1    	// <iosfwd> Forward declarations -*- C++ -*-
2    	
3    	// Copyright (C) 1997-2017 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 include/iosfwd
26   	 *  This is a Standard C++ Library header.
27   	 */
28   	
29   	//
30   	// ISO C++ 14882: 27.2  Forward declarations
31   	//
32   	
33   	#ifndef _GLIBCXX_IOSFWD
34   	#define _GLIBCXX_IOSFWD 1
35   	
36   	#pragma GCC system_header
37   	
38   	#include <bits/c++config.h>
39   	#include <bits/stringfwd.h> 	// For string forward declarations.
40   	#include <bits/postypes.h>
41   	
42   	namespace std _GLIBCXX_VISIBILITY(default)
43   	{
44   	_GLIBCXX_BEGIN_NAMESPACE_VERSION
45   	
46   	  /**
47   	   *  @defgroup io I/O
48   	   *
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.
53   	   *
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:
58   	   *
59   	   *  @code
60   	   *     typedef basic_ifstream<char>  ifstream;
61   	   *  @endcode
62   	   *
63   	   *  Because properly forward-declaring these classes can be difficult, you
64   	   *  should not do it yourself.  Instead, include the &lt;iosfwd&gt;
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++.
68   	   *
69   	   *  For more specific declarations, see
70   	   *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects
71   	   *
72   	   *  @{
73   	  */
74   	  class ios_base;
75   	
76   	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
77   	    class basic_ios;
78   	
79   	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
80   	    class basic_streambuf;
81   	
82   	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
83   	    class basic_istream;
84   	
85   	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
86   	    class basic_ostream;
87   	
88   	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
89   	    class basic_iostream;
90   	
91   	
92   	_GLIBCXX_BEGIN_NAMESPACE_CXX11
93   	
94   	  template<typename _CharT, typename _Traits = char_traits<_CharT>,
95   		    typename _Alloc = allocator<_CharT> >
96   	    class basic_stringbuf;
97   	
98   	  template<typename _CharT, typename _Traits = char_traits<_CharT>,
99   		   typename _Alloc = allocator<_CharT> >
100  	    class basic_istringstream;
101  	
102  	  template<typename _CharT, typename _Traits = char_traits<_CharT>,
103  		   typename _Alloc = allocator<_CharT> >
104  	    class basic_ostringstream;
105  	
106  	  template<typename _CharT, typename _Traits = char_traits<_CharT>,
107  		   typename _Alloc = allocator<_CharT> >
108  	    class basic_stringstream;
109  	
110  	_GLIBCXX_END_NAMESPACE_CXX11
111  	
112  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
113  	    class basic_filebuf;
114  	
115  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
116  	    class basic_ifstream;
117  	
118  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
119  	    class basic_ofstream;
120  	
121  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
122  	    class basic_fstream;
123  	
124  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
125  	    class istreambuf_iterator;
126  	
127  	  template<typename _CharT, typename _Traits = char_traits<_CharT> >
128  	    class ostreambuf_iterator;
129  	
130  	
131  	  /// Base class for @c char streams.
132  	  typedef basic_ios<char> 		ios;
133  	
134  	  /// Base class for @c char buffers.
135  	  typedef basic_streambuf<char> 	streambuf;
136  	
137  	  /// Base class for @c char input streams.
138  	  typedef basic_istream<char> 		istream;
139  	
140  	  /// Base class for @c char output streams.
141  	  typedef basic_ostream<char> 		ostream;
142  	
143  	  /// Base class for @c char mixed input and output streams.
144  	  typedef basic_iostream<char> 		iostream;
145  	
146  	  /// Class for @c char memory buffers.
147  	  typedef basic_stringbuf<char> 	stringbuf;
148  	
149  	  /// Class for @c char input memory streams.
150  	  typedef basic_istringstream<char> 	istringstream;
151  	
152  	  /// Class for @c char output memory streams.
153  	  typedef basic_ostringstream<char> 	ostringstream;
154  	
155  	  /// Class for @c char mixed input and output memory streams.
156  	  typedef basic_stringstream<char> 	stringstream;
157  	
158  	  /// Class for @c char file buffers.
159  	  typedef basic_filebuf<char> 		filebuf;
160  	
161  	  /// Class for @c char input file streams.
162  	  typedef basic_ifstream<char> 		ifstream;
163  	
164  	  /// Class for @c char output file streams.
165  	  typedef basic_ofstream<char> 		ofstream;
166  	
167  	  /// Class for @c char mixed input and output file streams.
168  	  typedef basic_fstream<char> 		fstream;
169  	
170  	#ifdef _GLIBCXX_USE_WCHAR_T
171  	  /// Base class for @c wchar_t streams.
172  	  typedef basic_ios<wchar_t> 		wios;
173  	
174  	  /// Base class for @c wchar_t buffers.
175  	  typedef basic_streambuf<wchar_t> 	wstreambuf;
176  	
177  	  /// Base class for @c wchar_t input streams.
178  	  typedef basic_istream<wchar_t> 	wistream;
179  	
180  	  /// Base class for @c wchar_t output streams.
181  	  typedef basic_ostream<wchar_t> 	wostream;
182  	
183  	  /// Base class for @c wchar_t mixed input and output streams.
184  	  typedef basic_iostream<wchar_t> 	wiostream;
185  	
186  	  /// Class for @c wchar_t memory buffers.
187  	  typedef basic_stringbuf<wchar_t> 	wstringbuf;
188  	
189  	  /// Class for @c wchar_t input memory streams.
190  	  typedef basic_istringstream<wchar_t> 	wistringstream;
191  	
192  	  /// Class for @c wchar_t output memory streams.
193  	  typedef basic_ostringstream<wchar_t> 	wostringstream;
194  	
195  	  /// Class for @c wchar_t mixed input and output memory streams.
196  	  typedef basic_stringstream<wchar_t> 	wstringstream;
197  	
198  	  /// Class for @c wchar_t file buffers.
199  	  typedef basic_filebuf<wchar_t> 	wfilebuf;
200  	
201  	  /// Class for @c wchar_t input file streams.
202  	  typedef basic_ifstream<wchar_t> 	wifstream;
203  	
204  	  /// Class for @c wchar_t output file streams.
205  	  typedef basic_ofstream<wchar_t> 	wofstream;
206  	
207  	  /// Class for @c wchar_t mixed input and output file streams.
208  	  typedef basic_fstream<wchar_t> 	wfstream;
209  	#endif
210  	  /** @}  */
211  	
212  	_GLIBCXX_END_NAMESPACE_VERSION
213  	} // namespace
214  	
215  	#endif /* _GLIBCXX_IOSFWD */
216