1 // <iosfwd> Forward declarations -*- C++ -*-
3 // Copyright (C) 1997-2014 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file include/iosfwd
26 * This is a Standard C++ Library header.
30 // ISO C++ 14882: 27.2 Forward declarations
33 #ifndef _GLIBCXX_IOSFWD
34 #define _GLIBCXX_IOSFWD 1
36 #pragma GCC system_header
38 #include <bits/c++config.h>
39 #include <bits/stringfwd.h> // For string forward declarations.
40 #include <bits/postypes.h>
42 namespace std _GLIBCXX_VISIBILITY(default)
44 _GLIBCXX_BEGIN_NAMESPACE_VERSION
49 * Nearly all of the I/O classes are parameterized on the type of
50 * characters they read and write. (The major exception is ios_base at
51 * the top of the hierarchy.) This is a change from pre-Standard
52 * streams, which were not templates.
54 * For ease of use and compatibility, all of the basic_* I/O-related
55 * classes are given typedef names for both of the builtin character
56 * widths (wide and narrow). The typedefs are the same as the
57 * pre-Standard names, for example:
60 * typedef basic_ifstream<char> ifstream;
63 * Because properly forward-declaring these classes can be difficult, you
64 * should not do it yourself. Instead, include the <iosfwd>
65 * header, which contains only declarations of all the I/O classes as
66 * well as the typedefs. Trying to forward-declare the typedefs
67 * themselves (e.g., <code>class ostream;</code>) is not valid ISO C++.
69 * For more specific declarations, see
70 * https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects
76 template<typename _CharT, typename _Traits = char_traits<_CharT> >
79 template<typename _CharT, typename _Traits = char_traits<_CharT> >
80 class basic_streambuf;
82 template<typename _CharT, typename _Traits = char_traits<_CharT> >
85 template<typename _CharT, typename _Traits = char_traits<_CharT> >
88 template<typename _CharT, typename _Traits = char_traits<_CharT> >
91 template<typename _CharT, typename _Traits = char_traits<_CharT>,
92 typename _Alloc = allocator<_CharT> >
93 class basic_stringbuf;
95 template<typename _CharT, typename _Traits = char_traits<_CharT>,
96 typename _Alloc = allocator<_CharT> >
97 class basic_istringstream;
99 template<typename _CharT, typename _Traits = char_traits<_CharT>,
100 typename _Alloc = allocator<_CharT> >
101 class basic_ostringstream;
103 template<typename _CharT, typename _Traits = char_traits<_CharT>,
104 typename _Alloc = allocator<_CharT> >
105 class basic_stringstream;
107 template<typename _CharT, typename _Traits = char_traits<_CharT> >
110 template<typename _CharT, typename _Traits = char_traits<_CharT> >
111 class basic_ifstream;
113 template<typename _CharT, typename _Traits = char_traits<_CharT> >
114 class basic_ofstream;
116 template<typename _CharT, typename _Traits = char_traits<_CharT> >
119 template<typename _CharT, typename _Traits = char_traits<_CharT> >
120 class istreambuf_iterator;
122 template<typename _CharT, typename _Traits = char_traits<_CharT> >
123 class ostreambuf_iterator;
126 /// Base class for @c char streams.
127 typedef basic_ios<char> ios;
129 /// Base class for @c char buffers.
130 typedef basic_streambuf<char> streambuf;
132 /// Base class for @c char input streams.
133 typedef basic_istream<char> istream;
135 /// Base class for @c char output streams.
136 typedef basic_ostream<char> ostream;
138 /// Base class for @c char mixed input and output streams.
139 typedef basic_iostream<char> iostream;
141 /// Class for @c char memory buffers.
142 typedef basic_stringbuf<char> stringbuf;
144 /// Class for @c char input memory streams.
145 typedef basic_istringstream<char> istringstream;
147 /// Class for @c char output memory streams.
148 typedef basic_ostringstream<char> ostringstream;
150 /// Class for @c char mixed input and output memory streams.
151 typedef basic_stringstream<char> stringstream;
153 /// Class for @c char file buffers.
154 typedef basic_filebuf<char> filebuf;
156 /// Class for @c char input file streams.
157 typedef basic_ifstream<char> ifstream;
159 /// Class for @c char output file streams.
160 typedef basic_ofstream<char> ofstream;
162 /// Class for @c char mixed input and output file streams.
163 typedef basic_fstream<char> fstream;
165 #ifdef _GLIBCXX_USE_WCHAR_T
166 /// Base class for @c wchar_t streams.
167 typedef basic_ios<wchar_t> wios;
169 /// Base class for @c wchar_t buffers.
170 typedef basic_streambuf<wchar_t> wstreambuf;
172 /// Base class for @c wchar_t input streams.
173 typedef basic_istream<wchar_t> wistream;
175 /// Base class for @c wchar_t output streams.
176 typedef basic_ostream<wchar_t> wostream;
178 /// Base class for @c wchar_t mixed input and output streams.
179 typedef basic_iostream<wchar_t> wiostream;
181 /// Class for @c wchar_t memory buffers.
182 typedef basic_stringbuf<wchar_t> wstringbuf;
184 /// Class for @c wchar_t input memory streams.
185 typedef basic_istringstream<wchar_t> wistringstream;
187 /// Class for @c wchar_t output memory streams.
188 typedef basic_ostringstream<wchar_t> wostringstream;
190 /// Class for @c wchar_t mixed input and output memory streams.
191 typedef basic_stringstream<wchar_t> wstringstream;
193 /// Class for @c wchar_t file buffers.
194 typedef basic_filebuf<wchar_t> wfilebuf;
196 /// Class for @c wchar_t input file streams.
197 typedef basic_ifstream<wchar_t> wifstream;
199 /// Class for @c wchar_t output file streams.
200 typedef basic_ofstream<wchar_t> wofstream;
202 /// Class for @c wchar_t mixed input and output file streams.
203 typedef basic_fstream<wchar_t> wfstream;
207 _GLIBCXX_END_NAMESPACE_VERSION
210 #endif /* _GLIBCXX_IOSFWD */