1// TR1 utility -*- C++ -*-
2
3// Copyright (C) 2004-2015 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/utility
26 *  This is a TR1 C++ Library header.
27 */
28
29#ifndef _GLIBCXX_TR1_UTILITY
30#define _GLIBCXX_TR1_UTILITY 1
31
32#pragma GCC system_header
33
34#include <bits/c++config.h>
35#include <bits/stl_relops.h>
36#include <bits/stl_pair.h>
37
38namespace std _GLIBCXX_VISIBILITY(default)
39{
40namespace tr1
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44  template<class _Tp>
45    class tuple_size;
46
47  template<int _Int, class _Tp>
48    class tuple_element;
49
50   // Various functions which give std::pair a tuple-like interface.
51  template<class _Tp1, class _Tp2>
52    struct tuple_size<std::pair<_Tp1, _Tp2> >
53    { static const int value = 2; };
54
55  template<class _Tp1, class _Tp2>
56    const int
57    tuple_size<std::pair<_Tp1, _Tp2> >::value;
58
59  template<class _Tp1, class _Tp2>
60    struct tuple_element<0, std::pair<_Tp1, _Tp2> >
61    { typedef _Tp1 type; };
62
63  template<class _Tp1, class _Tp2>
64    struct tuple_element<1, std::pair<_Tp1, _Tp2> >
65    { typedef _Tp2 type; };
66
67  template<int _Int>
68    struct __pair_get;
69
70  template<>
71    struct __pair_get<0>
72    {
73      template<typename _Tp1, typename _Tp2>
74      static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
75      { return __pair.first; }
76
77      template<typename _Tp1, typename _Tp2>
78      static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
79      { return __pair.first; }
80    };
81
82  template<>
83    struct __pair_get<1>
84    {
85      template<typename _Tp1, typename _Tp2>
86      static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
87      { return __pair.second; }
88
89      template<typename _Tp1, typename _Tp2>
90      static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
91      { return __pair.second; }
92    };
93
94  template<int _Int, class _Tp1, class _Tp2>
95    inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
96    get(std::pair<_Tp1, _Tp2>& __in)
97    { return __pair_get<_Int>::__get(__in); }
98
99  template<int _Int, class _Tp1, class _Tp2>
100    inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
101    get(const std::pair<_Tp1, _Tp2>& __in)
102    { return __pair_get<_Int>::__const_get(__in); }
103
104_GLIBCXX_END_NAMESPACE_VERSION
105}
106}
107
108#endif // _GLIBCXX_TR1_UTILITY
109