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e14e932b | 1 | // Move, forward and identity for C++0x + swap -*- C++ -*- |
1476e59c | 2 | |
882b3d5c | 3 | // Copyright (C) 2007, 2008, 2009, 2010 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 | |
f910786b | 25 | /** @file bits/move.h |
1476e59c | 26 | * This is an internal header file, included by other library headers. |
f910786b | 27 | * Do not attempt to use it directly. @headername{utility} |
1476e59c PC |
28 | */ |
29 | ||
caa8b3c6 PC |
30 | #ifndef _MOVE_H |
31 | #define _MOVE_H 1 | |
1476e59c | 32 | |
e14e932b PC |
33 | #include <bits/c++config.h> |
34 | #include <bits/concept_check.h> | |
35 | ||
882b3d5c PC |
36 | _GLIBCXX_BEGIN_NAMESPACE(std) |
37 | ||
38 | // Used, in C++03 mode too, by allocators, etc. | |
39 | template<typename _Tp> | |
40 | inline _Tp* | |
41 | __addressof(_Tp& __r) | |
42 | { | |
43 | return reinterpret_cast<_Tp*> | |
44 | (&const_cast<char&>(reinterpret_cast<const volatile char&>(__r))); | |
45 | } | |
46 | ||
47 | _GLIBCXX_END_NAMESPACE | |
48 | ||
1476e59c | 49 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ |
7274deff | 50 | #include <type_traits> // Brings in std::declval too. |
1476e59c PC |
51 | |
52 | _GLIBCXX_BEGIN_NAMESPACE(std) | |
5f1fd346 | 53 | |
ad269884 | 54 | /// forward (as per N3143) |
4c7aaebf | 55 | template<typename _Tp> |
ad269884 PC |
56 | inline _Tp&& |
57 | forward(typename std::remove_reference<_Tp>::type& __t) | |
4c7aaebf PC |
58 | { return static_cast<_Tp&&>(__t); } |
59 | ||
4c7aaebf | 60 | template<typename _Tp> |
ad269884 PC |
61 | inline _Tp&& |
62 | forward(typename std::remove_reference<_Tp>::type&& __t) | |
63 | { | |
64 | static_assert(!std::is_lvalue_reference<_Tp>::value, "template argument" | |
65 | " substituting _Tp is an lvalue reference type"); | |
66 | return static_cast<_Tp&&>(__t); | |
67 | } | |
e7f1930f | 68 | |
fd9380a6 BK |
69 | /** |
70 | * @brief Move a value. | |
71 | * @ingroup mutating_algorithms | |
72 | * @param __t A thing of arbitrary type. | |
73 | * @return Same, moved. | |
74 | */ | |
1476e59c PC |
75 | template<typename _Tp> |
76 | inline typename std::remove_reference<_Tp>::type&& | |
77 | move(_Tp&& __t) | |
e7f1930f | 78 | { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); } |
1476e59c | 79 | |
5ab3a5af | 80 | /// declval, from type_traits. |
7274deff | 81 | |
882b3d5c PC |
82 | /** |
83 | * @brief Returns the actual address of the object or function | |
84 | * referenced by r, even in the presence of an overloaded | |
85 | * operator&. | |
86 | * @param __r Reference to an object or function. | |
87 | * @return The actual address. | |
88 | */ | |
89 | template<typename _Tp> | |
90 | inline _Tp* | |
91 | addressof(_Tp& __r) | |
92 | { return std::__addressof(__r); } | |
93 | ||
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94 | _GLIBCXX_END_NAMESPACE |
95 | ||
5f1fd346 | 96 | #define _GLIBCXX_MOVE(__val) std::move(__val) |
55dd8445 | 97 | #define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val) |
d98f312c | 98 | #else |
5f1fd346 | 99 | #define _GLIBCXX_MOVE(__val) (__val) |
55dd8445 | 100 | #define _GLIBCXX_FORWARD(_Tp, __val) (__val) |
1476e59c PC |
101 | #endif |
102 | ||
e14e932b PC |
103 | _GLIBCXX_BEGIN_NAMESPACE(std) |
104 | ||
105 | /** | |
106 | * @brief Swaps two values. | |
fd9380a6 BK |
107 | * @ingroup mutating_algorithms |
108 | * @param __a A thing of arbitrary type. | |
109 | * @param __b Another thing of arbitrary type. | |
e14e932b PC |
110 | * @return Nothing. |
111 | */ | |
112 | template<typename _Tp> | |
113 | inline void | |
114 | swap(_Tp& __a, _Tp& __b) | |
115 | { | |
116 | // concept requirements | |
117 | __glibcxx_function_requires(_SGIAssignableConcept<_Tp>) | |
118 | ||
119 | _Tp __tmp = _GLIBCXX_MOVE(__a); | |
120 | __a = _GLIBCXX_MOVE(__b); | |
121 | __b = _GLIBCXX_MOVE(__tmp); | |
122 | } | |
123 | ||
caa8b3c6 PC |
124 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
125 | // DR 809. std::swap should be overloaded for array types. | |
126 | template<typename _Tp, size_t _Nm> | |
127 | inline void | |
128 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) | |
129 | { | |
130 | for (size_t __n = 0; __n < _Nm; ++__n) | |
131 | swap(__a[__n], __b[__n]); | |
132 | } | |
133 | ||
e14e932b PC |
134 | _GLIBCXX_END_NAMESPACE |
135 | ||
caa8b3c6 | 136 | #endif /* _MOVE_H */ |