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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 | ||
32 | #ifndef _CPP_BITS_SBUF_ITER_H | |
33 | #define _CPP_BITS_SBUF_ITER_H 1 | |
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 | |
725dc051 | 41 | : public iterator<output_iterator_tag, _CharT, 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; | |
49 | ||
50 | inline | |
51 | ostreambuf_iterator(ostream_type& __s) throw () | |
b85381b9 | 52 | : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } |
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53 | |
54 | ostreambuf_iterator(streambuf_type* __s) throw () | |
b85381b9 | 55 | : _M_sbuf(__s), _M_failed(!_M_sbuf) { } |
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56 | |
57 | ostreambuf_iterator& | |
58 | operator=(_CharT __c); | |
59 | ||
60 | ostreambuf_iterator& | |
61 | operator*() throw() | |
62 | { return *this; } | |
63 | ||
64 | ostreambuf_iterator& | |
65 | operator++(int) throw() | |
66 | { return *this; } | |
67 | ||
68 | ostreambuf_iterator& | |
69 | operator++() throw() | |
70 | { return *this; } | |
71 | ||
72 | bool | |
73 | failed() const throw() | |
74 | { return _M_failed; } | |
75 | ||
76 | private: | |
77 | streambuf_type* _M_sbuf; | |
78 | bool _M_failed; | |
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79 | }; |
80 | ||
81 | template<typename _CharT, typename _Traits> | |
82 | inline ostreambuf_iterator<_CharT, _Traits>& | |
83 | ostreambuf_iterator<_CharT, _Traits>::operator=(_CharT __c) | |
84 | { | |
b85381b9 | 85 | if (!_M_failed && |
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86 | _Traits::eq_int_type(_M_sbuf->sputc(__c),_Traits::eof())) |
87 | _M_failed = true; | |
88 | return *this; | |
89 | } | |
90 | ||
91 | ||
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92 | // 24.5.3 Template class istreambuf_iterator |
93 | template<class _CharT, class _Traits> | |
94 | class istreambuf_iterator | |
95 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, | |
96 | _CharT*, _CharT&> | |
97 | { | |
98 | public: | |
99 | ||
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; | |
106 | // Non-standard Types: | |
107 | typedef istreambuf_iterator<_CharT, _Traits> __istreambufiter_type; | |
108 | ||
109 | istreambuf_iterator() throw() | |
b85381b9 | 110 | : _M_sbuf(NULL), _M_c(-2) { } |
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111 | |
112 | istreambuf_iterator(istream_type& __s) throw() | |
b85381b9 | 113 | : _M_sbuf(__s.rdbuf()), _M_c(-2) { } |
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114 | |
115 | istreambuf_iterator(streambuf_type* __s) throw() | |
b85381b9 | 116 | : _M_sbuf(__s), _M_c(-2) { } |
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117 | |
118 | // NB: This should really have an int_type return | |
119 | // value, so "end of stream" postion can be checked without | |
120 | // hacking. | |
121 | char_type | |
122 | operator*() const | |
123 | { | |
124 | // The result of operator*() on an end of stream is undefined. | |
125 | char_type __ret; | |
b85381b9 | 126 | if (_M_sbuf && _M_c != static_cast<int_type>(-2)) |
725dc051 | 127 | __ret = _M_c; |
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128 | else if (_M_sbuf) |
129 | __ret = traits_type::to_char_type(_M_sbuf->sgetc()); | |
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130 | else |
131 | __ret = static_cast<char_type>(traits_type::eof()); | |
132 | return __ret; | |
133 | } | |
134 | ||
135 | __istreambufiter_type& | |
136 | operator++() | |
137 | { | |
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138 | if (_M_sbuf) |
139 | _M_sbuf->sbumpc(); | |
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140 | _M_c = -2; |
141 | return *this; | |
142 | } | |
143 | ||
a85afd69 | 144 | __istreambufiter_type |
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145 | operator++(int) |
146 | { | |
a85afd69 | 147 | __istreambufiter_type __old = *this; |
b85381b9 | 148 | if (_M_sbuf) |
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149 | __old._M_c = _M_sbuf->sbumpc(); |
150 | _M_c = -2; | |
151 | return __old; | |
725dc051 | 152 | } |
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153 | |
154 | bool | |
155 | equal(const __istreambufiter_type& __b) | |
156 | { | |
157 | int_type __eof = traits_type::eof(); | |
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158 | bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; |
159 | bool __beof = !__b._M_sbuf | |
160 | || __b._M_sbuf->sgetc() == __eof; | |
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161 | return (__thiseof && __beof || (!__thiseof && !__beof)); |
162 | } | |
163 | ||
164 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS | |
165 | // 110 istreambuf_iterator::equal not const | |
166 | // NB: there is also number 111 pending on this function. | |
167 | bool | |
168 | equal(const __istreambufiter_type& __b) const | |
169 | { | |
170 | int_type __eof = traits_type::eof(); | |
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171 | bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof; |
172 | bool __beof = !__b._M_sbuf | |
173 | || __b._M_sbuf->sgetc() == __eof; | |
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174 | return (__thiseof && __beof || (!__thiseof && !__beof)); |
175 | } | |
176 | #endif | |
177 | ||
178 | private: | |
179 | // 24.5.3 istreambuf_iterator | |
180 | // p 1 | |
181 | // If the end of stream is reached (streambuf_type::sgetc() | |
182 | // returns traits_type::eof()), the iterator becomes equal to | |
183 | // the "end of stream" iterator value. | |
184 | // NB: This implementation assumes the "end of stream" value | |
185 | // is EOF, or -1. | |
b85381b9 | 186 | streambuf_type* _M_sbuf; |
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187 | int_type _M_c; |
188 | }; | |
189 | ||
190 | template<typename _CharT, typename _Traits> | |
191 | inline bool | |
192 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, | |
193 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
194 | { return __a.equal(__b); } | |
195 | ||
196 | template<typename _CharT, typename _Traits> | |
197 | inline bool | |
198 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, | |
199 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
200 | { return !__a.equal(__b); } | |
201 | ||
b85381b9 | 202 | } // namespace std |
725dc051 | 203 | |
b85381b9 | 204 | #endif |
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205 | |
206 | ||
207 |