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, 2009
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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
00019 // permissions described in the GCC Runtime Library Exception, version
00020 // 3.1, as published by the Free Software Foundation.
00021 
00022 // You should have received a copy of the GNU General Public License and
00023 // a copy of the GCC Runtime Library Exception along with this program;
00024 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00025 // <http://www.gnu.org/licenses/>.
00026 
00027 /** @file iosfwd
00028  *  This is a Standard C++ Library header.
00029  */
00030 
00031 //
00032 // ISO C++ 14882: 27.2  Forward declarations
00033 //
00034 
00035 #ifndef _GLIBCXX_IOSFWD
00036 #define _GLIBCXX_IOSFWD 1
00037 
00038 #pragma GCC system_header
00039 
00040 #include <bits/c++config.h>
00041 #include <bits/stringfwd.h>     // For string forward declarations.
00042 #include <bits/postypes.h>
00043 
00044 _GLIBCXX_BEGIN_NAMESPACE(std)
00045 
00046   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00047     class basic_ios;
00048 
00049   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00050     class basic_streambuf;
00051 
00052   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00053     class basic_istream;
00054 
00055   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00056     class basic_ostream;
00057 
00058   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00059     class basic_iostream;
00060 
00061   template<typename _CharT, typename _Traits = char_traits<_CharT>,
00062         typename _Alloc = allocator<_CharT> >
00063     class basic_stringbuf;
00064 
00065   template<typename _CharT, typename _Traits = char_traits<_CharT>,
00066        typename _Alloc = allocator<_CharT> >
00067     class basic_istringstream;
00068 
00069   template<typename _CharT, typename _Traits = char_traits<_CharT>,
00070        typename _Alloc = allocator<_CharT> >
00071     class basic_ostringstream;
00072 
00073   template<typename _CharT, typename _Traits = char_traits<_CharT>,
00074        typename _Alloc = allocator<_CharT> >
00075     class basic_stringstream;
00076 
00077   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00078     class basic_filebuf;
00079 
00080   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00081     class basic_ifstream;
00082 
00083   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00084     class basic_ofstream;
00085 
00086   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00087     class basic_fstream;
00088 
00089   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00090     class istreambuf_iterator;
00091 
00092   template<typename _CharT, typename _Traits = char_traits<_CharT> >
00093     class ostreambuf_iterator;
00094 
00095   // _GLIBCXX_RESOLVE_LIB_DEFECTS
00096   // Not included.   (??? Apparently no LWG number?)
00097   class ios_base; 
00098 
00099   /** 
00100    *  @defgroup io I/O
00101    *
00102    *  Nearly all of the I/O classes are parameterized on the type of
00103    *  characters they read and write.  (The major exception is ios_base at
00104    *  the top of the hierarchy.)  This is a change from pre-Standard
00105    *  streams, which were not templates.
00106    *
00107    *  For ease of use and compatibility, all of the basic_* I/O-related
00108    *  classes are given typedef names for both of the builtin character
00109    *  widths (wide and narrow).  The typedefs are the same as the
00110    *  pre-Standard names, for example:
00111    *
00112    *  @code
00113    *     typedef basic_ifstream<char>  ifstream;
00114    *  @endcode
00115    *
00116    *  Because properly forward-declaring these classes can be difficult, you
00117    *  should not do it yourself.  Instead, include the &lt;iosfwd&gt;
00118    *  header, which contains only declarations of all the I/O classes as
00119    *  well as the typedefs.  Trying to forward-declare the typedefs
00120    *  themselves (e.g., "class ostream;") is not valid ISO C++.
00121    *
00122    *  For more specific declarations, see
00123    *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch24.html
00124    *
00125    *  @{
00126   */
00127   typedef basic_ios<char>       ios;        ///< @isiosfwd
00128   typedef basic_streambuf<char>     streambuf;  ///< @isiosfwd
00129   typedef basic_istream<char>       istream;    ///< @isiosfwd
00130   typedef basic_ostream<char>       ostream;    ///< @isiosfwd
00131   typedef basic_iostream<char>      iostream;   ///< @isiosfwd
00132   typedef basic_stringbuf<char>     stringbuf;  ///< @isiosfwd
00133   typedef basic_istringstream<char>     istringstream;  ///< @isiosfwd
00134   typedef basic_ostringstream<char>     ostringstream;  ///< @isiosfwd
00135   typedef basic_stringstream<char>  stringstream;   ///< @isiosfwd
00136   typedef basic_filebuf<char>       filebuf;    ///< @isiosfwd
00137   typedef basic_ifstream<char>      ifstream;   ///< @isiosfwd
00138   typedef basic_ofstream<char>      ofstream;   ///< @isiosfwd
00139   typedef basic_fstream<char>       fstream;    ///< @isiosfwd
00140 
00141 #ifdef _GLIBCXX_USE_WCHAR_T
00142   typedef basic_ios<wchar_t>        wios;       ///< @isiosfwd
00143   typedef basic_streambuf<wchar_t>  wstreambuf; ///< @isiosfwd
00144   typedef basic_istream<wchar_t>    wistream;   ///< @isiosfwd
00145   typedef basic_ostream<wchar_t>    wostream;   ///< @isiosfwd
00146   typedef basic_iostream<wchar_t>   wiostream;  ///< @isiosfwd
00147   typedef basic_stringbuf<wchar_t>  wstringbuf; ///< @isiosfwd
00148   typedef basic_istringstream<wchar_t>  wistringstream; ///< @isiosfwd
00149   typedef basic_ostringstream<wchar_t>  wostringstream; ///< @isiosfwd
00150   typedef basic_stringstream<wchar_t>   wstringstream;  ///< @isiosfwd
00151   typedef basic_filebuf<wchar_t>    wfilebuf;   ///< @isiosfwd
00152   typedef basic_ifstream<wchar_t>   wifstream;  ///< @isiosfwd
00153   typedef basic_ofstream<wchar_t>   wofstream;  ///< @isiosfwd
00154   typedef basic_fstream<wchar_t>    wfstream;   ///< @isiosfwd
00155 #endif
00156   /** @}  */
00157 
00158 _GLIBCXX_END_NAMESPACE
00159 
00160 #endif /* _GLIBCXX_IOSFWD */

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