libstdc++: enc_filebuf.h Source File

libstdc++

enc_filebuf.h
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1// filebuf with encoding state type -*- C++ -*-
2
3// Copyright (C) 2002-2026 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>
36#include <ext/codecvt_specializations.h>
37
38namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
39{
40_GLIBCXX_BEGIN_NAMESPACE_VERSION
41
42 /// class enc_filebuf.
43 template<typename _CharT>
44 class enc_filebuf
45 : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
46 {
47 public:
48 typedef encoding_char_traits<_CharT> traits_type;
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)
53 : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
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
fstream
locale
requires_hosted.h
codecvt_specializations.h
__gnu_cxx
GNU extensions for public use.
std::basic_filebuf
The actual work of input and output (for files).
Definition fstream:94
__gnu_cxx::encoding_char_traits
encoding_char_traits
Definition codecvt_specializations.h:215