tr1_impl/utility

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00001 
00002 // TR1 utility -*- C++ -*-
00003 
00004 // Copyright (C) 2007 Free Software Foundation, Inc.
00005 //
00006 // This file is part of the GNU ISO C++ Library.  This library is free
00007 // software; you can redistribute it and/or modify it under the
00008 // terms of the GNU General Public License as published by the
00009 // Free Software Foundation; either version 2, or (at your option)
00010 // any later version.
00011 
00012 // This library is distributed in the hope that it will be useful,
00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015 // GNU General Public License for more details.
00016 
00017 // You should have received a copy of the GNU General Public License along
00018 // with this library; see the file COPYING.  If not, write to the Free
00019 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00020 // USA.
00021 
00022 // As a special exception, you may use this file as part of a free software
00023 // library without restriction.  Specifically, if other files instantiate
00024 // templates or use macros or inline functions from this file, or you compile
00025 // this file and link it with other files to produce an executable, this
00026 // file does not by itself cause the resulting executable to be covered by
00027 // the GNU General Public License.  This exception does not however
00028 // invalidate any other reasons why the executable file might be covered by
00029 // the GNU General Public License.
00030 
00031 /** @file tr1_impl/utility
00032  *  This is an internal header file, included by other library headers.
00033  *  You should not attempt to use it directly.
00034  */
00035 
00036 namespace std
00037 {
00038 _GLIBCXX_BEGIN_NAMESPACE_TR1
00039 
00040   template<class _Tp> class tuple_size;
00041   template<int _Int, class _Tp> class tuple_element;
00042 
00043    // Various functions which give std::pair a tuple-like interface.
00044   template<class _Tp1, class _Tp2>
00045     struct tuple_size<std::pair<_Tp1, _Tp2> >
00046     { static const int value = 2; };
00047 
00048   template<class _Tp1, class _Tp2>
00049     const int tuple_size<std::pair<_Tp1, _Tp2> >::value;
00050 
00051   template<class _Tp1, class _Tp2>
00052     struct tuple_element<0, std::pair<_Tp1, _Tp2> >
00053     { typedef _Tp1 type; };
00054  
00055   template<class _Tp1, class _Tp2>
00056     struct tuple_element<1, std::pair<_Tp1, _Tp2> >
00057     { typedef _Tp2 type; };
00058  
00059 
00060   template<int _Int> struct __pair_get;
00061 
00062   template<>
00063     struct __pair_get<0>
00064     {
00065       template<typename _Tp1, typename _Tp2>
00066       static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
00067       { return __pair.first; }
00068 
00069       template<typename _Tp1, typename _Tp2>
00070       static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00071       { return __pair.first; }
00072     };
00073 
00074   template<>
00075     struct __pair_get<1>
00076     {
00077       template<typename _Tp1, typename _Tp2>
00078       static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
00079       { return __pair.second; }
00080 
00081       template<typename _Tp1, typename _Tp2>
00082       static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00083       { return __pair.second; }
00084     };
00085 
00086    template<int _Int, class _Tp1, class _Tp2>
00087      inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00088      get(std::pair<_Tp1, _Tp2>& __in)
00089      { return __pair_get<_Int>::__get(__in); }
00090  
00091    template<int _Int, class _Tp1, class _Tp2>
00092      inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00093      get(const std::pair<_Tp1, _Tp2>& __in)
00094      { return __pair_get<_Int>::__const_get(__in); }
00095 
00096 _GLIBCXX_END_NAMESPACE_TR1
00097 }
00098 

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