libstdc++
enc_filebuf.h
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1 // filebuf with encoding state type -*- C++ -*-
2 
3 // Copyright (C) 2002-2024 Free Software Foundation, Inc.
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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /** @file ext/enc_filebuf.h
26  * This file is a GNU extension to the Standard C++ Library.
27  */
28 
29 #ifndef _EXT_ENC_FILEBUF_H
30 #define _EXT_ENC_FILEBUF_H 1
31 
32 #include <bits/requires_hosted.h> // GNU extensions are currently omitted
33 
34 #include <fstream>
35 #include <locale>
37 
38 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
39 {
40 _GLIBCXX_BEGIN_NAMESPACE_VERSION
41 
42  /// class enc_filebuf.
43  template<typename _CharT>
45  : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
46  {
47  public:
49  typedef typename traits_type::state_type state_type;
50  typedef typename traits_type::pos_type pos_type;
51 
52  enc_filebuf(state_type& __state)
54  { this->_M_state_beg = __state; }
55 
56  private:
57  // concept requirements:
58  // Set state type to something useful.
59  // Something more than copyconstructible is needed here, so
60  // require default and copy constructible + assignment operator.
61  __glibcxx_class_requires(state_type, _SGIAssignableConcept)
62  };
63 
64 _GLIBCXX_END_NAMESPACE_VERSION
65 } // namespace
66 
67 #endif
The actual work of input and output (for files).
Definition: fstream:90
class enc_filebuf.
Definition: enc_filebuf.h:44
_Traits traits_type
Definition: streambuf:134
GNU extensions for public use.
traits_type::pos_type pos_type
Definition: streambuf:136