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Whole document tree                   std_sstream.h Go to the documentation of this file. // String based streams -*- C++ -*- // Copyright (C) 1997-1999 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. // // ISO C++ 14882: 27.7 String-based streams // #ifndef _CPP_SSTREAM #define _CPP_SSTREAM 1 #pragma GCC system_header #include <bits/std_istream.h> #include <bits/std_ostream.h> namespace std { template<typename _CharT, typename _Traits, typename _Alloc> class basic_stringbuf : public basic_streambuf<_CharT, _Traits> { public: // Types: typedef _CharT char_type; typedef _Traits traits_type; #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS // 251. basic_stringbuf missing allocator_type typedef _Alloc allocator_type; #endif 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_streambuf<char_type, traits_type> __streambuf_type; typedef basic_string<char_type, _Traits, _Alloc> __string_type; typedef typename __string_type::size_type __size_type; private: // Data Members: __string_type _M_string; public: // Constructors: explicit basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out) : __streambuf_type(), _M_string() { _M_stringbuf_init(__mode); } explicit basic_stringbuf(const __string_type& __str, ios_base::openmode __mode = ios_base::in | ios_base::out) : __streambuf_type(), _M_string(__str.data(), __str.size()) { _M_stringbuf_init(__mode); } // Get and set: __string_type str() const { if (_M_mode & ios_base::out) { // This is the deal: _M_string.size() is a value that // represents the size of the intial string that makes // _M_string, and may not be the correct size of the // current stringbuf internal buffer. __size_type __len = _M_string.size(); if (_M_out_cur > _M_out_beg) __len = max(__size_type(_M_out_end - _M_out_beg), __len); return __string_type(_M_out_beg, _M_out_beg + __len); } else return _M_string; } void str(const __string_type& __s) { _M_string = __s; _M_stringbuf_init(_M_mode); } protected: // Common initialization code for both ctors goes here. void _M_stringbuf_init(ios_base::openmode __mode) { // _M_buf_size is a convenient alias for "what the streambuf // thinks the allocated size of the string really is." This is // necessary as ostringstreams are implemented with the // streambufs having control of the allocation and // re-allocation of the internal string object, _M_string. _M_buf_size = _M_string.size(); // NB: Start ostringstream buffers at 512 bytes. This is an // experimental value (pronounced "arbitrary" in some of the // hipper english-speaking countries), and can be changed to // suite particular needs. _M_buf_size_opt = 512; _M_mode = __mode; if (_M_mode & ios_base::ate) _M_really_sync(0, _M_buf_size); else _M_really_sync(0, 0); } // Overridden virtual functions: virtual int_type underflow() { if (_M_in_cur && _M_in_cur < _M_in_end) return traits_type::to_int_type(*gptr()); else return traits_type::eof(); } virtual int_type pbackfail(int_type __c = traits_type::eof()); virtual int_type overflow(int_type __c = traits_type::eof()); virtual __streambuf_type* setbuf(char_type* __s, streamsize __n) { if (__s && __n) { _M_string = __string_type(__s, __n); _M_really_sync(0, 0); } return this; } virtual pos_type seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode = ios_base::in | ios_base::out); virtual pos_type seekpos(pos_type __sp, ios_base::openmode __mode = ios_base::in | ios_base::out); // Internal function for correctly updating the internal buffer // for a particular _M_string, due to initialization or // re-sizing of an existing _M_string. // Assumes: contents of _M_string and internal buffer match exactly. // __i == _M_in_cur - _M_in_beg // __o == _M_out_cur - _M_out_beg virtual int _M_really_sync(__size_type __i, __size_type __o) { char_type* __base = const_cast<char_type*>(_M_string.data()); bool __testin = _M_mode & ios_base::in; bool __testout = _M_mode & ios_base::out; __size_type __len = _M_string.size(); _M_buf = __base; if (__testin) this->setg(__base, __base + __i, __base + __len); if (__testout) { this->setp(__base, __base + __len); _M_out_cur += __o; } return 0; } }; // 27.7.2 Template class basic_istringstream template<typename _CharT, typename _Traits, typename _Alloc> class basic_istringstream : public basic_istream<_CharT, _Traits> { public: // Types: typedef _CharT char_type; typedef _Traits traits_type; #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS // 251. basic_stringbuf missing allocator_type typedef _Alloc allocator_type; #endif 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_istream<char_type, traits_type> __istream_type; private: __stringbuf_type _M_stringbuf; public: // Constructors: explicit basic_istringstream(ios_base::openmode __mode = ios_base::in) : __istream_type(NULL), _M_stringbuf(__mode | ios_base::in) { this->init(&_M_stringbuf); } explicit basic_istringstream(const __string_type& __str, ios_base::openmode __mode = ios_base::in) : __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in) { this->init(&_M_stringbuf); } ~basic_istringstream() { } // Members: __stringbuf_type* rdbuf() const { return const_cast<__stringbuf_type*>(&_M_stringbuf); } __string_type str() const { return _M_stringbuf.str(); } void str(const __string_type& __s) { _M_stringbuf.str(__s); } }; // 27.7.3 Template class basic_ostringstream 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; #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS // 251. basic_stringbuf missing allocator_type typedef _Alloc allocator_type; #endif 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: explicit basic_ostringstream(ios_base::openmode __mode = ios_base::out) : __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out) { this->init(&_M_stringbuf); } explicit basic_ostringstream(const __string_type __str, ios_base::openmode __mode = ios_base::out) : __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out) { this->init(&_M_stringbuf); } ~basic_ostringstream() { } // Members: __stringbuf_type* rdbuf() const { return const_cast<__stringbuf_type*>(&_M_stringbuf); } __string_type str() const { return _M_stringbuf.str(); } void str(const __string_type& __s) { _M_stringbuf.str(__s); } }; // 27.7.4 Template class basic_stringstream 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; #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS // 251. basic_stringbuf missing allocator_type typedef _Alloc allocator_type; #endif 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 explicit basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in) : __iostream_type(NULL), _M_stringbuf(__m) { this->init(&_M_stringbuf); } explicit basic_stringstream(const __string_type& __str, ios_base::openmode __m = ios_base::out | ios_base::in) : __iostream_type(NULL), _M_stringbuf(__str, __m) { this->init(&_M_stringbuf); } ~basic_stringstream() { } // Members: __stringbuf_type* rdbuf() const { return const_cast<__stringbuf_type*>(&_M_stringbuf); } __string_type str() const { return _M_stringbuf.str(); } void str(const __string_type& __s) { _M_stringbuf.str(__s); } }; } // namespace std #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT # define export #ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS # include <bits/sstream.tcc> #endif #endif #endif // _CPP_SSTREAM