3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
4 // Free Software Foundation, Inc.
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)
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.
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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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.
31 /** @file streambuf_iterator.h
32 * This is an internal header file, included by other library headers.
33 * You should not attempt to use it directly.
36 #ifndef _STREAMBUF_ITERATOR_H
37 #define _STREAMBUF_ITERATOR_H 1
39 #pragma GCC system_header
42 #include <debug/debug.h>
44 // NB: Should specialize copy, find algorithms for streambuf iterators.
48 // 24.5.3 Template class istreambuf_iterator
49 /// Provides input iterator semantics for streambufs.
50 template<typename _CharT, typename _Traits>
51 class istreambuf_iterator
52 : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
59 typedef _CharT char_type;
60 typedef _Traits traits_type;
61 typedef typename _Traits::int_type int_type;
62 typedef basic_streambuf<_CharT, _Traits> streambuf_type;
63 typedef basic_istream<_CharT, _Traits> istream_type;
67 // 24.5.3 istreambuf_iterator
69 // If the end of stream is reached (streambuf_type::sgetc()
70 // returns traits_type::eof()), the iterator becomes equal to
71 // the "end of stream" iterator value.
72 // NB: This implementation assumes the "end of stream" value
74 mutable streambuf_type* _M_sbuf;
75 mutable int_type _M_c;
78 /// Construct end of input stream iterator.
79 istreambuf_iterator() throw()
80 : _M_sbuf(0), _M_c(traits_type::eof()) { }
82 /// Construct start of input stream iterator.
83 istreambuf_iterator(istream_type& __s) throw()
84 : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
86 /// Construct start of streambuf iterator.
87 istreambuf_iterator(streambuf_type* __s) throw()
88 : _M_sbuf(__s), _M_c(traits_type::eof()) { }
90 /// Return the current character pointed to by iterator. This returns
91 /// streambuf.sgetc(). It cannot be assigned. NB: The result of
92 /// operator*() on an end of stream is undefined.
96 #ifdef _GLIBCXX_DEBUG_PEDANTIC
97 // Dereferencing a past-the-end istreambuf_iterator is a
98 // libstdc++ extension
99 __glibcxx_requires_cond(!_M_at_eof(),
100 _M_message(__gnu_debug::__msg_deref_istreambuf)
101 ._M_iterator(*this));
103 return traits_type::to_char_type(_M_get());
106 /// Advance the iterator. Calls streambuf.sbumpc().
110 __glibcxx_requires_cond(!_M_at_eof(),
111 _M_message(__gnu_debug::__msg_inc_istreambuf)
112 ._M_iterator(*this));
116 _M_c = traits_type::eof();
121 /// Advance the iterator. Calls streambuf.sbumpc().
125 __glibcxx_requires_cond(!_M_at_eof(),
126 _M_message(__gnu_debug::__msg_inc_istreambuf)
127 ._M_iterator(*this));
129 istreambuf_iterator __old = *this;
132 __old._M_c = _M_sbuf->sbumpc();
133 _M_c = traits_type::eof();
138 // _GLIBCXX_RESOLVE_LIB_DEFECTS
139 // 110 istreambuf_iterator::equal not const
140 // NB: there is also number 111 (NAD, Future) pending on this function.
141 /// Return true both iterators are end or both are not end.
143 equal(const istreambuf_iterator& __b) const
145 const bool __thiseof = _M_at_eof();
146 const bool __beof = __b._M_at_eof();
147 return (__thiseof && __beof || (!__thiseof && !__beof));
154 const int_type __eof = traits_type::eof();
155 int_type __ret = __eof;
158 if (!traits_type::eq_int_type(_M_c, __eof))
160 else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
172 const int_type __eof = traits_type::eof();
173 return traits_type::eq_int_type(_M_get(), __eof);
177 template<typename _CharT, typename _Traits>
179 operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
180 const istreambuf_iterator<_CharT, _Traits>& __b)
181 { return __a.equal(__b); }
183 template<typename _CharT, typename _Traits>
185 operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
186 const istreambuf_iterator<_CharT, _Traits>& __b)
187 { return !__a.equal(__b); }
189 /// Provides output iterator semantics for streambufs.
190 template<typename _CharT, typename _Traits>
191 class ostreambuf_iterator
192 : public iterator<output_iterator_tag, void, void, void, void>
198 typedef _CharT char_type;
199 typedef _Traits traits_type;
200 typedef basic_streambuf<_CharT, _Traits> streambuf_type;
201 typedef basic_ostream<_CharT, _Traits> ostream_type;
205 streambuf_type* _M_sbuf;
209 /// Construct output iterator from ostream.
210 ostreambuf_iterator(ostream_type& __s) throw ()
211 : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
213 /// Construct output iterator from streambuf.
214 ostreambuf_iterator(streambuf_type* __s) throw ()
215 : _M_sbuf(__s), _M_failed(!_M_sbuf) { }
217 /// Write character to streambuf. Calls streambuf.sputc().
219 operator=(_CharT __c)
222 _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
242 /// Return true if previous operator=() failed.
244 failed() const throw()
245 { return _M_failed; }
248 _M_put(const _CharT* __ws, streamsize __len)
250 if (__builtin_expect(!_M_failed, true)
251 && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,