1// TR1 utility -*- C++ -*-
2
3// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file tr1_impl/utility
26 *  This is an internal header file, included by other library headers.
27 *  You should not attempt to use it directly.
28 */
29
30namespace std
31{
32_GLIBCXX_BEGIN_NAMESPACE_TR1
33
34  template<class _Tp>
35    class tuple_size;
36
37#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
38  template<std::size_t _Int, class _Tp>
39#else
40  template<int _Int, class _Tp>
41#endif
42    class tuple_element;
43
44   // Various functions which give std::pair a tuple-like interface.
45  template<class _Tp1, class _Tp2>
46    struct tuple_size<std::pair<_Tp1, _Tp2> >
47#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
48    { static const std::size_t value = 2; };
49#else
50    { static const int value = 2; };
51#endif
52
53  template<class _Tp1, class _Tp2>
54#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
55    const std::size_t
56#else
57    const int
58#endif
59    tuple_size<std::pair<_Tp1, _Tp2> >::value;
60
61  template<class _Tp1, class _Tp2>
62    struct tuple_element<0, std::pair<_Tp1, _Tp2> >
63    { typedef _Tp1 type; };
64 
65  template<class _Tp1, class _Tp2>
66    struct tuple_element<1, std::pair<_Tp1, _Tp2> >
67    { typedef _Tp2 type; };
68
69#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
70  template<std::size_t _Int>
71#else
72  template<int _Int>
73#endif
74    struct __pair_get;
75
76  template<>
77    struct __pair_get<0>
78    {
79      template<typename _Tp1, typename _Tp2>
80      static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
81      { return __pair.first; }
82
83      template<typename _Tp1, typename _Tp2>
84      static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
85      { return __pair.first; }
86    };
87
88  template<>
89    struct __pair_get<1>
90    {
91      template<typename _Tp1, typename _Tp2>
92      static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
93      { return __pair.second; }
94
95      template<typename _Tp1, typename _Tp2>
96      static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
97      { return __pair.second; }
98    };
99
100#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
101  template<std::size_t _Int, class _Tp1, class _Tp2>
102#else
103  template<int _Int, class _Tp1, class _Tp2>
104#endif
105    inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
106    get(std::pair<_Tp1, _Tp2>& __in)
107    { return __pair_get<_Int>::__get(__in); }
108
109#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
110  template<std::size_t _Int, class _Tp1, class _Tp2>
111#else
112  template<int _Int, class _Tp1, class _Tp2>
113#endif
114    inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
115    get(const std::pair<_Tp1, _Tp2>& __in)
116    { return __pair_get<_Int>::__const_get(__in); }
117
118_GLIBCXX_END_NAMESPACE_TR1
119}
120
121