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Whole document tree                   sbuf_iter.h Go to the documentation of this file. // Streambuf iterators // Copyright (C) 1997-2001 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. // XXX Should specialize copy, find algorithms for streambuf iterators. #ifndef _CPP_BITS_SBUF_ITER_H #define _CPP_BITS_SBUF_ITER_H 1 #pragma GCC system_header namespace std { template<typename _CharT, typename _Traits> class ostreambuf_iterator : public iterator<output_iterator_tag, void, void, void, void> { public: // Types: typedef _CharT char_type; typedef _Traits traits_type; typedef basic_streambuf<_CharT, _Traits> streambuf_type; typedef basic_ostream<_CharT, _Traits> ostream_type; private: streambuf_type* _M_sbuf; bool _M_failed; public: inline ostreambuf_iterator(ostream_type& __s) throw () : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } ostreambuf_iterator(streambuf_type* __s) throw () : _M_sbuf(__s), _M_failed(!_M_sbuf) { } ostreambuf_iterator& operator=(_CharT __c); ostreambuf_iterator& operator*() throw() { return *this; } ostreambuf_iterator& operator++(int) throw() { return *this; } ostreambuf_iterator& operator++() throw() { return *this; } bool failed() const throw() { return _M_failed; } }; template<typename _CharT, typename _Traits> inline ostreambuf_iterator<_CharT, _Traits>& ostreambuf_iterator<_CharT, _Traits>::operator=(_CharT __c) { if (!_M_failed && _Traits::eq_int_type(_M_sbuf->sputc(__c),_Traits::eof())) _M_failed = true; return *this; } // 24.5.3 Template class istreambuf_iterator template<typename _CharT, typename _Traits> class istreambuf_iterator : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&> { public: // Types: typedef _CharT char_type; typedef _Traits traits_type; typedef typename _Traits::int_type int_type; typedef basic_streambuf<_CharT, _Traits> streambuf_type; typedef basic_istream<_CharT, _Traits> istream_type; // Non-standard Types: typedef istreambuf_iterator<_CharT, _Traits> __istreambufiter_type; private: // 24.5.3 istreambuf_iterator // p 1 // If the end of stream is reached (streambuf_type::sgetc() // returns traits_type::eof()), the iterator becomes equal to // the "end of stream" iterator value. // NB: This implementation assumes the "end of stream" value // is EOF, or -1. streambuf_type* _M_sbuf; int_type _M_c; public: istreambuf_iterator() throw() : _M_sbuf(NULL), _M_c(-2) { } istreambuf_iterator(istream_type& __s) throw() : _M_sbuf(__s.rdbuf()), _M_c(-2) { } istreambuf_iterator(streambuf_type* __s) throw() : _M_sbuf(__s), _M_c(-2) { } // NB: This should really have an int_type return // value, so "end of stream" postion can be checked without // hacking. char_type operator*() const { // The result of operator*() on an end of stream is undefined. char_type __ret; if (_M_sbuf && _M_c != static_cast<int_type>(-2)) __ret = _M_c; else if (_M_sbuf) __ret = traits_type::to_char_type(_M_sbuf->sgetc()); else __ret = static_cast<char_type>(traits_type::eof()); return __ret; } __istreambufiter_type& operator++() { if (_M_sbuf) _M_sbuf->sbumpc(); _M_c = -2; return *this; } __istreambufiter_type operator++(int) { __istreambufiter_type __old = *this; if (_M_sbuf) __old._M_c = _M_sbuf->sbumpc(); _M_c = -2; return __old; } bool equal(const __istreambufiter_type& __b) { int_type __eof = traits_type::eof(); bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; bool __beof = !__b._M_sbuf || __b._M_sbuf->sgetc() == __eof; return (__thiseof && __beof || (!__thiseof && !__beof)); } #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS // 110 istreambuf_iterator::equal not const // NB: there is also number 111 pending on this function. bool equal(const __istreambufiter_type& __b) const { int_type __eof = traits_type::eof(); bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; bool __beof = !__b._M_sbuf || __b._M_sbuf->sgetc() == __eof; return (__thiseof && __beof || (!__thiseof && !__beof)); } #endif }; template<typename _CharT, typename _Traits> inline bool operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { return __a.equal(__b); } template<typename _CharT, typename _Traits> inline bool operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { return !__a.equal(__b); } } // namespace std #endif