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1 | // TR1 utility -*- C++ -*- |
2 | ||
8d9254fc | 3 | // Copyright (C) 2004-2020 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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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 | ||
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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/>. | |
909a9d44 | 24 | |
143c27b0 | 25 | /** @file tr1/utility |
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26 | * This is a TR1 C++ Library header. |
27 | */ | |
28 | ||
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29 | #ifndef _GLIBCXX_TR1_UTILITY |
30 | #define _GLIBCXX_TR1_UTILITY 1 | |
f2ede5d6 | 31 | |
e133ace8 | 32 | #pragma GCC system_header |
f2ede5d6 | 33 | |
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34 | #include <bits/c++config.h> |
35 | #include <bits/stl_relops.h> | |
36 | #include <bits/stl_pair.h> | |
37 | ||
12ffa228 | 38 | namespace std _GLIBCXX_VISIBILITY(default) |
53dc5044 | 39 | { |
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40 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
41 | ||
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42 | namespace tr1 |
43 | { | |
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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); } | |
4a15d842 | 103 | } |
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104 | |
105 | _GLIBCXX_END_NAMESPACE_VERSION | |
53dc5044 | 106 | } |
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107 | |
108 | #endif // _GLIBCXX_TR1_UTILITY |