1175         incorrect comment.
1176         * testsuite/19_diagnostics/error_code/operators/less.cc: New test.
1177         * testsuite/19_diagnostics/error_code/operators/not_equal.cc: Remove
1178         incorrect comment.
1179         * testsuite/19_diagnostics/error_code/operators/three_way.cc: New test.
1180         * testsuite/19_diagnostics/error_condition/operators/equal.cc: Remove
1181         incorrect comment.
1182         * testsuite/19_diagnostics/error_condition/operators/less.cc: New test.
1183         * testsuite/19_diagnostics/error_condition/operators/not_equal.cc:
1184         Remove incorrect comment.
1185         * testsuite/19_diagnostics/error_condition/operators/three_way.cc: New
1186         test.
1187
1188         * libsupc++/typeinfo (type_info::operator!=): Remove for C++20.
1189
1190         * include/std/thread (thread::id::operator<=>): Define for C++20.
1191         * testsuite/30_threads/thread/id/70294.cc: Do not take addresses of
1192         functions in namespace std.
1193         * testsuite/30_threads/thread/id/operators_c++20.cc: New test.
1194
1195 2020-02-19  Patrick Palka  <ppalka@redhat.com>
1196
1197         * testsuite/std/ranges/adaptors/split.cc (test03): Don't include the
1198         null terminator of the underlying string as part of the test_range.
1199         (main): Call test03.
1200
1201 2020-02-19  Jonathan Wakely  <jwakely@redhat.com>
1202
1203         * include/bits/stl_iterator.h (common_iterator): Add copyable<I>
1204         requirement (LWG 3385).
1205         * testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Adjust
1206         expected declaration.
1207
1208         * include/std/ranges (take_while_view, drop_view, drop_while_view)
1209         (elements_view:_Iterator): Initialize data members (LWG 3364).
1210
1211         * libsupc++/compare (three_way_comparable): Remove always-false check
1212         that should have been removed with weak_equality (P1959R0).
1213         (three_way_comparable_with): Likewise. Reorder requirements (LWG 3360).
1214
1215         * include/std/concepts (__detail::__partially_ordered_with): Move here
1216         from <compare>.
1217         (totally_ordered, totally_ordered_with): Use __partially_ordered_with
1218         to simplify definition (LWG 3331).
1219         * libsupc++/compare (__detail::__partially_ordered_with): Move to
1220         <concepts>.
1221
1222         * include/std/concepts (totally_ordered_with): Remove redundant
1223         requirement (LWG 3329).
1224
1225         * include/std/ranges (__detail::__convertible_to_non_slicing): New
1226         helper concept.
1227         (__detail::__pair_like_convertible_to): Remove.
1228         (__detail::__pair_like_convertible_from): Add requirements for
1229         non-slicing conversions.
1230         (subrange): Constrain constructors with __convertible_to_non_slicing.
1231         Remove constructors from pair-like types. Add new deduction guide.
1232         * testsuite/std/ranges/subrange/lwg3282_neg.cc: New test.
1233
1234         * include/bits/iterator_concepts.h (iter_move): Add declaration to
1235         prevent unqualified lookup finding a suitable declaration (LWG 3247).
1236
1237         * include/std/memory_resource (polymorphic_allocator::allocate)
1238         (polymorphic_allocator::allocate_object): Change type of exception to
1239         bad_array_new_length (LWG 3237).
1240         * testsuite/20_util/polymorphic_allocator/lwg3237.cc: New test.
1241
1242         * include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
1243         * include/std/version (__cpp_lib_unwrap_ref): Likewise.
1244         * testsuite/20_util/unwrap_reference/1.cc: Check macro.
1245         * testsuite/20_util/unwrap_reference/3.cc: New test.
1246
1247         * include/std/numeric (midpoint(T8, T*)): Do not check for complete
1248         type during overload resolution, use static assert instead (LWG 3200).
1249         * testsuite/26_numerics/midpoint/pointer.cc: Do not test with
1250         incomplete type.
1251         * testsuite/26_numerics/midpoint/pointer_neg.cc: New test.
1252
1253         * include/std/span (span(T (&)[N])): Use non-deduced context to
1254         prevent first parameter from interfering with class template argument
1255         deduction (LWG 3369).
1256         * testsuite/23_containers/span/deduction.cc: Add missing 'const'.
1257         * testsuite/23_containers/span/lwg3255.cc: Check for construction from
1258         rvalues.
1259
1260         * include/std/span (span::const_iterator, span::const_reverse_iterator)
1261         (span::cbegin(), span::cend(), span::crbegin(), span::crend()):
1262         Remove (LWG 3320).
1263         * testsuite/23_containers/span/everything.cc: Replace uses of cbegin
1264         and cend.
1265         * testsuite/20_util/specialized_algorithms/destroy/constrained.cc:
1266         Likewise.
1267         * testsuite/20_util/specialized_algorithms/uninitialized_copy/
1268         constrained.cc: Likewise.
1269         * testsuite/20_util/specialized_algorithms/
1270         uninitialized_default_construct/constrained.cc: Likewise.
1271         * testsuite/20_util/specialized_algorithms/uninitialized_fill/
1272         constrained.cc: Likewise.
1273         * testsuite/20_util/specialized_algorithms/uninitialized_move/
1274         constrained.cc: Likewise.
1275         * testsuite/20_util/specialized_algorithms/
1276         uninitialized_value_construct/constrained.cc: Likewise.
1277
1278         * include/bits/range_access.h (range_size_t): Define alias template.
1279         * include/std/ranges (all_view): Rename to views::all_t (LWG 3335).
1280         * testsuite/std/ranges/adaptors/filter.cc: Adjust to new name.
1281
1282         * include/std/ranges (filter_view, transform_view, take_view)
1283         (join_view, split_view, reverse_view): Remove commented-out converting
1284         constructors (LWG 3280).
1285
1286         * include/std/memory (uninitialized_construct_using_allocator): Use
1287         std::construct_at (LWG 3321).
1288
1289         * include/std/memory_resource (polymorphic_allocator::allocate_bytes)
1290         (polymorphic_allocator::allocate_object)
1291         (polymorphic_allocator::new_object): Add nodiscard attribute (LWG3304).
1292
1293         LWG 3379. "safe" in several library names is misleading
1294         * include/bits/range_access.h (enable_safe_range): Rename to
1295         enable_borrowed_range.
1296         (__detail::__maybe_safe_range): Rename to __maybe_borrowed_range.
1297         (safe_range): Rename to borrowed_range.
1298         * include/bits/ranges_algo.h: Adjust to use new names.
1299         * include/bits/ranges_algobase.h: Likewise.
1300         * include/bits/ranges_uninitialized.h: Likewise.
1301         * include/std/ranges: Likewise.
1302         (safe_iterator_t): Rename to borrowed_iterator_t.
1303         (safe_subrange_t): Rename to borrowed_subrange_t.
1304         * include/std/span: Adjust to use new names.
1305         * include/std/string_view: Likewise.
1306         * include/experimental/string_view: Likewise.
1307         * testsuite/std/ranges/access/begin.cc: Likewise.
1308         * testsuite/std/ranges/access/cbegin.cc: Likewise.
1309         * testsuite/std/ranges/access/cdata.cc: Likewise.
1310         * testsuite/std/ranges/access/cend.cc: Likewise.
1311         * testsuite/std/ranges/access/crbegin.cc: Likewise.
1312         * testsuite/std/ranges/access/crend.cc: Likewise.
1313         * testsuite/std/ranges/access/data.cc: Likewise.
1314         * testsuite/std/ranges/access/end.cc: Likewise.
1315         * testsuite/std/ranges/access/rbegin.cc: Likewise.
1316         * testsuite/std/ranges/access/rend.cc: Likewise.
1317         * testsuite/std/ranges/safe_range.cc: Likewise.
1318         * testsuite/std/ranges/safe_range_types.cc: Likewise.
1319         * testsuite/util/testsuite_iterators.h: Likewise.
1320
1321         * include/std/ranges (tuple_element<0, const subrange<I, S, K>>)
1322         (tuple_element<1, const subrange<I, S, K>>): Add partial
1323         specializations (LWG 3398).
1324         * testsuite/std/ranges/subrange/tuple_like.cc: New test.
1325
1326         * include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
1327         (__adjacent_find_fn, __remove_if_fn, __remove_copy_if_fn)
1328         (__unique_fn, __unique_copy_fn): Remove redundant conversions to bool.
1329
1330 2020-02-18  Patrick Palka  <ppalka@redhat.com>
1331
1332         P1983R0 Wording for GB301, US296, US292, US291, and US283
1333         * include/std/ranges (filter_view::pred): New member function.
1334         (join_view::_Iterator::_Iterator): Remove now-redundant comment since
1335         P1983R0 fixes the highlighted issue in the same way.
1336         (join_view::_Iterator<_Const>): Add friend
1337         join_view::_Iterator<!_Const>.
1338         (join_view::_M_inner): Remove mutable specifier, effectively reverting
1339         the proposed wording changes of P3278.
1340         (join_view::begin): Refine the condition for when to return a const
1341         iterator.
1342         (split_view::_OuterIter::_OuterIter): Adjust constraints.
1343         * testsuite/std/ranges/adaptors/filter.cc: Test that filter_view::pred
1344         exists and works.
1345
1346 2020-02-18  Jonathan Wakely  <jwakely@redhat.com>
1347
1348         PR libstdc++/93818
1349         * include/std/ranges (_RangeAdaptor): Add deduction guide.
1350         (filter_view::_Iterator): Add alias _Vp_iter and use in place of
1351         iterator_t<_Vp>.
1352         (filter_view::_Iterator::_S_iter_cat()): Add 'typename'.
1353         (transform_view::_Iterator): Add alias _Base_iter and use in place of
1354         iterator_t<_Base>.
1355         (transform_view::_Iterator::_S_iter_cat()): Add 'typename'.
1356         (join_view::_Iterator): Add _Outer_iter and _Inner_iter aliases.
1357         (join_view::_Iterator::_S_iter_cat()): Add 'typename'.
1358         (split_view::_InnerIter::_S_iter_cat()): Likewise.
1359
1360         * testsuite/20_util/integer_comparisons/equal.cc: Fix invalid
1361         assumption that long is wider than int.
1362         * testsuite/20_util/integer_comparisons/greater_equal.cc: Likewise.
1363         * testsuite/20_util/integer_comparisons/less.cc: Likewise.
1364         * testsuite/20_util/integer_comparisons/less_equal.cc: Likewise.
1365         * testsuite/20_util/integer_comparisons/not_equal.cc: Likewise.
1366
1367         P1976R2 Fixed-size span construction from dynamic range
1368         * include/std/span (__cpp_lib_span): Update value.
1369         (span(It, size_type), span(It, End)): Make conditionally explicit. Add
1370         assertion.
1371         (span(R&&), span(const span<OType, OExtent>&)): Likewise and relax
1372         constraints.
1373         (span::first<Count>(), span::last<Count>()): Use explicit type in
1374         return statement.
1375         (as_bytes, as_writable_bytes): Likewise.
1376         * include/std/version (__cpp_lib_span): Update value.
1377         * testsuite/23_containers/span/1.cc: Check new value.
1378         * testsuite/23_containers/span/2.cc: Check new value.
1379         * testsuite/23_containers/span/explicit.cc: New test.
1380
1381         * include/std/span (span::__is_compatible_array): Simplify alias
1382         template by using requires-clause.
1383         (span::__is_compatible_ref): New alias template for constraining
1384         constructors.
1385         (span::__is_compatible_iterator, span::__is_compatible_range): Remove.
1386         (span(It, size_type), span(It, End)): Use __is_compatible_ref.
1387         (span(T(&)[N], span(array<T, N>&), span(const array<T, N>&)): Remove
1388         redundant parentheses.
1389         (span(R&&)): Add missing constraints.
1390
1391         * include/std/span (span): Reorder members and rename template
1392         parameters to match declarations in the C++2a working paper.
1393
1394         P2116R0 Remove tuple-like protocol support from fixed-extent span
1395         * include/std/span (get, tuple_size, tuple_element): Remove.
1396         * testsuite/23_containers/span/everything.cc: Remove checks for
1397         tuple-like API.
1398         * testsuite/23_containers/span/get_neg.cc: Remove.
1399         * testsuite/23_containers/span/tuple_element_dynamic_neg.cc: Remove.
1400         * testsuite/23_containers/span/tuple_element_oob_neg.cc: Remove.
1401         * testsuite/23_containers/span/tuple_size_neg.cc: Remove.
1402
1403 2020-02-17  Patrick Palka  <ppalka@redhat.com>
1404
1405         P2106R0 Alternative wording for GB315 and GB316
1406         * include/bits/ranges_algo.h (in_fun_result): New.
1407         (for_each_result, for_each_n_result): Change into an alias of
1408         in_fun_result.
1409         (in_in_result): New.
1410         (mismatch_result): Change into an alias of in_in_result.
1411         (copy_if_result): Change into an alias of in_out_result.
1412         (swap_ranges_result): Change into an alias of in_in_result.
1413         (unary_transform_result): Change into an alias of in_out_result.
1414         (in_in_out_result): New.
1415         (binary_transform_result): Change into an alias of in_in_out_result.
1416         (replace_copy_result, replace_copy_if_result, remove_copy_if_result,
1417         remove_copy_result, unique_copy_result, reverse_copy_result,
1418         rotate_copy_result, partial_sort_copy_result): Change into an alias of
1419         in_out_result.
1420         (in_out_out_result): New.
1421         (partition_copy_result, merge_result): Change into an alias of
1422         in_out_out_result.
1423         (set_union_result, set_intersection_result): Change into an alias of
1424         in_in_out_result.
1425         (set_difference_result): Change into an alias of in_out_result.
1426         (set_symmetric_difference): Change into an alias of in_in_out_result.
1427         (min_max_result): New.
1428         (minmax_result, minmax_element_result): Change into an alias of
1429         min_max_result.
1430         (in_found_result): New.
1431         (next_permutation_result, prev_permutation_result): Change into an alias
1432         of in_found_result.
1433         (__next_permutation_fn::operator(), __prev_permutation_fn::operator()):
1434         Adjust following changes to next_permutation_result and
1435         prev_permutation_result.
1436         * include/bits/ranges_algobase.h (in_out_result): New.
1437         (copy_result, move_result, move_backward_result, copy_backward_result,
1438         copy_n_result): Change into an alias of in_out_result.
1439         * include/bits/ranges_uninitialized.h (uninitialized_copy_result,
1440         uninitialized_copy_n_result, uninitialized_move_result,
1441         uninitialized_move_n_result): Likewise.
1442         * testsuite/25_algorithms/next_permutation/constrained.cc: Adjust uses of
1443         structured bindings.
1444         * testsuite/25_algorithms/prev_permutation/constrained.cc: Likewise.
1445
1446         P1243R4 Rangify new algorithms
1447         * include/bits/ranges_algo.h (for_each_n_result, __for_each_n_fn,
1448         for_each_n, __sample_fn, sample, __clamp_fn, clamp): New.
1449         * testsuite/25_algorithms/clamp/constrained.cc: New test.
1450         * testsuite/25_algorithms/for_each/constrained.cc: Augment test.
1451         * testsuite/25_algorithms/sample/constrained.cc: New test.
1452
1453 2020-02-17  Jonathan Wakely  <jwakely@redhat.com>
1454
1455         P1964R2 Wording for boolean-testable
1456         * include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
1457         (__adjacent_find_fn): Cast result of predicate to bool.
1458         * include/std/concepts (__boolean): Remove.
1459         (__detail::__boolean_testable_impl, __detail::__boolean_testable): Add
1460         new helper concepts.
1461         (__detail::__weakly_eq_cmp_with, totally_ordered, totally_ordered_with)
1462         (predicate): Use __boolean_testable instead of boolean.
1463         * libsupc++/compare (__detail::__partially_ordered, _Synth3way):
1464         Likewise.
1465
1466         P1970R2 Consistency for size() functions: Add ranges::ssize
1467         * include/bits/range_access.h (_SSize, ssize): Define for C++20.
1468         * testsuite/std/ranges/access/ssize.cc: New test.
1469
1470         P1956R1 On the names of low-level bit manipulation functions
1471         * include/bits/hashtable_policy.h: Update comment.
1472         * include/std/bit (__ispow2, __ceil2, __floor2, __log2p1): Rename.
1473         (ispow2, ceil2, floor2, log2p1): Likewise.
1474         (__cpp_lib_int_pow2): Add feature test macro.
1475         * include/std/charconv (__to_chars_len_2): Adjust use of __log2p1.
1476         * include/std/memory (assume_aligned): Adjust use of ispow2.
1477         * include/std/version (__cpp_lib_int_pow2): Add.
1478         * libsupc++/new_opa.cc: Adjust use of __ispow2.
1479         * src/c++17/memory_resource.cc: Likewise, and for __ceil2 and __log2p1.
1480         * testsuite/17_intro/freestanding.cc: Adjust use of ispow2.
1481         * testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Rename to ...
1482         * testsuite/26_numerics/bit/bit.pow.two/bit_ceil.cc: ... here.
1483         * testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Rename to ...
1484         * testsuite/26_numerics/bit/bit.pow.two/bit_ceil_neg.cc: ... here.
1485         * testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Rename to ...
1486         * testsuite/26_numerics/bit/bit.pow.two/bit_floor.cc: ... here.
1487         * testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Rename to ...
1488         * testsuite/26_numerics/bit/bit.pow.two/bit_width.cc: ... here.
1489         * testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Rename to ...
1490         * testsuite/26_numerics/bit/bit.pow.two/has_single_bit.cc: ... here.
1491
1492         * include/std/charconv: Add comment.
1493
1494         PR libstdc++/92546 (partial)
1495         * include/bits/random.h (uniform_random_bit_generator): Move definition
1496         to <bits/uniform_int_dist.h>.
1497         * include/bits/ranges_algo.h: Include <bits/uniform_int_dist.h> instead
1498         of <bits/random.h>.
1499         * include/bits/ranges_algobase.h: Do not include <cmath>.
1500         * include/bits/uniform_int_dist.h (uniform_random_bit_generator):
1501         Move here.
1502         * include/std/ranges: Do not include <limits>.
1503         * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.
1504
1505         PR libstdc++/92546 (partial)
1506         * include/Makefile.am: Add new header.
1507         * include/Makefile.in: Regenerate.
1508         * include/bits/int_limits.h: New header.
1509         * include/bits/parse_numbers.h (__select_int::_Select_int): Replace
1510         numeric_limits with __detail::__int_limits.
1511         * include/std/bit (__rotl, __rotr, __countl_zero, __countl_one)
1512         (__countr_zero, __countr_one, __popcount, __ceil2, __floor2, __log2p1):
1513         Likewise.
1514         * include/std/charconv (__to_chars_8, __from_chars_binary)
1515         (__from_chars_alpha_to_num, from_chars): Likewise.
1516         * include/std/memory_resource (polymorphic_allocator::allocate)
1517         (polymorphic_allocator::allocate_object): Likewise.
1518         * include/std/string_view (basic_string_view::_S_compare): Likewise.
1519         * include/std/utility (in_range): Likewise.
1520         * testsuite/20_util/integer_comparisons/in_range_neg.cc: Adjust for
1521         extra error about incomplete type __int_limits<bool>.
1522         * testsuite/26_numerics/bit/bit.count/countl_one.cc: Include <limits>.
1523         * testsuite/26_numerics/bit/bit.count/countl_zero.cc: Likewise.
1524         * testsuite/26_numerics/bit/bit.count/countr_one.cc: Likewise.
1525         * testsuite/26_numerics/bit/bit.count/countr_zero.cc: Likewise.
1526         * testsuite/26_numerics/bit/bit.count/popcount.cc: Likewise.
1527         * testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Likewise.
1528         * testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Likewise.
1529         * testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
1530         * testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
1531         * testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
1532         * testsuite/26_numerics/bit/bit.rotate/rotl.cc: Likewise.
1533         * testsuite/26_numerics/bit/bit.rotate/rotr.cc: Likewise.
1534
1535         * python/libstdcxx/v6/printers.py (StdCmpCatPrinter.to_string): Update
1536         value for partial_ordering::unordered.
1537
1538         * include/bits/iterator_concepts.h (indirectly_copyable_storable): Add
1539         const-qualified expression variations.
1540         * include/std/concepts (copyable): Likewise.
1541
1542         * include/std/type_traits (__is_standard_integer): New helper trait.
1543         * include/std/utility (cmp_equal, cmp_not_equal, cmp_less, cmp_greater)
1544         (cmp_less_equal, cmp_greater_equal, in_range): Define for C++20.
1545         * include/std/version (__cpp_lib_integer_comparison_functions): Define.
1546         * testsuite/20_util/integer_comparisons/1.cc: New test.
1547         * testsuite/20_util/integer_comparisons/2.cc: New test.
1548         * testsuite/20_util/integer_comparisons/equal.cc: New test.
1549         * testsuite/20_util/integer_comparisons/equal_neg.cc: New test.
1550         * testsuite/20_util/integer_comparisons/greater_equal.cc: New test.
1551         * testsuite/20_util/integer_comparisons/greater_equal_neg.cc: New test.
1552         * testsuite/20_util/integer_comparisons/greater_neg.cc: New test.
1553         * testsuite/20_util/integer_comparisons/in_range.cc: New test.
1554         * testsuite/20_util/integer_comparisons/in_range_neg.cc: New test.
1555         * testsuite/20_util/integer_comparisons/less.cc: New test.
1556         * testsuite/20_util/integer_comparisons/less_equal.cc: New test.
1557         * testsuite/20_util/integer_comparisons/less_equal_neg.cc: New test.
1558         * testsuite/20_util/integer_comparisons/less_neg.cc: New test.
1559         * testsuite/20_util/integer_comparisons/not_equal.cc: New test.
1560         * testsuite/20_util/integer_comparisons/not_equal_neg.cc: New test.
1561
1562 2020-02-16  Patrick Palka  <ppalka@redhat.com>
1563
1564         * include/bits/ranges_algo.h (__lexicographical_compare_fn::operator()):
1565         Move code after an early exit constexpr if to under an else branch.
1566         * include/bits/ranges_algobase.h (__equal_fn::operator()): Likewise.
1567
1568 2020-02-15  Patrick Palka  <ppalka@redhat.com>
1569
1570         * include/bits/ranges_algo.h: Adjust whitespace and formatting.
1571         * include/bits/ranges_algobase.h: Likewise.
1572         * include/bits/ranges_uninitialized.h: Likewise.
1573
1574         * include/bits/ranges_algo.h: (adjacent_find, all_of, any_of,
1575         binary_search, copy_if, count, count_if, equal_range, find, find_end,
1576         find_first_of, find_if, find_if_not, for_each, generate, generate_n,
1577         includes, inplace_merge, is_heap, is_heap_until, is_partitioned,
1578         is_permutation, is_sorted, is_sorted_until, lexicographical_compare,
1579         lower_bound, make_heap, max, max_element, merge, min, min_element,
1580         minmax, minmax_element, mismatch, next_permutation, none_of,
1581         nth_element, partial_sort, partial_sort_copy, partition, partition_copy,
1582         partition_point, pop_heap, prev_permutation, push_heap, remove,
1583         remove_copy, remove_copy_if, remove_if, replace, replace_copy,
1584         replace_copy_if, replace_if, reverse, reverse_copy, rotate, rotate_copy,
1585         search, search_n, set_difference, set_intersection,
1586         set_symmetric_difference, set_union, shuffle, sort, sort_heap,
1587         stable_partition, stable_sort, swap_ranges, transform, unique,
1588         unique_copy, upper_bound): Convert into function objects.
1589         * include/bits/ranges_algobase.h: (equal, copy, move, copy_n, fill_n,
1590         fill, move_backward, copy_backward): Likewise.
1591         * include/bits/ranges_uninitialized.h (uninitialized_default_construct,
1592         uninitialized_default_construct_n, uninitialized_value_construct,
1593         uninitialized_value_construct_n, uninitialized_copy,
1594         uninitialized_copy_n, uninitialized_move, uninitialized_move_n,
1595         uninitialized_fill, uninitialized_fill_n, construct_at, destroy_at,
1596         destroy, destroy_n): Likewise.
1597
1598         * include/bits/ranges_algo.h (ranges::__find_end): Fold into ...
1599         (ranges::find_end): ... here.
1600         (ranges::__lexicographical_compare): Fold into ...
1601         (ranges::lexicographical_compare): ... here.
1602         * include/bits/ranges_algobase.h (ranges::__equal): Fold into ...
1603         (ranges::equal): ... here.
1604
1605 2020-02-15  Jonathan Wakely  <jwakely@redhat.com>
1606
1607         * include/bits/erase_if.h (__cpp_lib_erase_if): Define to 202002L.
1608         * include/std/deque: Likewise.
1609         * include/std/forward_list: Likewise.
1610         * include/std/list: Likewise.
1611         * include/std/string: Likewise.
1612         * include/std/vector: Likewise.
1613         * include/std/version: Likewise.
1614         * testsuite/23_containers/deque/erasure.cc: Test for new value.
1615         * testsuite/23_containers/forward_list/erasure.cc: Likewise.
1616         * testsuite/23_containers/list/erasure.cc: Likewise.
1617         * testsuite/23_containers/map/erasure.cc: Likewise.
1618         * testsuite/23_containers/set/erasure.cc: Likewise.
1619         * testsuite/23_containers/unordered_map/erasure.cc: Likewise.
1620         * testsuite/23_containers/unordered_set/erasure.cc: Likewise.
1621         * testsuite/23_containers/vector/erasure.cc: Likewise.
1622
1623 2020-02-15  Jonathan Wakely  <jwakely@redhat.com>
1624
1625         * include/bits/random.h (uniform_random_bit_generator): Require min()
1626         and max() to be constant expressions and min() to be less than max().
1627         * testsuite/26_numerics/random/concept.cc: Check additional cases.
1628         * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.
1629
1630 2020-02-13  Patrick Palka  <ppalka@redhat.com>
1631
1632         * include/Makefile.am: Add <bits/ranges_uninitialized.h>.
1633         * include/Makefile.in: Regenerate.
1634         * include/bits/ranges_uninitialized.h: New header.
1635         * include/std/memory: Include it.
1636         * testsuite/20_util/specialized_algorithms/destroy/constrained.cc: New
1637         test.
1638         * .../uninitialized_copy/constrained.cc: New test.
1639         * .../uninitialized_default_construct/constrained.cc: New test.
1640         * .../uninitialized_fill/constrained.cc: New test.
1641         * .../uninitialized_move/constrained.cc: New test.
1642         * .../uninitialized_value_construct/constrained.cc: New test.
1643
1644         * include/Makefile.am: Add bits/ranges_algobase.h
1645         * include/Makefile.in: Regenerate.
1646         * bits/ranges_algo.h: Include <bits/ranges_algobase.h> and refactor
1647         existing #includes.
1648         (__detail::__is_normal_iterator, __detail::is_reverse_iterator,
1649         __detail::__is_move_iterator, copy_result, move_result,
1650         __equal, equal, copy_result, move_result, move_backward_result,
1651         copy_backward_result, __copy_or_move_backward, __copy_or_move, copy,
1652         move, copy_backward, move_backward, copy_n_result, copy_n, fill_n,
1653         fill): Split out into ...
1654         * bits/range_algobase.h: ... this new header.
1655
1656 2020-02-12  Patrick Palka  <ppalka@redhat.com>
1657
1658         LWG 3389 and LWG 3390
1659         * include/bits/stl_iterator.h (move_move_iterator): Use std::move when
1660         constructing the move_iterator with __i.
1661         (counted_iterator::counted_iterator): Use std::move when initializing
1662         M_current with __i.
1663         * testsuite/24_iterators/counted_iterator/lwg3389.cc: New test.
1664         * testsuite/24_iterators/move_iterator/lwg3390.cc: New test.
1665
1666 2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
1667
1668         PR libstdc++/79193
1669         PR libstdc++/88999
1670
1671         * configure: Regenerated.
1672
1673 2020-02-12  François Dumont  <fdumont@gcc.gnu.org>
1674
1675         * include/bits/hashtable.h
1676         (_Hashtable<>(_Hashtable&&, std::allocator_type&)): Add
1677         missing std namespace qualification to forward call.
1678
1679 2020-02-09  Jonathan Wakely  <jwakely@redhat.com>
1680
1681         * testsuite/20_util/function_objects/range.cmp/equal_to.cc: Fix
1682         comment.
1683         * testsuite/20_util/function_objects/range.cmp/less.ccL Likewise.
1684
1685         * include/std/ranges: Fix non-ASCII characters in comment.
1686
1687         * include/bits/range_cmp.h (__detail::__eq_builtin_ptr_cmp): Require
1688         equality comparison to be valid and return bool.
1689         (__detail::__less_builtin_ptr_cmp): Likewise for less-than comparison.
1690         * testsuite/20_util/function_objects/range.cmp/equal_to.cc: Check
1691         type with ambiguous conversion to fundamental types.
1692         * testsuite/20_util/function_objects/range.cmp/less.cc: Likewise.
1693
1694 2020-02-07  Jonathan Wakely  <jwakely@redhat.com>
1695
1696         * include/bits/iterator_concepts.h (iter_difference_t, iter_value_t):
1697         Use remove_cvref_t.
1698         (readable_traits): Rename to indirectly_readable_traits.
1699         (readable): Rename to indirectly_readable.
1700         (writable): Rename to indirectly_writable.
1701         (__detail::__iter_exchange_move): Do not use remove_reference_t.
1702         (indirectly_swappable): Adjust requires expression parameter types.
1703         expression.
1704         * include/bits/ranges_algo.h (ranges::transform, ranges::replace)
1705         (ranges::replace_if, ranges::generate_n, ranges::generate)
1706         (ranges::remove): Use new name for writable.
1707         * include/bits/stl_iterator.h (__detail::__common_iter_has_arrow):
1708         Use new name for readable.
1709         * include/ext/pointer.h (readable_traits<_Pointer_adapter<P>>): Use
1710         new name for readable_traits.
1711         * testsuite/24_iterators/associated_types/readable.traits.cc: Likewise.
1712         * testsuite/24_iterators/indirect_callable/projected.cc: Adjust for
1713         new definition of indirectly_readable.
1714
1715         * include/bits/stl_iterator.h (__detail::__common_iter_ptr): Change
1716         to take parameters of common_iterator, instead of the common_iterator
1717         type itself. Fix argument for __common_iter_has_arrow constraint.
1718         (iterator_traits<common_iterator<I, S>>::pointer): Adjust.
1719
1720 2020-02-07  Jonathan Wakely  <jwakely@redhat.com>
1721
1722         * include/std/ranges (iota_view): Add braces to prevent -Wempty-body
1723         warning.
1724         (basic_istream_view::_Iterator::operator++()): Add missing return.
1725
1726 2020-02-07  Patrick Palka  <ppalka@redhat.com>
1727
1728         * include/bits/ranges_algo.h: Remove extraneous &&.
1729
1730         * include/std/ranges (ranges::__detail::__stream_extractable,
1731         ranges::basic_istream_view, ranges::istream_view): Define.
1732         * testsuite/std/ranges/istream_view: New test.
1733
1734         Implement C++20 range adaptors
1735         * include/std/ranges: Include <bits/refwrap.h> and <tuple>.
1736         (subrange::_S_store_size): Mark as const instead of constexpr to
1737         avoid what seems to be a bug in GCC.
1738         (__detail::__box): Give it defaulted copy and move constructors.
1739         (ranges::views::_Single::operator()): Mark constexpr.
1740         (ranges::views::_Iota::operator()): Mark constexpr.
1741         (__detail::Empty): Define.
1742         (ranges::views::__closure::_RangeAdaptor,
1743         ranges::views::__closure::_RangeAdaptorClosure, ref_view, all_view,
1744         ranges::views::all, ranges::__detail::find_if,
1745         ranges::__detail::find_if_not, ranges::__detail::mismatch,
1746         ranges::detail::min, filter_view, ranges::views::filter, transform_view,
1747         ranges::views::transform, take_view, ranges::views::take,
1748         take_while_view, ranges::views::take_while, drop_view,
1749         ranges::views::drop, join_view, ranges::views::join,
1750         __detail::require_constant, __detail::tiny_range, split_view,
1751         ranges::views::split, ranges::views::_Counted, ranges::views::counted,
1752         common_view, ranges::views::common, reverse_view,
1753         ranges::views::reverse,
1754         ranges::views::__detail::__is_reversible_subrange,
1755         ranges::views::__detail::__is_reverse_view, reverse_view,
1756         ranges::views::reverse, __detail::__has_tuple_element, elements_view,
1757         ranges::views::elements, ranges::views::keys, ranges::views::values):
1758         Define.
1759         (views): Alias for ranges::views.
1760         (tuple_size<ranges::subrange<>>, tuple_element<0, ranges::subrange>,
1761         tuple_element<1, ranges::subrange>): New partial specializations.
1762         * testsuite/std/ranges/adaptors/all.cc: New test.
1763         * testsuite/std/ranges/adaptors/common.cc: Likewise.
1764         * testsuite/std/ranges/adaptors/counted.cc: Likewise.
1765         * testsuite/std/ranges/adaptors/drop.cc: Likewise.
1766         * testsuite/std/ranges/adaptors/drop_while.cc: Likewise.
1767         * testsuite/std/ranges/adaptors/elements.cc: Likewise.
1768         * testsuite/std/ranges/adaptors/filter.cc: Likewise.
1769         * testsuite/std/ranges/adaptors/join.cc: Likewise.
1770         * testsuite/std/ranges/adaptors/reverse.cc: Likewise.
1771         * testsuite/std/ranges/adaptors/split.cc: Likewise.
1772         * testsuite/std/ranges/adaptors/take.cc: Likewise.
1773         * testsuite/std/ranges/adaptors/take_while.cc: Likewise.
1774         * testsuite/std/ranges/adaptors/transform.cc: Likewise.
1775
1776 2020-02-07  Jonathan Wakely  <jwakely@redhat.com>
1777
1778         * libsupc++/compare (__cmp_cat::type): Define typedef for underlying
1779         type of enumerations and comparison category types.
1780         (__cmp_cat::_Ord, __cmp_cat::_Ncmp): Add underlying type.
1781         (__cmp_cat::_Ncmp::unordered): Change value to 2.
1782         (partial_ordering::_M_value, weak_ordering::_M_value)
1783         (strong_ordering::_M_value): Change type to __cmp_cat::type.
1784         (partial_ordering::_M_is_ordered): Remove data member.
1785         (partial_ordering): Use second bit of _M_value for unordered. Adjust
1786         comparison operators.
1787         (weak_ordering::operator partial_ordering): Simplify to remove
1788         branches.
1789         (operator<=>(unspecified, weak_ordering)): Likewise.
1790         (strong_ordering::operator partial_ordering): Likewise.
1791         (strong_ordering::operator weak_ordering): Likewise.
1792         (operator<=>(unspecified, strong_ordering)): Likewise.
1793         * testsuite/18_support/comparisons/categories/partialord.cc: New test.
1794         * testsuite/18_support/comparisons/categories/strongord.cc: New test.
1795         * testsuite/18_support/comparisons/categories/weakord.cc: New test.
1796
1797         * include/std/ranges (iota_view::_Iterator): Fix typo in name of
1798         __cpp_lib_three_way_comparison macro and use deduced return type for
1799         operator<=>.
1800         * testsuite/std/ranges/iota/iterator.cc: New test.
1801
1802 2020-02-07  Patrick Palka  <ppalka@redhat.com>
1803             Jonathan Wakely  <jwakely@redhat.com>
1804
1805         Implement C++20 constrained algorithms
1806         * include/Makefile.am: Add new header.
1807         * include/Makefile.in: Regenerate.
1808         * include/std/algorithm: Include <bits/ranges_algo.h>.
1809         * include/bits/ranges_algo.h: New file.
1810         * testsuite/25_algorithms/adjacent_find/constrained.cc: New test.
1811         * testsuite/25_algorithms/all_of/constrained.cc: New test.
1812         * testsuite/25_algorithms/any_of/constrained.cc: New test.
1813         * testsuite/25_algorithms/binary_search/constrained.cc: New test.
1814         * testsuite/25_algorithms/copy/constrained.cc: New test.
1815         * testsuite/25_algorithms/copy_backward/constrained.cc: New test.
1816         * testsuite/25_algorithms/copy_if/constrained.cc: New test.
1817         * testsuite/25_algorithms/copy_n/constrained.cc: New test.
1818         * testsuite/25_algorithms/count/constrained.cc: New test.
1819         * testsuite/25_algorithms/count_if/constrained.cc: New test.
1820         * testsuite/25_algorithms/equal/constrained.cc: New test.
1821         * testsuite/25_algorithms/equal_range/constrained.cc: New test.
1822         * testsuite/25_algorithms/fill/constrained.cc: New test.
1823         * testsuite/25_algorithms/fill_n/constrained.cc: New test.
1824         * testsuite/25_algorithms/find/constrained.cc: New test.
1825         * testsuite/25_algorithms/find_end/constrained.cc: New test.
1826         * testsuite/25_algorithms/find_first_of/constrained.cc: New test.
1827         * testsuite/25_algorithms/find_if/constrained.cc: New test.
1828         * testsuite/25_algorithms/find_if_not/constrained.cc: New test.
1829         * testsuite/25_algorithms/for_each/constrained.cc: New test.
1830         * testsuite/25_algorithms/generate/constrained.cc: New test.
1831         * testsuite/25_algorithms/generate_n/constrained.cc: New test.
1832         * testsuite/25_algorithms/heap/constrained.cc: New test.
1833         * testsuite/25_algorithms/includes/constrained.cc: New test.
1834         * testsuite/25_algorithms/inplace_merge/constrained.cc: New test.
1835         * testsuite/25_algorithms/is_partitioned/constrained.cc: New test.
1836         * testsuite/25_algorithms/is_permutation/constrained.cc: New test.
1837         * testsuite/25_algorithms/is_sorted/constrained.cc: New test.
1838         * testsuite/25_algorithms/is_sorted_until/constrained.cc: New test.
1839         * testsuite/25_algorithms/lexicographical_compare/constrained.cc: New
1840         test.
1841         * testsuite/25_algorithms/lower_bound/constrained.cc: New test.
1842         * testsuite/25_algorithms/max/constrained.cc: New test.
1843         * testsuite/25_algorithms/max_element/constrained.cc: New test.
1844         * testsuite/25_algorithms/merge/constrained.cc: New test.
1845         * testsuite/25_algorithms/min/constrained.cc: New test.
1846         * testsuite/25_algorithms/min_element/constrained.cc: New test.
1847         * testsuite/25_algorithms/minmax/constrained.cc: New test.
1848         * testsuite/25_algorithms/minmax_element/constrained.cc: New test.
1849         * testsuite/25_algorithms/mismatch/constrained.cc: New test.
1850         * testsuite/25_algorithms/move/constrained.cc: New test.
1851         * testsuite/25_algorithms/move_backward/constrained.cc: New test.
1852         * testsuite/25_algorithms/next_permutation/constrained.cc: New test.
1853         * testsuite/25_algorithms/none_of/constrained.cc: New test.
1854         * testsuite/25_algorithms/nth_element/constrained.cc: New test.
1855         * testsuite/25_algorithms/partial_sort/constrained.cc: New test.
1856         * testsuite/25_algorithms/partial_sort_copy/constrained.cc: New test.
1857         * testsuite/25_algorithms/partition/constrained.cc: New test.
1858         * testsuite/25_algorithms/partition_copy/constrained.cc: New test.
1859         * testsuite/25_algorithms/partition_point/constrained.cc: New test.
1860         * testsuite/25_algorithms/prev_permutation/constrained.cc: New test.
1861         * testsuite/25_algorithms/remove/constrained.cc: New test.
1862         * testsuite/25_algorithms/remove_copy/constrained.cc: New test.
1863         * testsuite/25_algorithms/remove_copy_if/constrained.cc: New test.
1864         * testsuite/25_algorithms/remove_if/constrained.cc: New test.
1865         * testsuite/25_algorithms/replace/constrained.cc: New test.
1866         * testsuite/25_algorithms/replace_copy/constrained.cc: New test.
1867         * testsuite/25_algorithms/replace_copy_if/constrained.cc: New test.
1868         * testsuite/25_algorithms/replace_if/constrained.cc: New test.
1869         * testsuite/25_algorithms/reverse/constrained.cc: New test.
1870         * testsuite/25_algorithms/reverse_copy/constrained.cc: New test.
1871         * testsuite/25_algorithms/rotate/constrained.cc: New test.
1872         * testsuite/25_algorithms/rotate_copy/constrained.cc: New test.
1873         * testsuite/25_algorithms/search/constrained.cc: New test.
1874         * testsuite/25_algorithms/search_n/constrained.cc: New test.
1875         * testsuite/25_algorithms/set_difference/constrained.cc: New test.
1876         * testsuite/25_algorithms/set_intersection/constrained.cc: New test.
1877         * testsuite/25_algorithms/set_symmetric_difference/constrained.cc: New
1878         test.
1879         * testsuite/25_algorithms/set_union/constrained.cc: New test.
1880         * testsuite/25_algorithms/shuffle/constrained.cc: New test.
1881         * testsuite/25_algorithms/sort/constrained.cc: New test.
1882         * testsuite/25_algorithms/stable_partition/constrained.cc: New test.
1883         * testsuite/25_algorithms/stable_sort/constrained.cc: New test.
1884         * testsuite/25_algorithms/swap_ranges/constrained.cc: New test.
1885         * testsuite/25_algorithms/transform/constrained.cc: New test.
1886         * testsuite/25_algorithms/unique/constrained.cc: New test.
1887         * testsuite/25_algorithms/unique_copy/constrained.cc: New test.
1888         * testsuite/25_algorithms/upper_bound/constrained.cc: New test.
1889
1890 2020-02-06  Jonathan Wakely  <jwakely@redhat.com>
1891
1892         * include/bits/stl_iterator.h (__detail::__common_iter_ptr): Fix PR
1893         number in comment. Fix indentation.
1894
1895         * include/bits/stl_algobase.h (__iter_swap, __iter_swap<true>): Remove
1896         redundant _GLIBCXX20_CONSTEXPR.
1897
1898         * include/std/ranges (viewable_range): Replace decay_t with
1899         remove_cvref_t (LWG 3375).
1900
1901 2020-02-05  Jonathan Wakely  <jwakely@redhat.com>
1902
1903         * include/bits/iterator_concepts.h (iter_reference_t)
1904         (iter_rvalue_reference_t, iter_common_reference_t, indirect_result_t):
1905         Remove workarounds for PR c++/67704.
1906         * testsuite/24_iterators/aliases.cc: New test.
1907
1908 2020-02-05  Patrick Palka  <ppalka@redhat.com>
1909
1910         * include/bits/stl_iterator.h (move_iterator::move_iterator): Move __i
1911         when initializing _M_current.
1912         (move_iterator::base): Split into two overloads differing in
1913         ref-qualifiers as in P1207R4 for C++20.
1914
1915 2020-02-04  Jonathan Wakely  <jwakely@redhat.com>
1916
1917         * include/std/functional (_GLIBCXX_NOT_FN_CALL_OP): Un-define after
1918         use.
1919
1920         PR libstdc++/93562
1921         * include/bits/unique_ptr.h (__uniq_ptr_impl::swap): Define.
1922         (unique_ptr::swap, unique_ptr<T[], D>::swap): Call it.
1923         * testsuite/20_util/unique_ptr/modifiers/93562.cc: New test.
1924
1925 2020-02-01  Andrew Burgess  <andrew.burgess@embecosm.com>
1926
1927         * configure: Regenerate.
1928
1929 2020-01-31  Patrick Palka  <ppalka@redhat.com>
1930
1931         * testsuite/24_iterators/range_operations/distance.cc: Do not assume
1932         test_range::end() returns the same type as test_range::begin().
1933         * testsuite/24_iterators/range_operations/next.cc: Likewise.
1934         * testsuite/24_iterators/range_operations/prev.cc: Likewise.
1935         * testsuite/util/testsuite_iterators.h (__gnu_test::test_range::end):
1936         Always return a sentinel<I>.
1937
1938 2020-01-29  Jonathan Wakely  <jwakely@redhat.com>
1939
1940         PR libstdc++/92895
1941         * include/std/stop_token (stop_token::stop_possible()): Call new
1942         _M_stop_possible() function.
1943         (stop_token::stop_requested()): Do not use stop_possible().
1944         (stop_token::binary_semaphore): New class, as temporary stand-in for
1945         std::binary_semaphore.
1946         (stop_token::_Stop_cb::_M_callback): Add noexcept to type.
1947         (stop_token::_Stop_cb::_M_destroyed, stop_token::_Stop_cb::_M_done):
1948         New data members for symchronization with stop_callback destruction.
1949         (stop_token::_Stop_cb::_Stop_cb): Make non-template.
1950         (stop_token::_Stop_cb::_M_linked, stop_token::_Stop_cb::_S_execute):
1951         Remove.
1952         (stop_token::_Stop_cb::_M_run): New member function.
1953         (stop_token::_Stop_state::_M_stopped, stop_token::_Stop_state::_M_mtx):
1954         Remove.
1955         (stop_token::_Stop_state::_M_owners): New data member to track
1956         reference count for ownership.
1957         (stop_token::_Stop_state::_M_value): New data member combining a
1958         spinlock, the stop requested flag, and the reference count for
1959         associated stop_source objects.
1960         (stop_token::_Stop_state::_M_requester): New data member for
1961         synchronization with stop_callback destruction.
1962         (stop_token::_Stop_state::_M_stop_possible()): New member function.
1963         (stop_token::_Stop_state::_M_stop_requested()): Inspect relevant bit
1964         of _M_value.
1965         (stop_token::_Stop_state::_M_add_owner)
1966         (stop_token::_Stop_state::_M_release_ownership)
1967         (stop_token::_Stop_state::_M_add_ssrc)
1968         (stop_token::_Stop_state::_M_sub_ssrc): New member functions for
1969         updating reference counts.
1970         (stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
1971         (stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
1972         (stop_token::_Stop_state::_M_try_lock)
1973         (stop_token::_Stop_state::_M_try_lock_and_stop)
1974         (stop_token::_Stop_state::_M_do_try_lock): New member functions for
1975         managing spinlock.
1976         (stop_token::_Stop_state::_M_request_stop): Use atomic operations to
1977         read and update state. Release lock while running callbacks. Use new
1978         data members to synchronize with callback destruction.
1979         (stop_token::_Stop_state::_M_remove_callback): Likewise.
1980         (stop_token::_Stop_state::_M_register_callback): Use atomic operations
1981         to read and update state.
1982         (stop_token::_Stop_state_ref): Handle type to manage _Stop_state,
1983         replacing shared_ptr.
1984         (stop_source::stop_source(const stop_source&)): Update reference count.
1985         (stop_source::operator=(const stop_source&)): Likewise.
1986         (stop_source::~stop_source()): Likewise.
1987         (stop_source::stop_source(stop_source&&)): Define as defaulted.
1988         (stop_source::operator=(stop_source&&)): Establish postcondition on
1989         parameter.
1990         (stop_callback): Enforce preconditions on template parameter. Replace
1991         base class with data member of new _Cb_impl type.
1992         (stop_callback::stop_callback(const stop_token&, Cb&&))
1993         (stop_callback::stop_callback(stop_token&&, Cb&&)): Fix TOCTTOU race.
1994         (stop_callback::_Cb_impl): New type wrapping _Callback member and
1995         defining the _S_execute member function.
1996         * testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc: New
1997         test.
1998         * testsuite/30_threads/stop_token/stop_callback/deadlock.cc: New test.
1999         * testsuite/30_threads/stop_token/stop_callback/destroy.cc: New test.
2000         * testsuite/30_threads/stop_token/stop_callback/destructible_neg.cc:
2001         New test.
2002         * testsuite/30_threads/stop_token/stop_callback/invocable_neg.cc: New
2003         test.
2004         * testsuite/30_threads/stop_token/stop_callback/invoke.cc: New test.
2005         * testsuite/30_threads/stop_token/stop_source/assign.cc: New test.
2006         * testsuite/30_threads/stop_token/stop_token/stop_possible.cc: New
2007         test.
2008
2009         * libsupc++/compare (__detail::__3way_builtin_ptr_cmp): Use
2010         three_way_comparable_with.
2011         (__detail::__3way_cmp_with): Remove workaround for fixed bug.
2012         (compare_three_way::operator()): Remove redundant constraint from
2013         requires-clause.
2014         (__detail::_Synth3way::operator()): Use three_way_comparable_with
2015         instead of workaround.
2016         * testsuite/18_support/comparisons/object/93479.cc: Prune extra
2017         output due to simplified constraints on compare_three_way::operator().
2018
2019         PR libstdc++/93479
2020         * libsupc++/compare (__3way_builtin_ptr_cmp): Require <=> to be valid.
2021         * testsuite/18_support/comparisons/object/93479.cc: New test.
2022
2023         * testsuite/std/ranges/access/end.cc: Do not assume test_range::end()
2024         returns the same type as test_range::begin(). Add comments.
2025         * testsuite/std/ranges/access/rbegin.cc: Likewise.
2026         * testsuite/std/ranges/access/rend.cc: Likewise.
2027         * testsuite/std/ranges/range.cc: Do not assume the sentinel for
2028         test_range is the same as its iterator type.
2029         * testsuite/util/testsuite_iterators.h (test_range::sentinel): Add
2030         operator- overloads to satisfy sized_sentinel_for when the iterator
2031         satisfies random_access_iterator.
2032
2033 2020-01-28  Jonathan Wakely  <jwakely@redhat.com>
2034
2035         PR libstdc++/93470
2036         * include/bits/refwrap.h (reference_wrapper::operator()): Restrict
2037         static assertion to object types.
2038
2039         PR libstdc++/93325
2040         * acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Use AC_SEARCH_LIBS for
2041         clock_gettime instead of explicit glibc version check.
2042         * configure: Regenerate.
2043
2044 2020-01-28  Martin Liska  <mliska@suse.cz>
2045
2046         PR libstdc++/93478
2047         * include/std/atomic: Fix typo.
2048         * include/std/optional: Likewise.
2049
2050 2020-01-27  Andrew Burgess  <andrew.burgess@embecosm.com>
2051
2052         * configure: Regenerate.
2053
2054 2020-01-27  Jonathan Wakely  <jwakely@redhat.com>
2055
2056         PR libstdc++/93426
2057         * include/std/span (span): Fix deduction guide.
2058         * testsuite/23_containers/span/deduction.cc: New test.
2059
2060 2020-01-24  Jonathan Wakely  <jwakely@redhat.com>
2061
2062         * libsupc++/compare (__cmp_cat::_Eq): Remove enumeration type.
2063         (__cmp_cat::_Ord::equivalent): Add enumerator.
2064         (__cmp_cat::_Ord::_Less, __cmp_cat::_Ord::_Greater): Rename to less
2065         and greater.
2066         (partial_ordering, weak_ordering, strong_ordering): Remove
2067         constructors taking __cmp_cat::_Eq parameters. Use renamed
2068         enumerators.
2069
2070 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
2071
2072         * acinclude.m4: Handle `--with-toolexeclibdir='.
2073         * Makefile.in: Regenerate.
2074         * aclocal.m4: Regenerate.
2075         * configure: Regenerate.
2076         * doc/Makefile.in: Regenerate.
2077         * include/Makefile.in: Regenerate.
2078         * libsupc++/Makefile.in: Regenerate.
2079         * po/Makefile.in: Regenerate.
2080         * python/Makefile.in: Regenerate.
2081         * src/Makefile.in: Regenerate.
2082         * src/c++11/Makefile.in: Regenerate.
2083         * src/c++17/Makefile.in: Regenerate.
2084         * src/c++98/Makefile.in: Regenerate.
2085         * src/filesystem/Makefile.in: Regenerate.
2086         * testsuite/Makefile.in: Regenerate.
2087
2088 2020-01-23  Alexandre Oliva <oliva@adacore.com>
2089
2090         * crossconfig.m4 (GLIBCXX_CHECK_MATH_DECL): Reject macros.
2091         * configure: Rebuild.
2092
2093         * testsuite/27_io/fpos/mbstate_t/1.cc: Zero-init mbstate_t.
2094
2095 2020-01-23  Jonathan Wakely  <jwakely@redhat.com>
2096
2097         PR libstdc++/91947
2098         * include/Makefile.am (${host_builddir}/largefile-config.h): Simplify
2099         rule.
2100         * include/Makefile.in: Regenerate.
2101
2102 2020-01-20  Jonathan Wakely  <jwakely@redhat.com>
2103
2104         * doc/xml/faq.xml: Fix grammar.
2105         * doc/xml/manual/appendix_contributing.xml: Improve instructions.
2106         * doc/xml/manual/spine.xml: Update copyright years.
2107         * doc/html/*: Regenerate.
2108
2109 2020-01-19  Eric S. Raymond <esr@thyrsus.com>
2110
2111         * doc/xml/faq.xml: Update for SVN -> Git transition.
2112         * doc/xml/manual/appendix_contributing.xml: Likewise.
2113         * doc/xml/manual/status_cxx1998.xml: Likewise.
2114         * doc/xml/manual/status_cxx2011.xml: Likewise.
2115         * doc/xml/manual/status_cxx2014.xml: Likewise.
2116         * doc/xml/manual/status_cxx2017.xml: Likewise.
2117         * doc/xml/manual/status_cxx2020.xml: Likewise.
2118         * doc/xml/manual/status_cxxtr1.xml: Likewise.
2119         * doc/xml/manual/status_cxxtr24733.xml: Likewise.
2120
2121 2020-01-18  Iain Sandoe  <iain@sandoe.co.uk>
2122
2123         * include/Makefile.am: Add coroutine to the std set.
2124         * include/Makefile.in: Regenerated.
2125         * include/std/coroutine: New file.
2126
2127 2020-01-17  Jonathan Wakely  <jwakely@redhat.com>
2128
2129         PR libstdc++/92376
2130         * include/bits/c++config: Only do PSTL config when the header is
2131         present, to fix freestanding.
2132         * libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare allocation
2133         functions if they were detected by configure.
2134
2135 2020-01-16  Kai-Uwe Eckhardt  <kuehro@gmx.de>
2136             Matthew Bauer  <mjbauer95@gmail.com>
2137             Jonathan Wakely  <jwakely@redhat.com>
2138
2139         PR bootstrap/64271 (partial)
2140         * config/os/bsd/netbsd/ctype_base.h (ctype_base::mask): Change type
2141         to unsigned short.
2142         (ctype_base::alpha, ctype_base::digit, ctype_base::xdigit)
2143         (ctype_base::print, ctype_base::graph, ctype_base::alnum): Sync
2144         definitions with NetBSD upstream.
2145         (ctype_base::blank): Use _CTYPE_BL.
2146         * config/os/bsd/netbsd/ctype_configure_char.cc (_C_ctype_): Remove
2147         Declaration.
2148         (ctype<char>::classic_table): Use _C_ctype_tab_ instead of _C_ctype_.
2149         (ctype<char>::do_toupper, ctype<char>::do_tolower): Cast char
2150         parameters to unsigned char.
2151         * config/os/bsd/netbsd/ctype_inline.h (ctype<char>::is): Likewise.
2152
2153 2020-01-16  François Dumont  <fdumont@gcc.gnu.org>
2154
2155         PR libstdc++/91263
2156         * include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
2157         * include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
2158         (_Equality_base): Remove.
2159         (_Equality<>::_M_equal): Review implementation. Use
2160         std::is_permutation.
2161         * testsuite/23_containers/unordered_multiset/operators/1.cc
2162         (Hash, Equal, test02, test03): New.
2163         * testsuite/23_containers/unordered_set/operators/1.cc
2164         (Hash, Equal, test02, test03): New.
2165
2166 2020-01-15  Jonathan Wakely  <jwakely@redhat.com>
2167
2168         PR libstdc++/93267
2169         * include/bits/iterator_concepts.h (__max_diff_type, __max_size_type):
2170         Move here from <bits/range_access.h> and define using __int128 when
2171         available.
2172         (__is_integer_like, __is_signed_integer_like): Move here from
2173         <bits/range_access.h>.
2174         (weakly_incrementable): Use __is_signed_integer_like.
2175         * include/bits/range_access.h (__max_diff_type, __max_size_type)
2176         (__is_integer_like, __is_signed_integer_like): Move to
2177         <bits/iterator_concepts.h>.
2178         (__make_unsigned_like_t): Move here from <ranges>.
2179         * include/std/ranges (__make_unsigned_like_t): Move to
2180         <bits/range_access.h>.
2181         (iota_view): Replace using-directive with using-declarations.
2182         * testsuite/std/ranges/iota/93267.cc: New test.
2183         * testsuite/std/ranges/iota_view.cc: Move to new 'iota' sub-directory.
2184
2185 2020-01-13  Jonathan Wakely  <jwakely@redhat.com>
2186
2187         PR libstdc++/93244
2188         * include/bits/fs_path.h (path::generic_string<C,A>)
2189         [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Convert root-dir to forward-slash.
2190         * testsuite/27_io/filesystem/path/generic/generic_string.cc: Check
2191         root-dir is converted to forward slash in generic pathname.
2192         * testsuite/27_io/filesystem/path/generic/utf.cc: New test.
2193         * testsuite/27_io/filesystem/path/generic/wchar_t.cc: New test.
2194
2195         PR libstdc++/58605
2196         * include/bits/atomic_base.h (__cpp_lib_atomic_value_initialization):
2197         Define.
2198         (__atomic_flag_base, __atomic_base, __atomic_base<_PTp*>)
2199         (__atomic_float): Add default member initializer for C++20.
2200         * include/std/atomic (atomic): Likewise.
2201         (atomic::atomic()): Remove noexcept-specifier on default constructor.
2202         * include/std/version (__cpp_lib_atomic_value_initialization): Define.
2203         * testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error line
2204         number.
2205         * testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
2206         * testsuite/29_atomics/atomic/cons/value_init.cc: New test.
2207         * testsuite/29_atomics/atomic_flag/cons/value_init.cc: New test.
2208         * testsuite/29_atomics/atomic_flag/requirements/trivial.cc: Adjust
2209         expected result for is_trivially_default_constructible.
2210         * testsuite/29_atomics/atomic_float/requirements.cc: Likewise.
2211         * testsuite/29_atomics/atomic_float/value_init.cc: New test.
2212         * testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise.
2213         * testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
2214         * testsuite/29_atomics/atomic_integral/cons/value_init.cc
2215         * testsuite/29_atomics/atomic_integral/requirements/trivial.cc: Adjust
2216         expected results for is_trivially_default_constructible.
2217         * testsuite/util/testsuite_common_types.h (has_trivial_dtor): Add
2218         new test generator.
2219
2220 2020-01-10  Jonathan Wakely  <jwakely@redhat.com>
2221
2222         * testsuite/util/testsuite_iterators.h: Improve comment.
2223
2224         * testsuite/25_algorithms/equal/deque_iterators/1.cc: Don't use C++11
2225         initialization syntax.
2226
2227         PR libstdc++/92285
2228         * include/bits/streambuf_iterator.h (istreambuf_iterator): Make type
2229         of base class independent of __cplusplus value.
2230         [__cplusplus < 201103L] (istreambuf_iterator::reference): Override the
2231         type defined in the base class
2232         * testsuite/24_iterators/istreambuf_iterator/92285.cc: New test.
2233         * testsuite/24_iterators/istreambuf_iterator/requirements/
2234         base_classes.cc: Adjust expected base class for C++98.
2235
2236 2020-01-09  Olivier Hainque  <hainque@adacore.com>
2237
2238         * doc/xml/manual/appendix_contributing.xml: Document _C2
2239         as a reserved identifier, by VxWorks.
2240         * include/bits/stl_map.h: Rename _C2 template typenames as _Cmp2.
2241         * include/bits/stl_multimap.h: Likewise.
2242
2243 2020-01-09  Jonathan Wakely  <jwakely@redhat.com>
2244
2245         * include/ext/extptr_allocator.h (_ExtPtr_allocator::operator==)
2246         (_ExtPtr_allocator::operator!=): Add missing const qualifiers.
2247         * include/ext/pointer.h (readable_traits<_Pointer_adapter<S>>): Add
2248         partial specialization to disambiguate the two constrained
2249         specializations.
2250
2251         * include/experimental/type_traits (experimental::is_pod_v): Disable
2252         -Wdeprecated-declarations warnings around reference to std::is_pod.
2253         * include/std/type_traits (is_pod_v): Likewise.
2254         * testsuite/18_support/max_align_t/requirements/2.cc: Also check
2255         is_standard_layout and is_trivial. Do not check is_pod for C++20.
2256         * testsuite/20_util/is_pod/requirements/explicit_instantiation.cc:
2257         Add -Wno-deprecated for C++20.
2258         * testsuite/20_util/is_pod/requirements/typedefs.cc: Likewise.
2259         * testsuite/20_util/is_pod/value.cc: Likewise.
2260         * testsuite/experimental/type_traits/value.cc: Likewise.
2261
2262 2020-01-09  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>
2263
2264         * include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
2265         * include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
2266         * testuite/20_util/is_pod/deprecated-2a.cc: New test.
2267
2268 2020-01-09  Jonathan Wakely  <jwakely@redhat.com>
2269
2270         PR libstdc++/93205
2271         * include/bits/random.h (operator>>): Check stream operation succeeds.
2272         * include/bits/random.tcc (operator<<): Remove redundant __ostream_type
2273         typedefs.
2274         (operator>>): Remove redundant __istream_type typedefs. Check stream
2275         operations succeed.
2276         (__extract_params): New function to fill a vector from a stream.
2277         * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.
2278
2279         PR libstdc++/93208
2280         * config/abi/pre/gnu.ver: Add new exports.
2281         * include/std/memory_resource (memory_resource::~memory_resource()):
2282         Do not define inline.
2283         (monotonic_buffer_resource::~monotonic_buffer_resource()): Likewise.
2284         * src/c++17/memory_resource.cc (memory_resource::~memory_resource()):
2285         Define.
2286         (monotonic_buffer_resource::~monotonic_buffer_resource()): Define.
2287         * testsuite/20_util/monotonic_buffer_resource/93208.cc: New test.
2288
2289 2020-01-09  François Dumont  <fdumont@gcc.gnu.org>
2290
2291         PR libstdc++/92124
2292         * include/bits/hashtable.h (_Hashtable<>::__alloc_node_gen_t): New
2293         template alias.
2294         (_Hashtable<>::__fwd_value_for): New.
2295         (_Hashtable<>::_M_assign_elements<>): Remove _NodeGenerator template
2296         parameter.
2297         (_Hashtable<>::_M_assign<>): Add _Ht template parameter.
2298         (_Hashtable<>::operator=(const _Hashtable<>&)): Adapt.
2299         (_Hashtable<>::_M_move_assign): Adapt. Replace std::move_if_noexcept
2300         with std::move.
2301         (_Hashtable<>::_Hashtable(const _Hashtable&)): Adapt.
2302         (_Hashtable<>::_Hashtable(const _Hashtable&, const allocator_type&)):
2303         Adapt.
2304         (_Hashtable<>::_Hashtable(_Hashtable&&, const allocator_type&)):
2305         Adapt.
2306         * testsuite/23_containers/unordered_set/92124.cc: New.
2307
2308 2020-01-08  Jonathan Wakely  <jwakely@redhat.com>
2309
2310         PR libstdc++/93201
2311         * src/c++17/fs_ops.cc (do_remove_all): New function implementing more
2312         detailed error reporting for remove_all. Check result of recursive
2313         call before incrementing iterator.
2314         (remove_all(const path&), remove_all(const path&, error_code&)): Use
2315         do_remove_all.
2316         * src/filesystem/ops.cc (remove_all(const path&, error_code&)): Check
2317         result of recursive call before incrementing iterator.
2318         * testsuite/27_io/filesystem/operations/remove_all.cc: Check errors
2319         are reported correctly.
2320         * testsuite/experimental/filesystem/operations/remove_all.cc: Likewise.
2321
2322 2020-01-07  Thomas Rodgers  <trodgers@redhat.com>
2323
2324         * include/std/condition_variable
2325         (condition_variable_any::wait_on): Rename to match current draft
2326         standard.
2327         (condition_variable_any::wait_on_until): Likewise.
2328         (condition_variable_any::wait_on_for): Likewise.
2329         * testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
2330         Adjust tests to account for renamed methods.
2331
2332 2020-01-07  François Dumont  <fdumont@gcc.gnu.org>
2333
2334         PR libstdc++/92124
2335         * include/bits/stl_tree.h
2336         (_Rb_tree<>::_M_move_assign(_Rb_tree&, false_type)): Replace
2337         std::move_if_noexcept by std::move.
2338         * testsuite/23_containers/map/92124.cc: New.
2339         * testsuite/23_containers/set/92124.cc: New.
2340
2341 2020-01-06  Jonathan Wakely  <jwakely@redhat.com>
2342
2343         * include/std/stop_token (stop_token): Remove operator!= (LWG 3254).
2344         (stop_source): Likewise (LWG 3362).
2345         * testsuite/30_threads/stop_token/stop_source.cc: Test equality
2346         comparisons.
2347
2348         * include/bits/stl_algobase.h (__is_byte_iter, __min_cmp)
2349         (lexicographical_compare_three_way): Do not depend on
2350         __cpp_lib_concepts.
2351         * include/std/version (__cpp_lib_three_way_comparison): Only define
2352         when __cpp_lib_concepts is defined.
2353         * libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.
2354
2355 2020-01-03  Jonathan Wakely  <jwakely@redhat.com>
2356
2357         * include/bits/stl_algobase.h (lexicographical_compare_three_way):
2358         Only define four-argument overload when __cpp_lib_concepts is defined.
2359
2360 2020-01-01  John David Anglin  <danglin@gcc.gnu.org>
2361
2362         * config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.
2363
2364 2020-01-01  Jakub Jelinek  <jakub@redhat.com>
2365
2366         Update copyright years.
2367 \f
2368 Copyright (C) 2020 Free Software Foundation, Inc.
2369
2370 Copying and distribution of this file, with or without modification,
2371 are permitted in any medium without royalty provided the copyright
2372 notice and this notice are preserved.