// String based streams -*- C++ -*-
-// Copyright (C) 1997-2014 Free Software Foundation, Inc.
+// Copyright (C) 1997-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
+_GLIBCXX_BEGIN_NAMESPACE_CXX11
// [27.7.1] template class basic_stringbuf
/**
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
{
+ struct __xfer_bufptrs;
public:
// Types:
typedef _CharT char_type;
public:
// Constructors:
+
+ /**
+ * @brief Starts with an empty string buffer.
+ *
+ * The default constructor initializes the parent class using its
+ * own default ctor.
+ */
+ basic_stringbuf()
+ : __streambuf_type(), _M_mode(ios_base::in | ios_base::out), _M_string()
+ { }
+
/**
* @brief Starts with an empty string buffer.
* @param __mode Whether the buffer can read, or write, or both.
* own default ctor.
*/
explicit
- basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
+ basic_stringbuf(ios_base::openmode __mode)
: __streambuf_type(), _M_mode(__mode), _M_string()
{ }
explicit
basic_stringbuf(const __string_type& __str,
ios_base::openmode __mode = ios_base::in | ios_base::out)
- : __streambuf_type(), _M_mode(), _M_string(__str.data(), __str.size())
+ : __streambuf_type(), _M_mode(),
+ _M_string(__str.data(), __str.size(), __str.get_allocator())
{ _M_stringbuf_init(__mode); }
+#if __cplusplus >= 201103L
+ basic_stringbuf(const basic_stringbuf&) = delete;
+
+ basic_stringbuf(basic_stringbuf&& __rhs)
+ : basic_stringbuf(std::move(__rhs), __xfer_bufptrs(__rhs, this))
+ { __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); }
+
+ // 27.8.2.2 Assign and swap:
+
+ basic_stringbuf&
+ operator=(const basic_stringbuf&) = delete;
+
+ basic_stringbuf&
+ operator=(basic_stringbuf&& __rhs)
+ {
+ __xfer_bufptrs __st{__rhs, this};
+ const __streambuf_type& __base = __rhs;
+ __streambuf_type::operator=(__base);
+ this->pubimbue(__rhs.getloc());
+ _M_mode = __rhs._M_mode;
+ _M_string = std::move(__rhs._M_string);
+ __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0);
+ return *this;
+ }
+
+ void
+ swap(basic_stringbuf& __rhs)
+ {
+ __xfer_bufptrs __l_st{*this, std::__addressof(__rhs)};
+ __xfer_bufptrs __r_st{__rhs, this};
+ __streambuf_type& __base = __rhs;
+ __streambuf_type::swap(__base);
+ __rhs.pubimbue(this->pubimbue(__rhs.getloc()));
+ std::swap(_M_mode, __rhs._M_mode);
+ std::swap(_M_string, __rhs._M_string);
+ }
+#endif
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ explicit
+ basic_stringbuf(const allocator_type& __a)
+ : basic_stringbuf(ios_base::in | std::ios_base::out, __a)
+ { }
+
+ basic_stringbuf(ios_base::openmode __mode,
+ const allocator_type& __a)
+ : __streambuf_type(), _M_mode(__mode), _M_string(__a)
+ { }
+
+ explicit
+ basic_stringbuf(__string_type&& __s,
+ ios_base::openmode __mode = ios_base::in
+ | ios_base::out)
+ : __streambuf_type(), _M_mode(__mode), _M_string(std::move(__s))
+ { _M_stringbuf_init(__mode); }
+
+ template<typename _SAlloc>
+ basic_stringbuf(const basic_string<_CharT, _Traits, _SAlloc>& __s,
+ const allocator_type& __a)
+ : basic_stringbuf(__s, ios_base::in | std::ios_base::out, __a)
+ { }
+
+ template<typename _SAlloc>
+ basic_stringbuf(const basic_string<_CharT, _Traits, _SAlloc>& __s,
+ ios_base::openmode __mode,
+ const allocator_type& __a)
+ : __streambuf_type(), _M_mode(__mode),
+ _M_string(__s.data(), __s.size(), __a)
+ { _M_stringbuf_init(__mode); }
+
+ template<typename _SAlloc>
+ explicit
+ basic_stringbuf(const basic_string<_CharT, _Traits, _SAlloc>& __s,
+ ios_base::openmode __mode = ios_base::in
+ | ios_base::out)
+ : basic_stringbuf(__s, __mode, allocator_type{})
+ { }
+
+ basic_stringbuf(basic_stringbuf&& __rhs, const allocator_type& __a)
+ : basic_stringbuf(std::move(__rhs), __a, __xfer_bufptrs(__rhs, this))
+ { __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); }
+
+ allocator_type get_allocator() const noexcept
+ { return _M_string.get_allocator(); }
+#endif
+
// Get and set:
/**
* @brief Copying out the string buffer.
__string_type
str() const
{
- __string_type __ret;
- if (this->pptr())
+ __string_type __ret(_M_string.get_allocator());
+ if (char_type* __pptr = this->pptr())
{
+ char_type* __egptr = this->egptr();
// The current egptr() may not be the actual string end.
- if (this->pptr() > this->egptr())
- __ret = __string_type(this->pbase(), this->pptr());
+ if (!__egptr || __pptr > __egptr)
+ __ret.assign(this->pbase(), __pptr);
else
- __ret = __string_type(this->pbase(), this->egptr());
+ __ret.assign(this->pbase(), __egptr);
}
else
__ret = _M_string;
void
str(const __string_type& __s)
{
- // Cannot use _M_string = __s, since v3 strings are COW.
+ // Cannot use _M_string = __s, since v3 strings are COW
+ // (not always true now but assign() always works).
_M_string.assign(__s.data(), __s.size());
_M_stringbuf_init(_M_mode);
}
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_string_view<char_type, traits_type>
+ view() const noexcept
+ {
+ using __sv_type = basic_string_view<char_type, traits_type>;
+
+ if (this->pptr())
+ {
+ // The current egptr() may not be the actual string end.
+ if (this->pptr() > this->egptr())
+ return __sv_type(this->pbase(), this->pptr());
+ else
+ return __sv_type(this->pbase(), this->egptr());
+ }
+ else
+ return static_cast<__sv_type>(_M_string);
+ }
+#endif
+
protected:
// Common initialization code goes here.
void
virtual streamsize
showmanyc()
- {
+ {
streamsize __ret = -1;
if (_M_mode & ios_base::in)
{
*
* If no buffer has already been created, and both @a __s and @a __n are
* non-zero, then @c __s is used as a buffer; see
- * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
+ * https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
* for more.
*/
virtual __streambuf_type*
// that an external char_type array of length __n exists
// and has been pre-allocated. If this is not the case,
// things will quickly blow up.
-
+
// Step 1: Destroy the current internal array.
_M_string.clear();
-
+
// Step 2: Use the external array.
_M_sync(__s, __n, 0);
}
// interface of basic_streambuf, taking just an int.
void
_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
+
+ private:
+#if __cplusplus >= 201103L
+#if _GLIBCXX_USE_CXX11_ABI
+ // This type captures the state of the gptr / pptr pointers as offsets
+ // so they can be restored in another object after moving the string.
+ struct __xfer_bufptrs
+ {
+ __xfer_bufptrs(const basic_stringbuf& __from, basic_stringbuf* __to)
+ : _M_to{__to}, _M_goff{-1, -1, -1}, _M_poff{-1, -1, -1}
+ {
+ const _CharT* const __str = __from._M_string.data();
+ const _CharT* __end = nullptr;
+ if (__from.eback())
+ {
+ _M_goff[0] = __from.eback() - __str;
+ _M_goff[1] = __from.gptr() - __str;
+ _M_goff[2] = __from.egptr() - __str;
+ __end = __from.egptr();
+ }
+ if (__from.pbase())
+ {
+ _M_poff[0] = __from.pbase() - __str;
+ _M_poff[1] = __from.pptr() - __from.pbase();
+ _M_poff[2] = __from.epptr() - __str;
+ if (__from.pptr() > __end)
+ __end = __from.pptr();
+ }
+
+ // Set _M_string length to the greater of the get and put areas.
+ if (__end)
+ {
+ // The const_cast avoids changing this constructor's signature,
+ // because it is exported from the dynamic library.
+ auto& __mut_from = const_cast<basic_stringbuf&>(__from);
+ __mut_from._M_string._M_length(__end - __str);
+ }
+ }
+
+ ~__xfer_bufptrs()
+ {
+ char_type* __str = const_cast<char_type*>(_M_to->_M_string.data());
+ if (_M_goff[0] != -1)
+ _M_to->setg(__str+_M_goff[0], __str+_M_goff[1], __str+_M_goff[2]);
+ if (_M_poff[0] != -1)
+ _M_to->_M_pbump(__str+_M_poff[0], __str+_M_poff[2], _M_poff[1]);
+ }
+
+ basic_stringbuf* _M_to;
+ off_type _M_goff[3];
+ off_type _M_poff[3];
+ };
+#else
+ // This type does nothing when using Copy-On-Write strings.
+ struct __xfer_bufptrs
+ {
+ __xfer_bufptrs(const basic_stringbuf&, basic_stringbuf*) { }
+ };
+#endif
+
+ // The move constructor initializes an __xfer_bufptrs temporary then
+ // delegates to this constructor to performs moves during its lifetime.
+ basic_stringbuf(basic_stringbuf&& __rhs, __xfer_bufptrs&&)
+ : __streambuf_type(static_cast<const __streambuf_type&>(__rhs)),
+ _M_mode(__rhs._M_mode), _M_string(std::move(__rhs._M_string))
+ { }
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ // The move constructor initializes an __xfer_bufptrs temporary then
+ // delegates to this constructor to performs moves during its lifetime.
+ basic_stringbuf(basic_stringbuf&& __rhs, const allocator_type& __a,
+ __xfer_bufptrs&&)
+ : __streambuf_type(static_cast<const __streambuf_type&>(__rhs)),
+ _M_mode(__rhs._M_mode), _M_string(std::move(__rhs._M_string), __a)
+ { }
+#endif
+#endif
};
public:
// Constructors:
+
/**
* @brief Default constructor starts with an empty string buffer.
+ *
+ * Initializes @c sb using @c in, and passes @c &sb to the base
+ * class initializer. Does not allocate any buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ basic_istringstream()
+ : __istream_type(), _M_stringbuf(ios_base::in)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an empty string buffer.
* @param __mode Whether the buffer can read, or write, or both.
*
* @c ios_base::in is automatically included in @a __mode.
* string class does its own memory management.
*/
explicit
- basic_istringstream(ios_base::openmode __mode = ios_base::in)
+ basic_istringstream(ios_base::openmode __mode)
: __istream_type(), _M_stringbuf(__mode | ios_base::in)
{ this->init(&_M_stringbuf); }
~basic_istringstream()
{ }
+#if __cplusplus >= 201103L
+ basic_istringstream(const basic_istringstream&) = delete;
+
+ basic_istringstream(basic_istringstream&& __rhs)
+ : __istream_type(std::move(__rhs)),
+ _M_stringbuf(std::move(__rhs._M_stringbuf))
+ { __istream_type::set_rdbuf(&_M_stringbuf); }
+
+ // 27.8.3.2 Assign and swap:
+
+ basic_istringstream&
+ operator=(const basic_istringstream&) = delete;
+
+ basic_istringstream&
+ operator=(basic_istringstream&& __rhs)
+ {
+ __istream_type::operator=(std::move(__rhs));
+ _M_stringbuf = std::move(__rhs._M_stringbuf);
+ return *this;
+ }
+
+ void
+ swap(basic_istringstream& __rhs)
+ {
+ __istream_type::swap(__rhs);
+ _M_stringbuf.swap(__rhs._M_stringbuf);
+ }
+#endif
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_istringstream(ios_base::openmode __mode, const allocator_type& __a)
+ : __istream_type(), _M_stringbuf(__mode | ios_base::in, __a)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ explicit
+ basic_istringstream(__string_type&& __str,
+ ios_base::openmode __mode = ios_base::in)
+ : __istream_type(), _M_stringbuf(std::move(__str), __mode | ios_base::in)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ basic_istringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ const allocator_type& __a)
+ : basic_istringstream(__str, ios_base::in, __a)
+ { }
+
+ template<typename _SAlloc>
+ basic_istringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode,
+ const allocator_type& __a)
+ : __istream_type(), _M_stringbuf(__str, __mode | ios_base::in, __a)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ explicit
+ basic_istringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode = ios_base::in)
+ : basic_istringstream(__str, __mode, allocator_type())
+ { }
+#endif
+
// Members:
/**
* @brief Accessing the underlying buffer.
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_string_view<char_type, traits_type>
+ view() const noexcept
+ { return _M_stringbuf.view(); }
+#endif
};
public:
// Constructors/destructor:
+
/**
* @brief Default constructor starts with an empty string buffer.
+ *
+ * Initializes @c sb using @c mode|out, and passes @c &sb to the base
+ * class initializer. Does not allocate any buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ basic_ostringstream()
+ : __ostream_type(), _M_stringbuf(ios_base::out)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an empty string buffer.
* @param __mode Whether the buffer can read, or write, or both.
*
* @c ios_base::out is automatically included in @a mode.
* string class does its own memory management.
*/
explicit
- basic_ostringstream(ios_base::openmode __mode = ios_base::out)
+ basic_ostringstream(ios_base::openmode __mode)
: __ostream_type(), _M_stringbuf(__mode | ios_base::out)
{ this->init(&_M_stringbuf); }
~basic_ostringstream()
{ }
+#if __cplusplus >= 201103L
+ basic_ostringstream(const basic_ostringstream&) = delete;
+
+ basic_ostringstream(basic_ostringstream&& __rhs)
+ : __ostream_type(std::move(__rhs)),
+ _M_stringbuf(std::move(__rhs._M_stringbuf))
+ { __ostream_type::set_rdbuf(&_M_stringbuf); }
+
+ // 27.8.3.2 Assign and swap:
+
+ basic_ostringstream&
+ operator=(const basic_ostringstream&) = delete;
+
+ basic_ostringstream&
+ operator=(basic_ostringstream&& __rhs)
+ {
+ __ostream_type::operator=(std::move(__rhs));
+ _M_stringbuf = std::move(__rhs._M_stringbuf);
+ return *this;
+ }
+
+ void
+ swap(basic_ostringstream& __rhs)
+ {
+ __ostream_type::swap(__rhs);
+ _M_stringbuf.swap(__rhs._M_stringbuf);
+ }
+#endif
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_ostringstream(ios_base::openmode __mode, const allocator_type& __a)
+ : __ostream_type(), _M_stringbuf(__mode | ios_base::out, __a)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ explicit
+ basic_ostringstream(__string_type&& __str,
+ ios_base::openmode __mode = ios_base::out)
+ : __ostream_type(), _M_stringbuf(std::move(__str), __mode | ios_base::out)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ basic_ostringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ const allocator_type& __a)
+ : basic_ostringstream(__str, ios_base::out, __a)
+ { }
+
+ template<typename _SAlloc>
+ basic_ostringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode,
+ const allocator_type& __a)
+ : __ostream_type(), _M_stringbuf(__str, __mode | ios_base::out, __a)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ explicit
+ basic_ostringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode = ios_base::out)
+ : basic_ostringstream(__str, __mode, allocator_type())
+ { }
+#endif
+
// Members:
/**
* @brief Accessing the underlying buffer.
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_string_view<char_type, traits_type>
+ view() const noexcept
+ { return _M_stringbuf.view(); }
+#endif
};
public:
// Constructors/destructors
+
/**
* @brief Default constructor starts with an empty string buffer.
+ *
+ * Initializes @c sb using the mode @c in|out, and passes @c &sb
+ * to the base class initializer. Does not allocate any buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ basic_stringstream()
+ : __iostream_type(), _M_stringbuf(ios_base::out | ios_base::in)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an empty string buffer.
* @param __m Whether the buffer can read, or write, or both.
*
- * Initializes @c sb using the mode from @c __m, and passes @c
- * &sb to the base class initializer. Does not allocate any
- * buffer.
+ * Initializes @c sb using the mode from @c __m, and passes @c &sb
+ * to the base class initializer. Does not allocate any buffer.
*
* That's a lie. We initialize the base class with NULL, because the
* string class does its own memory management.
*/
explicit
- basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
+ basic_stringstream(ios_base::openmode __m)
: __iostream_type(), _M_stringbuf(__m)
{ this->init(&_M_stringbuf); }
~basic_stringstream()
{ }
+#if __cplusplus >= 201103L
+ basic_stringstream(const basic_stringstream&) = delete;
+
+ basic_stringstream(basic_stringstream&& __rhs)
+ : __iostream_type(std::move(__rhs)),
+ _M_stringbuf(std::move(__rhs._M_stringbuf))
+ { __iostream_type::set_rdbuf(&_M_stringbuf); }
+
+ // 27.8.3.2 Assign and swap:
+
+ basic_stringstream&
+ operator=(const basic_stringstream&) = delete;
+
+ basic_stringstream&
+ operator=(basic_stringstream&& __rhs)
+ {
+ __iostream_type::operator=(std::move(__rhs));
+ _M_stringbuf = std::move(__rhs._M_stringbuf);
+ return *this;
+ }
+
+ void
+ swap(basic_stringstream& __rhs)
+ {
+ __iostream_type::swap(__rhs);
+ _M_stringbuf.swap(__rhs._M_stringbuf);
+ }
+#endif
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_stringstream(ios_base::openmode __mode, const allocator_type& __a)
+ : __iostream_type(), _M_stringbuf(__mode, __a)
+ { this->init(&_M_stringbuf); }
+
+ explicit
+ basic_stringstream(__string_type&& __str,
+ ios_base::openmode __mode = ios_base::in
+ | ios_base::out)
+ : __iostream_type(), _M_stringbuf(std::move(__str), __mode)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ basic_stringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ const allocator_type& __a)
+ : basic_stringstream(__str, ios_base::in | ios_base::out, __a)
+ { }
+
+ template<typename _SAlloc>
+ basic_stringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode,
+ const allocator_type& __a)
+ : __iostream_type(), _M_stringbuf(__str, __mode, __a)
+ { this->init(std::__addressof(_M_stringbuf)); }
+
+ template<typename _SAlloc>
+ explicit
+ basic_stringstream(const basic_string<_CharT, _Traits, _SAlloc>& __str,
+ ios_base::openmode __mode = ios_base::in
+ | ios_base::out)
+ : basic_stringstream(__str, __mode, allocator_type())
+ { }
+#endif
+
// Members:
/**
* @brief Accessing the underlying buffer.
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
+
+#if __cplusplus > 201703L && _GLIBCXX_USE_CXX11_ABI
+ basic_string_view<char_type, traits_type>
+ view() const noexcept
+ { return _M_stringbuf.view(); }
+#endif
};
+#if __cplusplus >= 201103L
+ /// Swap specialization for stringbufs.
+ template <class _CharT, class _Traits, class _Allocator>
+ inline void
+ swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
+ basic_stringbuf<_CharT, _Traits, _Allocator>& __y)
+ { __x.swap(__y); }
+
+ /// Swap specialization for istringstreams.
+ template <class _CharT, class _Traits, class _Allocator>
+ inline void
+ swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
+ basic_istringstream<_CharT, _Traits, _Allocator>& __y)
+ { __x.swap(__y); }
+
+ /// Swap specialization for ostringstreams.
+ template <class _CharT, class _Traits, class _Allocator>
+ inline void
+ swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
+ basic_ostringstream<_CharT, _Traits, _Allocator>& __y)
+ { __x.swap(__y); }
+
+ /// Swap specialization for stringstreams.
+ template <class _CharT, class _Traits, class _Allocator>
+ inline void
+ swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
+ basic_stringstream<_CharT, _Traits, _Allocator>& __y)
+ { __x.swap(__y); }
+#endif
+
+_GLIBCXX_END_NAMESPACE_CXX11
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
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