1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
// Streambuf iterators
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
// 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.
/** @file streambuf_iterator.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _STREAMBUF_ITERATOR_H
#define _STREAMBUF_ITERATOR_H 1
#pragma GCC system_header
#include <streambuf>
#include <debug/debug.h>
// NB: Should specialize copy, find algorithms for streambuf iterators.
namespace std
{
// 24.5.3 Template class istreambuf_iterator
/// Provides input iterator semantics for streambufs.
template<typename _CharT, typename _Traits>
class istreambuf_iterator
: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
_CharT*, _CharT&>
{
public:
// Types:
//@{
/// Public typedefs
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;
//@}
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.
mutable streambuf_type* _M_sbuf;
int_type _M_c;
public:
/// Construct end of input stream iterator.
istreambuf_iterator() throw()
: _M_sbuf(0), _M_c(traits_type::eof()) { }
/// Construct start of input stream iterator.
istreambuf_iterator(istream_type& __s) throw()
: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
/// Construct start of streambuf iterator.
istreambuf_iterator(streambuf_type* __s) throw()
: _M_sbuf(__s), _M_c(traits_type::eof()) { }
/// Return the current character pointed to by iterator. This returns
/// streambuf.sgetc(). It cannot be assigned. NB: The result of
/// operator*() on an end of stream is undefined.
char_type
operator*() const
{
#ifdef _GLIBCXX_DEBUG_PEDANTIC
// Dereferencing a past-the-end istreambuf_iterator is a
// libstdc++ extension
__glibcxx_requires_cond(!_M_at_eof(),
_M_message(__gnu_debug::__msg_deref_istreambuf)
._M_iterator(*this));
#endif
return traits_type::to_char_type(_M_get());
}
/// Advance the iterator. Calls streambuf.sbumpc().
istreambuf_iterator&
operator++()
{
__glibcxx_requires_cond(!_M_at_eof(),
_M_message(__gnu_debug::__msg_inc_istreambuf)
._M_iterator(*this));
const int_type __eof = traits_type::eof();
if (_M_sbuf && traits_type::eq_int_type(_M_sbuf->sbumpc(), __eof))
_M_sbuf = 0;
else
_M_c = __eof;
return *this;
}
/// Advance the iterator. Calls streambuf.sbumpc().
istreambuf_iterator
operator++(int)
{
__glibcxx_requires_cond(!_M_at_eof(),
_M_message(__gnu_debug::__msg_inc_istreambuf)
._M_iterator(*this));
const int_type __eof = traits_type::eof();
istreambuf_iterator __old = *this;
if (_M_sbuf
&& traits_type::eq_int_type((__old._M_c = _M_sbuf->sbumpc()),
__eof))
_M_sbuf = 0;
else
_M_c = __eof;
return __old;
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 110 istreambuf_iterator::equal not const
// NB: there is also number 111 (NAD, Future) pending on this function.
/// Return true both iterators are end or both are not end.
bool
equal(const istreambuf_iterator& __b) const
{
const bool __thiseof = _M_at_eof();
const bool __beof = __b._M_at_eof();
return (__thiseof && __beof || (!__thiseof && !__beof));
}
private:
int_type
_M_get() const
{
const int_type __eof = traits_type::eof();
int_type __ret = __eof;
if (_M_sbuf)
{
if (!traits_type::eq_int_type(_M_c, __eof))
__ret = _M_c;
else if (traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
__eof))
_M_sbuf = 0;
}
return __ret;
}
bool
_M_at_eof() const
{
const int_type __eof = traits_type::eof();
return traits_type::eq_int_type(_M_get(), __eof);
}
};
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); }
/// Provides output iterator semantics for streambufs.
template<typename _CharT, typename _Traits>
class ostreambuf_iterator
: public iterator<output_iterator_tag, void, void, void, void>
{
public:
// Types:
//@{
/// Public typedefs
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:
/// Construct output iterator from ostream.
ostreambuf_iterator(ostream_type& __s) throw ()
: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
/// Construct output iterator from streambuf.
ostreambuf_iterator(streambuf_type* __s) throw ()
: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
/// Write character to streambuf. Calls streambuf.sputc().
ostreambuf_iterator&
operator=(_CharT __c)
{
if (!_M_failed &&
_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
_M_failed = true;
return *this;
}
/// Return *this.
ostreambuf_iterator&
operator*()
{ return *this; }
/// Return *this.
ostreambuf_iterator&
operator++(int)
{ return *this; }
/// Return *this.
ostreambuf_iterator&
operator++()
{ return *this; }
/// Return true if previous operator=() failed.
bool
failed() const throw()
{ return _M_failed; }
ostreambuf_iterator&
_M_put(const _CharT* __ws, streamsize __len)
{
if (__builtin_expect(!_M_failed, true)
&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
false))
_M_failed = true;
return *this;
}
};
} // namespace std
#endif
|
