# tr1_impl/utility

Go to the documentation of this file.

    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