tr1_impl/utility

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00001 // TR1 utility -*- C++ -*-
00002 
00003 // Copyright (C) 2007, 2008, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file tr1_impl/utility
00026  *  This is an internal header file, included by other library headers.
00027  *  You should not attempt to use it directly.
00028  */
00029 
00030 namespace std
00031 {
00032 _GLIBCXX_BEGIN_NAMESPACE_TR1
00033 
00034   template<class _Tp>
00035     class tuple_size;
00036 
00037 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00038   template<std::size_t _Int, class _Tp>
00039 #else
00040   template<int _Int, class _Tp>
00041 #endif
00042     class tuple_element;
00043 
00044    // Various functions which give std::pair a tuple-like interface.
00045   template<class _Tp1, class _Tp2>
00046     struct tuple_size<std::pair<_Tp1, _Tp2> >
00047 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00048     { static const std::size_t value = 2; };
00049 #else
00050     { static const int value = 2; };
00051 #endif
00052 
00053   template<class _Tp1, class _Tp2>
00054 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00055     const std::size_t
00056 #else
00057     const int
00058 #endif
00059     tuple_size<std::pair<_Tp1, _Tp2> >::value;
00060 
00061   template<class _Tp1, class _Tp2>
00062     struct tuple_element<0, std::pair<_Tp1, _Tp2> >
00063     { typedef _Tp1 type; };
00064  
00065   template<class _Tp1, class _Tp2>
00066     struct tuple_element<1, std::pair<_Tp1, _Tp2> >
00067     { typedef _Tp2 type; };
00068 
00069 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00070   template<std::size_t _Int>
00071 #else
00072   template<int _Int>
00073 #endif
00074     struct __pair_get;
00075 
00076   template<>
00077     struct __pair_get<0>
00078     {
00079       template<typename _Tp1, typename _Tp2>
00080       static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
00081       { return __pair.first; }
00082 
00083       template<typename _Tp1, typename _Tp2>
00084       static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00085       { return __pair.first; }
00086     };
00087 
00088   template<>
00089     struct __pair_get<1>
00090     {
00091       template<typename _Tp1, typename _Tp2>
00092       static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
00093       { return __pair.second; }
00094 
00095       template<typename _Tp1, typename _Tp2>
00096       static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
00097       { return __pair.second; }
00098     };
00099 
00100 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00101   template<std::size_t _Int, class _Tp1, class _Tp2>
00102 #else
00103   template<int _Int, class _Tp1, class _Tp2>
00104 #endif
00105     inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00106     get(std::pair<_Tp1, _Tp2>& __in)
00107     { return __pair_get<_Int>::__get(__in); }
00108 
00109 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
00110   template<std::size_t _Int, class _Tp1, class _Tp2>
00111 #else
00112   template<int _Int, class _Tp1, class _Tp2>
00113 #endif
00114     inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
00115     get(const std::pair<_Tp1, _Tp2>& __in)
00116     { return __pair_get<_Int>::__const_get(__in); }
00117 
00118 _GLIBCXX_END_NAMESPACE_TR1
00119 }
00120 

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