libstdc++
basic_file.h
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1 // Wrapper of C-language FILE struct -*- C++ -*-
2 
3 // Copyright (C) 2000-2018 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 //
26 // ISO C++ 14882: 27.8 File-based streams
27 //
28 
29 /** @file bits/basic_file.h
30  * This is an internal header file, included by other library headers.
31  * Do not attempt to use it directly. @headername{ios}
32  */
33 
34 #ifndef _GLIBCXX_BASIC_FILE_STDIO_H
35 #define _GLIBCXX_BASIC_FILE_STDIO_H 1
36 
37 #pragma GCC system_header
38 
39 #include <bits/c++config.h>
40 #include <bits/c++io.h> // for __c_lock and __c_file
41 #include <bits/move.h> // for swap
42 #include <ios>
43 
44 namespace std _GLIBCXX_VISIBILITY(default)
45 {
46 _GLIBCXX_BEGIN_NAMESPACE_VERSION
47 
48  // Generic declaration.
49  template<typename _CharT>
50  class __basic_file;
51 
52  // Specialization.
53  template<>
54  class __basic_file<char>
55  {
56  // Underlying data source/sink.
57  __c_file* _M_cfile;
58 
59  // True iff we opened _M_cfile, and thus must close it ourselves.
60  bool _M_cfile_created;
61 
62  public:
63  __basic_file(__c_lock* __lock = 0) throw ();
64 
65 #if __cplusplus >= 201103L
66  __basic_file(__basic_file&& __rv, __c_lock* = 0) noexcept
67  : _M_cfile(__rv._M_cfile), _M_cfile_created(__rv._M_cfile_created)
68  {
69  __rv._M_cfile = nullptr;
70  __rv._M_cfile_created = false;
71  }
72 
73  __basic_file& operator=(const __basic_file&) = delete;
74  __basic_file& operator=(__basic_file&&) = delete;
75 
76  void
77  swap(__basic_file& __f) noexcept
78  {
79  std::swap(_M_cfile, __f._M_cfile);
80  std::swap(_M_cfile_created, __f._M_cfile_created);
81  }
82 #endif
83 
84  __basic_file*
85  open(const char* __name, ios_base::openmode __mode, int __prot = 0664);
86 
87  __basic_file*
88  sys_open(__c_file* __file, ios_base::openmode);
89 
90  __basic_file*
91  sys_open(int __fd, ios_base::openmode __mode) throw ();
92 
93  __basic_file*
94  close();
95 
96  _GLIBCXX_PURE bool
97  is_open() const throw ();
98 
99  _GLIBCXX_PURE int
100  fd() throw ();
101 
102  _GLIBCXX_PURE __c_file*
103  file() throw ();
104 
105  ~__basic_file();
106 
107  streamsize
108  xsputn(const char* __s, streamsize __n);
109 
110  streamsize
111  xsputn_2(const char* __s1, streamsize __n1,
112  const char* __s2, streamsize __n2);
113 
114  streamsize
115  xsgetn(char* __s, streamsize __n);
116 
117  streamoff
118  seekoff(streamoff __off, ios_base::seekdir __way) throw ();
119 
120  int
121  sync();
122 
123  streamsize
124  showmanyc();
125  };
126 
127 _GLIBCXX_END_NAMESPACE_VERSION
128 } // namespace
129 
130 #endif
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:98
ISO C++ entities toplevel namespace is std.
long long streamoff
Type used by fpos, char_traits<char>, and char_traits<wchar_t>.
Definition: postypes.h:94
_Ios_Openmode openmode
This is a bitmask type.
Definition: ios_base.h:429