stream_iterator.h

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00001 // Stream iterators 00002 00003 // Copyright (C) 2001 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00030 /** @file stream_iterator.h 00031 * This is an internal header file, included by other library headers. 00032 * You should not attempt to use it directly. 00033 */ 00034 00035 #ifndef _CPP_BITS_STREAM_ITERATOR_H 00036 #define _CPP_BITS_STREAM_ITERATOR_H 1 00037 00038 #pragma GCC system_header 00039 00040 namespace std 00041 { 00042 template<typename _Tp, typename _CharT = char, 00043 typename _Traits = char_traits<_CharT>, typename _Dist = ptrdiff_t> 00044 class istream_iterator 00045 : public iterator<input_iterator_tag, _Tp, _Dist, const _Tp*, const _Tp&> 00046 { 00047 public: 00048 typedef _CharT char_type; 00049 typedef _Traits traits_type; 00050 typedef basic_istream<_CharT, _Traits> istream_type; 00051 00052 private: 00053 istream_type* _M_stream; 00054 _Tp _M_value; 00055 bool _M_ok; 00056 00057 public: 00058 istream_iterator() : _M_stream(0), _M_ok(false) {} 00059 00060 istream_iterator(istream_type& __s) : _M_stream(&__s) { _M_read(); } 00061 00062 istream_iterator(const istream_iterator& __obj) 00063 : _M_stream(__obj._M_stream), _M_value(__obj._M_value), 00064 _M_ok(__obj._M_ok) 00065 { } 00066 00067 const _Tp& 00068 operator*() const { return _M_value; } 00069 00070 const _Tp* 00071 operator->() const { return &(operator*()); } 00072 00073 istream_iterator& 00074 operator++() 00075 { _M_read(); return *this; } 00076 00077 istream_iterator 00078 operator++(int) 00079 { 00080 istream_iterator __tmp = *this; 00081 _M_read(); 00082 return __tmp; 00083 } 00084 00085 bool 00086 _M_equal(const istream_iterator& __x) const 00087 { return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream);} 00088 00089 private: 00090 void 00091 _M_read() 00092 { 00093 _M_ok = (_M_stream && *_M_stream) ? true : false; 00094 if (_M_ok) 00095 { 00096 *_M_stream >> _M_value; 00097 _M_ok = *_M_stream ? true : false; 00098 } 00099 } 00100 }; 00101 00102 template<typename _Tp, typename _CharT, typename _Traits, typename _Dist> 00103 inline bool 00104 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x, 00105 const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y) 00106 { return __x._M_equal(__y); } 00107 00108 template <class _Tp, class _CharT, class _Traits, class _Dist> 00109 inline bool 00110 operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x, 00111 const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y) 00112 { return !__x._M_equal(__y); } 00113 00114 00115 template<typename _Tp, typename _CharT = char, 00116 typename _Traits = char_traits<_CharT> > 00117 class ostream_iterator 00118 : public iterator<output_iterator_tag, void, void, void, void> 00119 { 00120 public: 00121 typedef _CharT char_type; 00122 typedef _Traits traits_type; 00123 typedef basic_ostream<_CharT, _Traits> ostream_type; 00124 00125 private: 00126 ostream_type* _M_stream; 00127 const _CharT* _M_string; 00128 00129 public: 00130 ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {} 00131 00132 ostream_iterator(ostream_type& __s, const _CharT* __c) 00133 : _M_stream(&__s), _M_string(__c) { } 00134 00135 ostream_iterator(const ostream_iterator& __obj) 00136 : _M_stream(__obj._M_stream), _M_string(__obj._M_string) { } 00137 00138 ostream_iterator& 00139 operator=(const _Tp& __value) 00140 { 00141 *_M_stream << __value; 00142 if (_M_string) *_M_stream << _M_string; 00143 return *this; 00144 } 00145 00146 ostream_iterator& 00147 operator*() { return *this; } 00148 00149 ostream_iterator& 00150 operator++() { return *this; } 00151 00152 ostream_iterator& 00153 operator++(int) { return *this; } 00154 }; 00155 } // namespace std 00156 #endif

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