tr1/utility

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00001 // TR1 utility -*- C++ -*-
00002 
00003 // Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /** @file tr1/utility
00031  *  This is a TR1 C++ Library header. 
00032  */
00033 
00034 #ifndef _TR1_UTILITY
00035 #define _TR1_UTILITY 1
00036 
00037 #include "../utility"
00038 
00039 namespace std
00040 {
00041 _GLIBCXX_BEGIN_NAMESPACE(tr1)
00042 
00043   template<class _Tp> class tuple_size;
00044   template<int _Int, class _Tp> class tuple_element;
00045 
00046    // Various functions which give std::pair a tuple-like interface.
00047   template<class _Tp1, class _Tp2>
00048     struct tuple_size<std::pair<_Tp1, _Tp2> >
00049     { static const int value = 2; };
00050 
00051   template<class _Tp1, class _Tp2>
00052     const int tuple_size<std::pair<_Tp1, _Tp2> >::value;
00053 
00054   template<class _Tp1, class _Tp2>
00055     struct tuple_element<0, std::pair<_Tp1, _Tp2> >
00056     { typedef _Tp1 type; };
00057  
00058   template<class _Tp1, class _Tp2>
00059     struct tuple_element<1, std::pair<_Tp1, _Tp2> >
00060     { typedef _Tp2 type; };
00061  
00062 
00063   template<int _Int> struct __pair_get;
00064 
00065   template<>
00066     struct __pair_get<0>
00067     {
00068       template<typename _Tp1, typename _Tp2>
00069       static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
00070       { return __pair.first; }
00071 
00072       template<typename _Tp1, typename _Tp2>
00073       static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00074       { return __pair.first; }
00075     };
00076 
00077   template<>
00078     struct __pair_get<1>
00079     {
00080       template<typename _Tp1, typename _Tp2>
00081       static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
00082       { return __pair.second; }
00083 
00084       template<typename _Tp1, typename _Tp2>
00085       static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00086       { return __pair.second; }
00087     };
00088 
00089    template<int _Int, class _Tp1, class _Tp2>
00090      inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00091      get(std::pair<_Tp1, _Tp2>& __in)
00092      { return __pair_get<_Int>::__get(__in); }
00093  
00094    template<int _Int, class _Tp1, class _Tp2>
00095      inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00096      get(const std::pair<_Tp1, _Tp2>& __in)
00097      { return __pair_get<_Int>::__const_get(__in); }
00098 
00099 _GLIBCXX_END_NAMESPACE
00100 } 
00101 
00102 #endif

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