libstdc++-v3/include/tr1/utility

   1 // TR1 utility -*- C++ -*-
   2
   3 // Copyright (C) 2004, 2005, 2006, 2007, 2008. 2009, 2010, 2011
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 /** @file tr1/utility
  27  *  This is a TR1 C++ Library header.
  28  */
  29
  30 #ifndef _GLIBCXX_TR1_UTILITY
  31 #define _GLIBCXX_TR1_UTILITY 1
  32
  33 #pragma GCC system_header
  34
  35 #include <bits/c++config.h>
  36 #include <bits/stl_relops.h>
  37 #include <bits/stl_pair.h>
  38
  39 namespace std _GLIBCXX_VISIBILITY(default)
  40 {
  41 namespace tr1
  42 {
  43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  44
  45   template<class _Tp>
  46     class tuple_size;
  47
  48   template<int _Int, class _Tp>
  49     class tuple_element;
  50
  51    // Various functions which give std::pair a tuple-like interface.
  52   template<class _Tp1, class _Tp2>
  53     struct tuple_size<std::pair<_Tp1, _Tp2> >
  54     { static const int value = 2; };
  55
  56   template<class _Tp1, class _Tp2>
  57     const int
  58     tuple_size<std::pair<_Tp1, _Tp2> >::value;
  59
  60   template<class _Tp1, class _Tp2>
  61     struct tuple_element<0, std::pair<_Tp1, _Tp2> >
  62     { typedef _Tp1 type; };
  63
  64   template<class _Tp1, class _Tp2>
  65     struct tuple_element<1, std::pair<_Tp1, _Tp2> >
  66     { typedef _Tp2 type; };
  67
  68   template<int _Int>
  69     struct __pair_get;
  70
  71   template<>
  72     struct __pair_get<0>
  73     {
  74       template<typename _Tp1, typename _Tp2>
  75       static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
  76       { return __pair.first; }
  77
  78       template<typename _Tp1, typename _Tp2>
  79       static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
  80       { return __pair.first; }
  81     };
  82
  83   template<>
  84     struct __pair_get<1>
  85     {
  86       template<typename _Tp1, typename _Tp2>
  87       static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
  88       { return __pair.second; }
  89
  90       template<typename _Tp1, typename _Tp2>
  91       static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
  92       { return __pair.second; }
  93     };
  94
  95   template<int _Int, class _Tp1, class _Tp2>
  96     inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
  97     get(std::pair<_Tp1, _Tp2>& __in)
  98     { return __pair_get<_Int>::__get(__in); }
  99
 100   template<int _Int, class _Tp1, class _Tp2>
 101     inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
 102     get(const std::pair<_Tp1, _Tp2>& __in)
 103     { return __pair_get<_Int>::__const_get(__in); }
 104
 105 _GLIBCXX_END_NAMESPACE_VERSION
 106 }
 107 }
 108
 109 #endif // _GLIBCXX_TR1_UTILITY