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
39namespace std _GLIBCXX_VISIBILITY(default)
40{
41namespace 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
110