# iosfwd

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    00001 // Forwarding declarations -*- C++ -*-
    00002
    00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    00004 // 2006, 2007
    00005 // Free Software Foundation, Inc.
    00006 //
    00007 // This file is part of the GNU ISO C++ Library.  This library is free
    00008 // software; you can redistribute it and/or modify it under the
    00009 // terms of the GNU General Public License as published by the
    00010 // Free Software Foundation; either version 2, or (at your option)
    00011 // any later version.
    00012
    00013 // This library is distributed in the hope that it will be useful,
    00014 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00016 // GNU General Public License for more details.
    00017
    00018 // You should have received a copy of the GNU General Public License
    00019 // along with this library; see the file COPYING.  If not, write to
    00020 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
    00021 // Boston, MA 02110-1301, USA.
    00022
    00023 // As a special exception, you may use this file as part of a free software
    00024 // library without restriction.  Specifically, if other files instantiate
    00025 // templates or use macros or inline functions from this file, or you compile
    00026 // this file and link it with other files to produce an executable, this
    00027 // file does not by itself cause the resulting executable to be covered by
    00028 // the GNU General Public License.  This exception does not however
    00029 // invalidate any other reasons why the executable file might be covered by
    00030 // the GNU General Public License.
    00031
    00032 /** @file iosfwd
    00033  *  This is a Standard C++ Library header.
    00034  */
    00035
    00036 //
    00037 // ISO C++ 14882: 27.2  Forward declarations
    00038 //
    00039
    00040 #ifndef _GLIBCXX_IOSFWD
    00041 #define _GLIBCXX_IOSFWD 1
    00042
    00043 #pragma GCC system_header
    00044
    00045 #include <bits/c++config.h>
    00046 #include <bits/stringfwd.h>     // For string forward declarations.
    00047 #include <bits/postypes.h>
    00048
    00049 _GLIBCXX_BEGIN_NAMESPACE(std)
    00050
    00051   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00052     class basic_ios;
    00053
    00054   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00055     class basic_streambuf;
    00056
    00057   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00058     class basic_istream;
    00059
    00060   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00061     class basic_ostream;
    00062
    00063   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00064     class basic_iostream;
    00065
    00066   template<typename _CharT, typename _Traits = char_traits<_CharT>,
    00067         typename _Alloc = allocator<_CharT> >
    00068     class basic_stringbuf;
    00069
    00070   template<typename _CharT, typename _Traits = char_traits<_CharT>,
    00071        typename _Alloc = allocator<_CharT> >
    00072     class basic_istringstream;
    00073
    00074   template<typename _CharT, typename _Traits = char_traits<_CharT>,
    00075        typename _Alloc = allocator<_CharT> >
    00076     class basic_ostringstream;
    00077
    00078   template<typename _CharT, typename _Traits = char_traits<_CharT>,
    00079        typename _Alloc = allocator<_CharT> >
    00080     class basic_stringstream;
    00081
    00082   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00083     class basic_filebuf;
    00084
    00085   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00086     class basic_ifstream;
    00087
    00088   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00089     class basic_ofstream;
    00090
    00091   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00092     class basic_fstream;
    00093
    00094   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00095     class istreambuf_iterator;
    00096
    00097   template<typename _CharT, typename _Traits = char_traits<_CharT> >
    00098     class ostreambuf_iterator;
    00099
    00100   // _GLIBCXX_RESOLVE_LIB_DEFECTS
    00101   // Not included.   (??? Apparently no LWG number?)
    00102   class ios_base;
    00103
    00104   /**
    00105    *  @defgroup s27_2_iosfwd I/O Forward Declarations
    00106    *
    00107    *  Nearly all of the I/O classes are parameterized on the type of
    00108    *  characters they read and write.  (The major exception is ios_base at
    00109    *  the top of the hierarchy.)  This is a change from pre-Standard
    00110    *  streams, which were not templates.
    00111    *
    00112    *  For ease of use and compatibility, all of the basic_* I/O-related
    00113    *  classes are given typedef names for both of the builtin character
    00114    *  widths (wide and narrow).  The typedefs are the same as the
    00115    *  pre-Standard names, for example:
    00116    *
    00117    *  @code
    00118    *     typedef basic_ifstream<char>  ifstream;
    00119    *  @endcode
    00120    *
    00121    *  Because properly forward-declaring these classes can be difficult, you
    00122    *  should not do it yourself.  Instead, include the &lt;iosfwd&gt;
    00123    *  header, which contains only declarations of all the I/O classes as
    00124    *  well as the typedefs.  Trying to forward-declare the typedefs
    00125    *  themselves (e.g., "class ostream;") is not valid ISO C++.
    00126    *
    00127    *  For more specific declarations, see
    00128    *  http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#10
    00129    *
    00130    *  @{
    00131   */
    00132   typedef basic_ios<char>       ios;        ///< @isiosfwd
    00133   typedef basic_streambuf<char>     streambuf;  ///< @isiosfwd
    00134   typedef basic_istream<char>       istream;    ///< @isiosfwd
    00135   typedef basic_ostream<char>       ostream;    ///< @isiosfwd
    00136   typedef basic_iostream<char>      iostream;   ///< @isiosfwd
    00137   typedef basic_stringbuf<char>     stringbuf;  ///< @isiosfwd
    00138   typedef basic_istringstream<char>     istringstream;  ///< @isiosfwd
    00139   typedef basic_ostringstream<char>     ostringstream;  ///< @isiosfwd
    00140   typedef basic_stringstream<char>  stringstream;   ///< @isiosfwd
    00141   typedef basic_filebuf<char>       filebuf;    ///< @isiosfwd
    00142   typedef basic_ifstream<char>      ifstream;   ///< @isiosfwd
    00143   typedef basic_ofstream<char>      ofstream;   ///< @isiosfwd
    00144   typedef basic_fstream<char>       fstream;    ///< @isiosfwd
    00145
    00146 #ifdef _GLIBCXX_USE_WCHAR_T
    00147   typedef basic_ios<wchar_t>        wios;       ///< @isiosfwd
    00148   typedef basic_streambuf<wchar_t>  wstreambuf; ///< @isiosfwd
    00149   typedef basic_istream<wchar_t>    wistream;   ///< @isiosfwd
    00150   typedef basic_ostream<wchar_t>    wostream;   ///< @isiosfwd
    00151   typedef basic_iostream<wchar_t>   wiostream;  ///< @isiosfwd
    00152   typedef basic_stringbuf<wchar_t>  wstringbuf; ///< @isiosfwd
    00153   typedef basic_istringstream<wchar_t>  wistringstream; ///< @isiosfwd
    00154   typedef basic_ostringstream<wchar_t>  wostringstream; ///< @isiosfwd
    00155   typedef basic_stringstream<wchar_t>   wstringstream;  ///< @isiosfwd
    00156   typedef basic_filebuf<wchar_t>    wfilebuf;   ///< @isiosfwd
    00157   typedef basic_ifstream<wchar_t>   wifstream;  ///< @isiosfwd
    00158   typedef basic_ofstream<wchar_t>   wofstream;  ///< @isiosfwd
    00159   typedef basic_fstream<wchar_t>    wfstream;   ///< @isiosfwd
    00160 #endif
    00161   /** @}  */
    00162
    00163 _GLIBCXX_END_NAMESPACE
    00164
    00165 #endif /* _GLIBCXX_IOSFWD */