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1 | // Streambuf iterators |
2 | ||
b0a85b86 | 3 | // Copyright (C) 1997-2001 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 2, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING. If not, write to the Free | |
18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
19 | // USA. | |
20 | ||
21 | // As a special exception, you may use this file as part of a free software | |
22 | // library without restriction. Specifically, if other files instantiate | |
23 | // templates or use macros or inline functions from this file, or you compile | |
24 | // this file and link it with other files to produce an executable, this | |
25 | // file does not by itself cause the resulting executable to be covered by | |
26 | // the GNU General Public License. This exception does not however | |
27 | // invalidate any other reasons why the executable file might be covered by | |
28 | // the GNU General Public License. | |
29 | ||
30 | // XXX Should specialize copy, find algorithms for streambuf iterators. | |
31 | ||
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32 | #ifndef _CPP_BITS_STREAMBUF_ITERATOR_H |
33 | #define _CPP_BITS_STREAMBUF_ITERATOR_H 1 | |
725dc051 | 34 | |
b0a85b86 GDR |
35 | #pragma GCC system_header |
36 | ||
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37 | namespace std |
38 | { | |
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39 | template<typename _CharT, typename _Traits> |
40 | class ostreambuf_iterator | |
bfa1e6b1 | 41 | : public iterator<output_iterator_tag, void, void, void, void> |
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42 | { |
43 | public: | |
725dc051 | 44 | // Types: |
b85381b9 | 45 | typedef _CharT char_type; |
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46 | typedef _Traits traits_type; |
47 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
48 | typedef basic_ostream<_CharT, _Traits> ostream_type; | |
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49 | |
50 | private: | |
51 | streambuf_type* _M_sbuf; | |
52 | bool _M_failed; | |
53 | ||
54 | public: | |
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55 | inline |
56 | ostreambuf_iterator(ostream_type& __s) throw () | |
b85381b9 | 57 | : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } |
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58 | |
59 | ostreambuf_iterator(streambuf_type* __s) throw () | |
b85381b9 | 60 | : _M_sbuf(__s), _M_failed(!_M_sbuf) { } |
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61 | |
62 | ostreambuf_iterator& | |
63 | operator=(_CharT __c); | |
64 | ||
65 | ostreambuf_iterator& | |
66 | operator*() throw() | |
67 | { return *this; } | |
68 | ||
69 | ostreambuf_iterator& | |
70 | operator++(int) throw() | |
71 | { return *this; } | |
72 | ||
73 | ostreambuf_iterator& | |
74 | operator++() throw() | |
75 | { return *this; } | |
76 | ||
77 | bool | |
78 | failed() const throw() | |
79 | { return _M_failed; } | |
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80 | }; |
81 | ||
82 | template<typename _CharT, typename _Traits> | |
83 | inline ostreambuf_iterator<_CharT, _Traits>& | |
84 | ostreambuf_iterator<_CharT, _Traits>::operator=(_CharT __c) | |
85 | { | |
b85381b9 | 86 | if (!_M_failed && |
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87 | _Traits::eq_int_type(_M_sbuf->sputc(__c),_Traits::eof())) |
88 | _M_failed = true; | |
89 | return *this; | |
90 | } | |
91 | ||
92 | ||
725dc051 | 93 | // 24.5.3 Template class istreambuf_iterator |
39003c99 | 94 | template<typename _CharT, typename _Traits> |
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95 | class istreambuf_iterator |
96 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, | |
97 | _CharT*, _CharT&> | |
98 | { | |
99 | public: | |
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100 | // Types: |
101 | typedef _CharT char_type; | |
102 | typedef _Traits traits_type; | |
103 | typedef typename _Traits::int_type int_type; | |
104 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
105 | typedef basic_istream<_CharT, _Traits> istream_type; | |
725dc051 | 106 | |
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107 | private: |
108 | // 24.5.3 istreambuf_iterator | |
109 | // p 1 | |
110 | // If the end of stream is reached (streambuf_type::sgetc() | |
111 | // returns traits_type::eof()), the iterator becomes equal to | |
112 | // the "end of stream" iterator value. | |
113 | // NB: This implementation assumes the "end of stream" value | |
114 | // is EOF, or -1. | |
115 | streambuf_type* _M_sbuf; | |
116 | int_type _M_c; | |
117 | ||
118 | public: | |
725dc051 | 119 | istreambuf_iterator() throw() |
b85381b9 | 120 | : _M_sbuf(NULL), _M_c(-2) { } |
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121 | |
122 | istreambuf_iterator(istream_type& __s) throw() | |
b85381b9 | 123 | : _M_sbuf(__s.rdbuf()), _M_c(-2) { } |
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124 | |
125 | istreambuf_iterator(streambuf_type* __s) throw() | |
b85381b9 | 126 | : _M_sbuf(__s), _M_c(-2) { } |
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127 | |
128 | // NB: This should really have an int_type return | |
129 | // value, so "end of stream" postion can be checked without | |
130 | // hacking. | |
131 | char_type | |
132 | operator*() const | |
133 | { | |
134 | // The result of operator*() on an end of stream is undefined. | |
135 | char_type __ret; | |
b85381b9 | 136 | if (_M_sbuf && _M_c != static_cast<int_type>(-2)) |
725dc051 | 137 | __ret = _M_c; |
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138 | else if (_M_sbuf) |
139 | __ret = traits_type::to_char_type(_M_sbuf->sgetc()); | |
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140 | else |
141 | __ret = static_cast<char_type>(traits_type::eof()); | |
142 | return __ret; | |
143 | } | |
144 | ||
b581eaf7 | 145 | istreambuf_iterator& |
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146 | operator++() |
147 | { | |
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148 | if (_M_sbuf) |
149 | _M_sbuf->sbumpc(); | |
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150 | _M_c = -2; |
151 | return *this; | |
152 | } | |
153 | ||
b581eaf7 | 154 | istreambuf_iterator |
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155 | operator++(int) |
156 | { | |
b581eaf7 | 157 | istreambuf_iterator __old = *this; |
b85381b9 | 158 | if (_M_sbuf) |
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159 | __old._M_c = _M_sbuf->sbumpc(); |
160 | _M_c = -2; | |
161 | return __old; | |
725dc051 | 162 | } |
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163 | |
164 | bool | |
b581eaf7 | 165 | equal(const istreambuf_iterator& __b) |
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166 | { |
167 | int_type __eof = traits_type::eof(); | |
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168 | bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; |
169 | bool __beof = !__b._M_sbuf | |
170 | || __b._M_sbuf->sgetc() == __eof; | |
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171 | return (__thiseof && __beof || (!__thiseof && !__beof)); |
172 | } | |
173 | ||
174 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS | |
175 | // 110 istreambuf_iterator::equal not const | |
77cd227e | 176 | // NB: there is also number 111 (NAD, Future) pending on this function. |
725dc051 | 177 | bool |
b581eaf7 | 178 | equal(const istreambuf_iterator& __b) const |
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179 | { |
180 | int_type __eof = traits_type::eof(); | |
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181 | bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; |
182 | bool __beof = !__b._M_sbuf | |
183 | || __b._M_sbuf->sgetc() == __eof; | |
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184 | return (__thiseof && __beof || (!__thiseof && !__beof)); |
185 | } | |
186 | #endif | |
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187 | }; |
188 | ||
189 | template<typename _CharT, typename _Traits> | |
190 | inline bool | |
191 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, | |
192 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
193 | { return __a.equal(__b); } | |
194 | ||
195 | template<typename _CharT, typename _Traits> | |
196 | inline bool | |
197 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, | |
198 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
199 | { return !__a.equal(__b); } | |
b85381b9 | 200 | } // namespace std |
b85381b9 | 201 | #endif |