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e14e932b | 1 | // Move, forward and identity for C++0x + swap -*- C++ -*- |
1476e59c | 2 | |
748086b7 | 3 | // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc. |
1476e59c PC |
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) |
1476e59c PC |
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 | ||
748086b7 JJ |
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/>. | |
1476e59c | 24 | |
caa8b3c6 | 25 | /** @file move.h |
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26 | * This is an internal header file, included by other library headers. |
27 | * You should not attempt to use it directly. | |
28 | */ | |
29 | ||
caa8b3c6 PC |
30 | #ifndef _MOVE_H |
31 | #define _MOVE_H 1 | |
1476e59c | 32 | |
e14e932b | 33 | #include <bits/c++config.h> |
caa8b3c6 | 34 | #include <cstddef> |
e14e932b PC |
35 | #include <bits/concept_check.h> |
36 | ||
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37 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ |
38 | #include <type_traits> | |
39 | ||
40 | _GLIBCXX_BEGIN_NAMESPACE(std) | |
41 | ||
fd9380a6 | 42 | /// identity |
1476e59c PC |
43 | template<typename _Tp> |
44 | struct identity | |
45 | { | |
46 | typedef _Tp type; | |
47 | }; | |
48 | ||
fd9380a6 | 49 | /// forward |
1476e59c PC |
50 | template<typename _Tp> |
51 | inline _Tp&& | |
52 | forward(typename std::identity<_Tp>::type&& __t) | |
53 | { return __t; } | |
54 | ||
fd9380a6 BK |
55 | /** |
56 | * @brief Move a value. | |
57 | * @ingroup mutating_algorithms | |
58 | * @param __t A thing of arbitrary type. | |
59 | * @return Same, moved. | |
60 | */ | |
1476e59c PC |
61 | template<typename _Tp> |
62 | inline typename std::remove_reference<_Tp>::type&& | |
63 | move(_Tp&& __t) | |
64 | { return __t; } | |
65 | ||
66 | _GLIBCXX_END_NAMESPACE | |
67 | ||
d98f312c PC |
68 | #define _GLIBCXX_MOVE(_Tp) std::move(_Tp) |
69 | #else | |
85799c60 | 70 | #define _GLIBCXX_MOVE(_Tp) (_Tp) |
1476e59c PC |
71 | #endif |
72 | ||
e14e932b PC |
73 | _GLIBCXX_BEGIN_NAMESPACE(std) |
74 | ||
75 | /** | |
76 | * @brief Swaps two values. | |
fd9380a6 BK |
77 | * @ingroup mutating_algorithms |
78 | * @param __a A thing of arbitrary type. | |
79 | * @param __b Another thing of arbitrary type. | |
e14e932b PC |
80 | * @return Nothing. |
81 | */ | |
82 | template<typename _Tp> | |
83 | inline void | |
84 | swap(_Tp& __a, _Tp& __b) | |
85 | { | |
86 | // concept requirements | |
87 | __glibcxx_function_requires(_SGIAssignableConcept<_Tp>) | |
88 | ||
89 | _Tp __tmp = _GLIBCXX_MOVE(__a); | |
90 | __a = _GLIBCXX_MOVE(__b); | |
91 | __b = _GLIBCXX_MOVE(__tmp); | |
92 | } | |
93 | ||
caa8b3c6 PC |
94 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
95 | // DR 809. std::swap should be overloaded for array types. | |
96 | template<typename _Tp, size_t _Nm> | |
97 | inline void | |
98 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) | |
99 | { | |
100 | for (size_t __n = 0; __n < _Nm; ++__n) | |
101 | swap(__a[__n], __b[__n]); | |
102 | } | |
103 | ||
e14e932b PC |
104 | _GLIBCXX_END_NAMESPACE |
105 | ||
caa8b3c6 | 106 | #endif /* _MOVE_H */ |