882 lines
28 KiB
C++
882 lines
28 KiB
C++
// String based streams -*- C++ -*-
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// Copyright (C) 1997-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/sstream
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* This is a Standard C++ Library header.
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*/
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//
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// ISO C++ 14882: 27.7 String-based streams
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//
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#ifndef _GLIBCXX_SSTREAM
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#define _GLIBCXX_SSTREAM 1
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#pragma GCC system_header
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#include <istream>
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#include <ostream>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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_GLIBCXX_BEGIN_NAMESPACE_CXX11
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// [27.7.1] template class basic_stringbuf
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/**
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* @brief The actual work of input and output (for std::string).
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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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*
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* This class associates either or both of its input and output sequences
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* with a sequence of characters, which can be initialized from, or made
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* available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.)
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*
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* For this class, open modes (of type @c ios_base::openmode) have
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* @c in set if the input sequence can be read, and @c out set if the
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* output sequence can be written.
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*/
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
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{
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struct __xfer_bufptrs;
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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typedef _Alloc allocator_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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typedef basic_streambuf<char_type, traits_type> __streambuf_type;
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typedef basic_string<char_type, _Traits, _Alloc> __string_type;
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typedef typename __string_type::size_type __size_type;
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protected:
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/// Place to stash in || out || in | out settings for current stringbuf.
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ios_base::openmode _M_mode;
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// Data Members:
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__string_type _M_string;
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public:
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// Constructors:
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/**
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* @brief Starts with an empty string buffer.
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*
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* The default constructor initializes the parent class using its
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* own default ctor.
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*/
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basic_stringbuf()
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: __streambuf_type(), _M_mode(ios_base::in | ios_base::out), _M_string()
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{ }
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/**
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* @brief Starts with an empty string buffer.
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* @param __mode Whether the buffer can read, or write, or both.
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*
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* The default constructor initializes the parent class using its
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* own default ctor.
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*/
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explicit
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basic_stringbuf(ios_base::openmode __mode)
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: __streambuf_type(), _M_mode(__mode), _M_string()
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{ }
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/**
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* @brief Starts with an existing string buffer.
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* @param __str A string to copy as a starting buffer.
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* @param __mode Whether the buffer can read, or write, or both.
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*
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* This constructor initializes the parent class using its
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* own default ctor.
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*/
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explicit
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basic_stringbuf(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in | ios_base::out)
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: __streambuf_type(), _M_mode(),
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_M_string(__str.data(), __str.size(), __str.get_allocator())
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{ _M_stringbuf_init(__mode); }
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#if __cplusplus >= 201103L
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basic_stringbuf(const basic_stringbuf&) = delete;
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basic_stringbuf(basic_stringbuf&& __rhs)
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: basic_stringbuf(std::move(__rhs), __xfer_bufptrs(__rhs, this))
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{ __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); }
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// 27.8.2.2 Assign and swap:
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basic_stringbuf&
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operator=(const basic_stringbuf&) = delete;
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basic_stringbuf&
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operator=(basic_stringbuf&& __rhs)
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{
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__xfer_bufptrs __st{__rhs, this};
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const __streambuf_type& __base = __rhs;
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__streambuf_type::operator=(__base);
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this->pubimbue(__rhs.getloc());
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_M_mode = __rhs._M_mode;
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_M_string = std::move(__rhs._M_string);
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__rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0);
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return *this;
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}
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void
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swap(basic_stringbuf& __rhs)
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{
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__xfer_bufptrs __l_st{*this, std::__addressof(__rhs)};
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__xfer_bufptrs __r_st{__rhs, this};
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__streambuf_type& __base = __rhs;
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__streambuf_type::swap(__base);
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__rhs.pubimbue(this->pubimbue(__rhs.getloc()));
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std::swap(_M_mode, __rhs._M_mode);
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std::swap(_M_string, __rhs._M_string);
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}
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#endif
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// Get and set:
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/**
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* @brief Copying out the string buffer.
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* @return A copy of one of the underlying sequences.
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*
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* <em>If the buffer is only created in input mode, the underlying
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* character sequence is equal to the input sequence; otherwise, it
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* is equal to the output sequence.</em> [27.7.1.2]/1
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*/
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__string_type
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str() const
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{
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__string_type __ret(_M_string.get_allocator());
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if (this->pptr())
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{
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// The current egptr() may not be the actual string end.
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if (this->pptr() > this->egptr())
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__ret.assign(this->pbase(), this->pptr());
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else
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__ret.assign(this->pbase(), this->egptr());
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}
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else
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__ret = _M_string;
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return __ret;
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}
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/**
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* @brief Setting a new buffer.
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* @param __s The string to use as a new sequence.
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*
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* Deallocates any previous stored sequence, then copies @a s to
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* use as a new one.
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*/
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void
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str(const __string_type& __s)
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{
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// Cannot use _M_string = __s, since v3 strings are COW
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// (not always true now but assign() always works).
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_M_string.assign(__s.data(), __s.size());
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_M_stringbuf_init(_M_mode);
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}
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protected:
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// Common initialization code goes here.
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void
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_M_stringbuf_init(ios_base::openmode __mode)
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{
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_M_mode = __mode;
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__size_type __len = 0;
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if (_M_mode & (ios_base::ate | ios_base::app))
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__len = _M_string.size();
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_M_sync(const_cast<char_type*>(_M_string.data()), 0, __len);
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}
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virtual streamsize
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showmanyc()
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{
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streamsize __ret = -1;
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if (_M_mode & ios_base::in)
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{
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_M_update_egptr();
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__ret = this->egptr() - this->gptr();
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}
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return __ret;
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}
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virtual int_type
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underflow();
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virtual int_type
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pbackfail(int_type __c = traits_type::eof());
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virtual int_type
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overflow(int_type __c = traits_type::eof());
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/**
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* @brief Manipulates the buffer.
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* @param __s Pointer to a buffer area.
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* @param __n Size of @a __s.
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* @return @c this
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*
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* If no buffer has already been created, and both @a __s and @a __n are
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* non-zero, then @c __s is used as a buffer; see
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* https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
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* for more.
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*/
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virtual __streambuf_type*
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setbuf(char_type* __s, streamsize __n)
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{
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if (__s && __n >= 0)
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{
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// This is implementation-defined behavior, and assumes
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// that an external char_type array of length __n exists
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// and has been pre-allocated. If this is not the case,
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// things will quickly blow up.
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// Step 1: Destroy the current internal array.
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_M_string.clear();
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// Step 2: Use the external array.
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_M_sync(__s, __n, 0);
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}
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return this;
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}
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virtual pos_type
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seekoff(off_type __off, ios_base::seekdir __way,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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virtual pos_type
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seekpos(pos_type __sp,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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// Internal function for correctly updating the internal buffer
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// for a particular _M_string, due to initialization or re-sizing
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// of an existing _M_string.
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void
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_M_sync(char_type* __base, __size_type __i, __size_type __o);
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// Internal function for correctly updating egptr() to the actual
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// string end.
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void
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_M_update_egptr()
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{
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const bool __testin = _M_mode & ios_base::in;
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if (this->pptr() && this->pptr() > this->egptr())
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{
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if (__testin)
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this->setg(this->eback(), this->gptr(), this->pptr());
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else
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this->setg(this->pptr(), this->pptr(), this->pptr());
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}
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}
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// Works around the issue with pbump, part of the protected
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// interface of basic_streambuf, taking just an int.
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void
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_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
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private:
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#if __cplusplus >= 201103L
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#if _GLIBCXX_USE_CXX11_ABI
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// This type captures the state of the gptr / pptr pointers as offsets
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// so they can be restored in another object after moving the string.
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struct __xfer_bufptrs
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{
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__xfer_bufptrs(const basic_stringbuf& __from, basic_stringbuf* __to)
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: _M_to{__to}, _M_goff{-1, -1, -1}, _M_poff{-1, -1, -1}
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{
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const _CharT* const __str = __from._M_string.data();
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const _CharT* __end = nullptr;
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if (__from.eback())
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{
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_M_goff[0] = __from.eback() - __str;
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_M_goff[1] = __from.gptr() - __str;
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_M_goff[2] = __from.egptr() - __str;
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__end = __from.egptr();
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}
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if (__from.pbase())
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{
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_M_poff[0] = __from.pbase() - __str;
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_M_poff[1] = __from.pptr() - __from.pbase();
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_M_poff[2] = __from.epptr() - __str;
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if (__from.pptr() > __end)
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__end = __from.pptr();
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}
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// Set _M_string length to the greater of the get and put areas.
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if (__end)
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{
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// The const_cast avoids changing this constructor's signature,
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// because it is exported from the dynamic library.
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auto& __mut_from = const_cast<basic_stringbuf&>(__from);
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__mut_from._M_string._M_length(__end - __str);
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}
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}
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~__xfer_bufptrs()
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{
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char_type* __str = const_cast<char_type*>(_M_to->_M_string.data());
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if (_M_goff[0] != -1)
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_M_to->setg(__str+_M_goff[0], __str+_M_goff[1], __str+_M_goff[2]);
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if (_M_poff[0] != -1)
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_M_to->_M_pbump(__str+_M_poff[0], __str+_M_poff[2], _M_poff[1]);
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}
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basic_stringbuf* _M_to;
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off_type _M_goff[3];
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off_type _M_poff[3];
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};
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#else
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// This type does nothing when using Copy-On-Write strings.
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struct __xfer_bufptrs
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{
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__xfer_bufptrs(const basic_stringbuf&, basic_stringbuf*) { }
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};
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#endif
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// The move constructor initializes an __xfer_bufptrs temporary then
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// delegates to this constructor to performs moves during its lifetime.
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basic_stringbuf(basic_stringbuf&& __rhs, __xfer_bufptrs&&)
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: __streambuf_type(static_cast<const __streambuf_type&>(__rhs)),
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_M_mode(__rhs._M_mode), _M_string(std::move(__rhs._M_string))
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{ }
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#endif
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};
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// [27.7.2] Template class basic_istringstream
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/**
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* @brief Controlling input for std::string.
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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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*
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* This class supports reading from objects of type std::basic_string,
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* using the inherited functions from std::basic_istream. To control
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* the associated sequence, an instance of std::basic_stringbuf is used,
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* which this page refers to as @c sb.
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*/
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_istringstream : public basic_istream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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typedef _Alloc allocator_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_istream<char_type, traits_type> __istream_type;
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private:
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors:
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/**
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* @brief Default constructor starts with an empty string buffer.
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*
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* Initializes @c sb using @c in, and passes @c &sb to the base
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* class initializer. Does not allocate any buffer.
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*
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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*/
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basic_istringstream()
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: __istream_type(), _M_stringbuf(ios_base::in)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief Starts with an empty string buffer.
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* @param __mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::in is automatically included in @a __mode.
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*
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* Initializes @c sb using @c __mode|in, and passes @c &sb to the base
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* class initializer. Does not allocate any buffer.
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*
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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*/
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explicit
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basic_istringstream(ios_base::openmode __mode)
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: __istream_type(), _M_stringbuf(__mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief Starts with an existing string buffer.
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* @param __str A string to copy as a starting buffer.
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* @param __mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::in is automatically included in @a mode.
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*
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* Initializes @c sb using @a str and @c mode|in, and passes @c &sb
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* to the base class initializer.
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*
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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*/
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explicit
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basic_istringstream(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in)
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: __istream_type(), _M_stringbuf(__str, __mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief The destructor does nothing.
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*
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* The buffer is deallocated by the stringbuf object, not the
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* formatting stream.
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*/
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~basic_istringstream()
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{ }
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#if __cplusplus >= 201103L
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basic_istringstream(const basic_istringstream&) = delete;
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basic_istringstream(basic_istringstream&& __rhs)
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: __istream_type(std::move(__rhs)),
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_M_stringbuf(std::move(__rhs._M_stringbuf))
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{ __istream_type::set_rdbuf(&_M_stringbuf); }
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// 27.8.3.2 Assign and swap:
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basic_istringstream&
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operator=(const basic_istringstream&) = delete;
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basic_istringstream&
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operator=(basic_istringstream&& __rhs)
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{
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__istream_type::operator=(std::move(__rhs));
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_M_stringbuf = std::move(__rhs._M_stringbuf);
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return *this;
|
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}
|
|
|
|
void
|
|
swap(basic_istringstream& __rhs)
|
|
{
|
|
__istream_type::swap(__rhs);
|
|
_M_stringbuf.swap(__rhs._M_stringbuf);
|
|
}
|
|
#endif
|
|
|
|
// Members:
|
|
/**
|
|
* @brief Accessing the underlying buffer.
|
|
* @return The current basic_stringbuf buffer.
|
|
*
|
|
* This hides both signatures of std::basic_ios::rdbuf().
|
|
*/
|
|
__stringbuf_type*
|
|
rdbuf() const
|
|
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Copying out the string buffer.
|
|
* @return @c rdbuf()->str()
|
|
*/
|
|
__string_type
|
|
str() const
|
|
{ return _M_stringbuf.str(); }
|
|
|
|
/**
|
|
* @brief Setting a new buffer.
|
|
* @param __s The string to use as a new sequence.
|
|
*
|
|
* Calls @c rdbuf()->str(s).
|
|
*/
|
|
void
|
|
str(const __string_type& __s)
|
|
{ _M_stringbuf.str(__s); }
|
|
};
|
|
|
|
|
|
// [27.7.3] Template class basic_ostringstream
|
|
/**
|
|
* @brief Controlling output for std::string.
|
|
* @ingroup io
|
|
*
|
|
* @tparam _CharT Type of character stream.
|
|
* @tparam _Traits Traits for character type, defaults to
|
|
* char_traits<_CharT>.
|
|
* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
|
|
*
|
|
* This class supports writing to objects of type std::basic_string,
|
|
* using the inherited functions from std::basic_ostream. To control
|
|
* the associated sequence, an instance of std::basic_stringbuf is used,
|
|
* which this page refers to as @c sb.
|
|
*/
|
|
template <typename _CharT, typename _Traits, typename _Alloc>
|
|
class basic_ostringstream : public basic_ostream<_CharT, _Traits>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef _CharT char_type;
|
|
typedef _Traits traits_type;
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 251. basic_stringbuf missing allocator_type
|
|
typedef _Alloc allocator_type;
|
|
typedef typename traits_type::int_type int_type;
|
|
typedef typename traits_type::pos_type pos_type;
|
|
typedef typename traits_type::off_type off_type;
|
|
|
|
// Non-standard types:
|
|
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
|
|
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
|
|
typedef basic_ostream<char_type, traits_type> __ostream_type;
|
|
|
|
private:
|
|
__stringbuf_type _M_stringbuf;
|
|
|
|
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.
|
|
*
|
|
* 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.
|
|
*/
|
|
explicit
|
|
basic_ostringstream(ios_base::openmode __mode)
|
|
: __ostream_type(), _M_stringbuf(__mode | ios_base::out)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Starts with an existing string buffer.
|
|
* @param __str A string to copy as a starting buffer.
|
|
* @param __mode Whether the buffer can read, or write, or both.
|
|
*
|
|
* @c ios_base::out is automatically included in @a mode.
|
|
*
|
|
* Initializes @c sb using @a str and @c mode|out, and passes @c &sb
|
|
* to the base class initializer.
|
|
*
|
|
* That's a lie. We initialize the base class with NULL, because the
|
|
* string class does its own memory management.
|
|
*/
|
|
explicit
|
|
basic_ostringstream(const __string_type& __str,
|
|
ios_base::openmode __mode = ios_base::out)
|
|
: __ostream_type(), _M_stringbuf(__str, __mode | ios_base::out)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief The destructor does nothing.
|
|
*
|
|
* The buffer is deallocated by the stringbuf object, not the
|
|
* formatting stream.
|
|
*/
|
|
~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
|
|
|
|
// Members:
|
|
/**
|
|
* @brief Accessing the underlying buffer.
|
|
* @return The current basic_stringbuf buffer.
|
|
*
|
|
* This hides both signatures of std::basic_ios::rdbuf().
|
|
*/
|
|
__stringbuf_type*
|
|
rdbuf() const
|
|
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Copying out the string buffer.
|
|
* @return @c rdbuf()->str()
|
|
*/
|
|
__string_type
|
|
str() const
|
|
{ return _M_stringbuf.str(); }
|
|
|
|
/**
|
|
* @brief Setting a new buffer.
|
|
* @param __s The string to use as a new sequence.
|
|
*
|
|
* Calls @c rdbuf()->str(s).
|
|
*/
|
|
void
|
|
str(const __string_type& __s)
|
|
{ _M_stringbuf.str(__s); }
|
|
};
|
|
|
|
|
|
// [27.7.4] Template class basic_stringstream
|
|
/**
|
|
* @brief Controlling input and output for std::string.
|
|
* @ingroup io
|
|
*
|
|
* @tparam _CharT Type of character stream.
|
|
* @tparam _Traits Traits for character type, defaults to
|
|
* char_traits<_CharT>.
|
|
* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
|
|
*
|
|
* This class supports reading from and writing to objects of type
|
|
* std::basic_string, using the inherited functions from
|
|
* std::basic_iostream. To control the associated sequence, an instance
|
|
* of std::basic_stringbuf is used, which this page refers to as @c sb.
|
|
*/
|
|
template <typename _CharT, typename _Traits, typename _Alloc>
|
|
class basic_stringstream : public basic_iostream<_CharT, _Traits>
|
|
{
|
|
public:
|
|
// Types:
|
|
typedef _CharT char_type;
|
|
typedef _Traits traits_type;
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 251. basic_stringbuf missing allocator_type
|
|
typedef _Alloc allocator_type;
|
|
typedef typename traits_type::int_type int_type;
|
|
typedef typename traits_type::pos_type pos_type;
|
|
typedef typename traits_type::off_type off_type;
|
|
|
|
// Non-standard Types:
|
|
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
|
|
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
|
|
typedef basic_iostream<char_type, traits_type> __iostream_type;
|
|
|
|
private:
|
|
__stringbuf_type _M_stringbuf;
|
|
|
|
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.
|
|
*
|
|
* 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)
|
|
: __iostream_type(), _M_stringbuf(__m)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Starts with an existing string buffer.
|
|
* @param __str A string to copy as a starting buffer.
|
|
* @param __m Whether the buffer can read, or write, or both.
|
|
*
|
|
* Initializes @c sb using @a __str and @c __m, and passes @c &sb
|
|
* to the base class initializer.
|
|
*
|
|
* That's a lie. We initialize the base class with NULL, because the
|
|
* string class does its own memory management.
|
|
*/
|
|
explicit
|
|
basic_stringstream(const __string_type& __str,
|
|
ios_base::openmode __m = ios_base::out | ios_base::in)
|
|
: __iostream_type(), _M_stringbuf(__str, __m)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief The destructor does nothing.
|
|
*
|
|
* The buffer is deallocated by the stringbuf object, not the
|
|
* formatting stream.
|
|
*/
|
|
~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
|
|
|
|
// Members:
|
|
/**
|
|
* @brief Accessing the underlying buffer.
|
|
* @return The current basic_stringbuf buffer.
|
|
*
|
|
* This hides both signatures of std::basic_ios::rdbuf().
|
|
*/
|
|
__stringbuf_type*
|
|
rdbuf() const
|
|
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Copying out the string buffer.
|
|
* @return @c rdbuf()->str()
|
|
*/
|
|
__string_type
|
|
str() const
|
|
{ return _M_stringbuf.str(); }
|
|
|
|
/**
|
|
* @brief Setting a new buffer.
|
|
* @param __s The string to use as a new sequence.
|
|
*
|
|
* Calls @c rdbuf()->str(s).
|
|
*/
|
|
void
|
|
str(const __string_type& __s)
|
|
{ _M_stringbuf.str(__s); }
|
|
};
|
|
|
|
#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
|
|
|
|
#include <bits/sstream.tcc>
|
|
|
|
#endif /* _GLIBCXX_SSTREAM */
|