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1 | // Streambuf iterators |
2 | ||
5c352a47 BK |
3 | // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 |
4 | // Free Software Foundation, Inc. | |
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5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 2, or (at your option) | |
10 | // any later version. | |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a copy of the GNU General Public License along | |
18 | // with this library; see the file COPYING. If not, write to the Free | |
19 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
20 | // USA. | |
21 | ||
22 | // As a special exception, you may use this file as part of a free software | |
23 | // library without restriction. Specifically, if other files instantiate | |
24 | // templates or use macros or inline functions from this file, or you compile | |
25 | // this file and link it with other files to produce an executable, this | |
26 | // file does not by itself cause the resulting executable to be covered by | |
27 | // the GNU General Public License. This exception does not however | |
28 | // invalidate any other reasons why the executable file might be covered by | |
29 | // the GNU General Public License. | |
30 | ||
31 | // XXX Should specialize copy, find algorithms for streambuf iterators. | |
32 | ||
729e3d3f PE |
33 | /** @file streambuf_iterator.h |
34 | * This is an internal header file, included by other library headers. | |
35 | * You should not attempt to use it directly. | |
36 | */ | |
37 | ||
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38 | #ifndef _CPP_BITS_STREAMBUF_ITERATOR_H |
39 | #define _CPP_BITS_STREAMBUF_ITERATOR_H 1 | |
725dc051 | 40 | |
b0a85b86 GDR |
41 | #pragma GCC system_header |
42 | ||
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43 | namespace std |
44 | { | |
725dc051 | 45 | // 24.5.3 Template class istreambuf_iterator |
39003c99 | 46 | template<typename _CharT, typename _Traits> |
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47 | class istreambuf_iterator |
48 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, | |
49 | _CharT*, _CharT&> | |
50 | { | |
51 | public: | |
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52 | // Types: |
53 | typedef _CharT char_type; | |
54 | typedef _Traits traits_type; | |
55 | typedef typename _Traits::int_type int_type; | |
56 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
57 | typedef basic_istream<_CharT, _Traits> istream_type; | |
725dc051 | 58 | |
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59 | private: |
60 | // 24.5.3 istreambuf_iterator | |
61 | // p 1 | |
62 | // If the end of stream is reached (streambuf_type::sgetc() | |
63 | // returns traits_type::eof()), the iterator becomes equal to | |
64 | // the "end of stream" iterator value. | |
65 | // NB: This implementation assumes the "end of stream" value | |
66 | // is EOF, or -1. | |
5c352a47 | 67 | mutable streambuf_type* _M_sbuf; |
39003c99 BK |
68 | int_type _M_c; |
69 | ||
70 | public: | |
725dc051 | 71 | istreambuf_iterator() throw() |
5c352a47 | 72 | : _M_sbuf(0), _M_c(-2) { } |
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73 | |
74 | istreambuf_iterator(istream_type& __s) throw() | |
b85381b9 | 75 | : _M_sbuf(__s.rdbuf()), _M_c(-2) { } |
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76 | |
77 | istreambuf_iterator(streambuf_type* __s) throw() | |
b85381b9 | 78 | : _M_sbuf(__s), _M_c(-2) { } |
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79 | |
80 | // NB: This should really have an int_type return | |
81 | // value, so "end of stream" postion can be checked without | |
82 | // hacking. | |
83 | char_type | |
84 | operator*() const | |
85 | { | |
86 | // The result of operator*() on an end of stream is undefined. | |
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87 | int_type __ret = traits_type::eof(); |
88 | if (_M_sbuf) | |
89 | { | |
90 | if (_M_c != static_cast<int_type>(-2)) | |
91 | __ret = _M_c; | |
92 | else | |
93 | if ((__ret = _M_sbuf->sgetc()) == traits_type::eof()) | |
94 | _M_sbuf = 0; | |
95 | } | |
96 | return traits_type::to_char_type(__ret); | |
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97 | } |
98 | ||
b581eaf7 | 99 | istreambuf_iterator& |
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100 | operator++() |
101 | { | |
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102 | if (_M_sbuf && _M_sbuf->sbumpc() == traits_type::eof()) |
103 | _M_sbuf = 0; | |
104 | else | |
105 | _M_c = -2; | |
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106 | return *this; |
107 | } | |
108 | ||
b581eaf7 | 109 | istreambuf_iterator |
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110 | operator++(int) |
111 | { | |
b581eaf7 | 112 | istreambuf_iterator __old = *this; |
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113 | if (_M_sbuf && (__old._M_c = _M_sbuf->sbumpc()) == traits_type::eof()) |
114 | _M_sbuf = 0; | |
115 | else | |
116 | _M_c = -2; | |
a85afd69 | 117 | return __old; |
725dc051 | 118 | } |
725dc051 | 119 | |
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120 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS |
121 | // 110 istreambuf_iterator::equal not const | |
77cd227e | 122 | // NB: there is also number 111 (NAD, Future) pending on this function. |
725dc051 | 123 | bool |
b581eaf7 | 124 | equal(const istreambuf_iterator& __b) const |
725dc051 | 125 | { |
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126 | const int_type __eof = traits_type::eof(); |
127 | bool __thiseof = traits_type::eq_int_type(this->operator*(), __eof); | |
128 | bool __beof = traits_type::eq_int_type(__b.operator*(), __eof); | |
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129 | return (__thiseof && __beof || (!__thiseof && !__beof)); |
130 | } | |
131 | #endif | |
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132 | }; |
133 | ||
134 | template<typename _CharT, typename _Traits> | |
135 | inline bool | |
136 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, | |
137 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
138 | { return __a.equal(__b); } | |
139 | ||
140 | template<typename _CharT, typename _Traits> | |
141 | inline bool | |
142 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, | |
143 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
144 | { return !__a.equal(__b); } | |
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145 | |
146 | template<typename _CharT, typename _Traits> | |
147 | class ostreambuf_iterator | |
148 | : public iterator<output_iterator_tag, void, void, void, void> | |
149 | { | |
150 | public: | |
151 | // Types: | |
152 | typedef _CharT char_type; | |
153 | typedef _Traits traits_type; | |
154 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
155 | typedef basic_ostream<_CharT, _Traits> ostream_type; | |
156 | ||
157 | private: | |
158 | streambuf_type* _M_sbuf; | |
159 | bool _M_failed; | |
160 | ||
161 | public: | |
162 | inline | |
163 | ostreambuf_iterator(ostream_type& __s) throw () | |
164 | : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } | |
165 | ||
166 | ostreambuf_iterator(streambuf_type* __s) throw () | |
167 | : _M_sbuf(__s), _M_failed(!_M_sbuf) { } | |
168 | ||
169 | ostreambuf_iterator& | |
170 | operator=(_CharT __c); | |
171 | ||
172 | ostreambuf_iterator& | |
173 | operator*() throw() | |
174 | { return *this; } | |
175 | ||
176 | ostreambuf_iterator& | |
177 | operator++(int) throw() | |
178 | { return *this; } | |
179 | ||
180 | ostreambuf_iterator& | |
181 | operator++() throw() | |
182 | { return *this; } | |
183 | ||
184 | bool | |
185 | failed() const throw() | |
186 | { return _M_failed; } | |
187 | }; | |
188 | ||
189 | template<typename _CharT, typename _Traits> | |
190 | inline ostreambuf_iterator<_CharT, _Traits>& | |
191 | ostreambuf_iterator<_CharT, _Traits>::operator=(_CharT __c) | |
192 | { | |
193 | if (!_M_failed && | |
194 | _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) | |
195 | _M_failed = true; | |
196 | return *this; | |
197 | } | |
b85381b9 | 198 | } // namespace std |
b85381b9 | 199 | #endif |