1 // TR1 utility -*- C++ -*-
3 // Copyright (C) 2004-2023 Free Software Foundation, Inc.
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)
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.
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.
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/>.
26 * This is a TR1 C++ Library header.
29 #ifndef _GLIBCXX_TR1_UTILITY
30 #define _GLIBCXX_TR1_UTILITY 1
32 #pragma GCC system_header
34 #include <bits/requires_hosted.h> // TR1
36 #include <bits/c++config.h>
37 #include <bits/stl_relops.h>
38 #include <bits/stl_pair.h>
40 namespace std _GLIBCXX_VISIBILITY(default)
42 _GLIBCXX_BEGIN_NAMESPACE_VERSION
49 template<int _Int, class _Tp>
52 // Various functions which give std::pair a tuple-like interface.
53 template<class _Tp1, class _Tp2>
54 struct tuple_size<std::pair<_Tp1, _Tp2> >
55 { static const int value = 2; };
57 template<class _Tp1, class _Tp2>
59 tuple_size<std::pair<_Tp1, _Tp2> >::value;
61 template<class _Tp1, class _Tp2>
62 struct tuple_element<0, std::pair<_Tp1, _Tp2> >
63 { typedef _Tp1 type; };
65 template<class _Tp1, class _Tp2>
66 struct tuple_element<1, std::pair<_Tp1, _Tp2> >
67 { typedef _Tp2 type; };
75 template<typename _Tp1, typename _Tp2>
76 static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
77 { return __pair.first; }
79 template<typename _Tp1, typename _Tp2>
80 static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
81 { return __pair.first; }
87 template<typename _Tp1, typename _Tp2>
88 static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
89 { return __pair.second; }
91 template<typename _Tp1, typename _Tp2>
92 static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
93 { return __pair.second; }
96 template<int _Int, class _Tp1, class _Tp2>
97 inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
98 get(std::pair<_Tp1, _Tp2>& __in)
99 { return __pair_get<_Int>::__get(__in); }
101 template<int _Int, class _Tp1, class _Tp2>
102 inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
103 get(const std::pair<_Tp1, _Tp2>& __in)
104 { return __pair_get<_Int>::__const_get(__in); }
107 _GLIBCXX_END_NAMESPACE_VERSION
110 #endif // _GLIBCXX_TR1_UTILITY