1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
// Move, forward and identity for C++0x + swap -*- C++ -*-
// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file move.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _MOVE_H
#define _MOVE_H 1
#include <bits/c++config.h>
#include <cstddef>
#include <bits/concept_check.h>
_GLIBCXX_BEGIN_NAMESPACE(std)
// Used, in C++03 mode too, by allocators, etc.
template<typename _Tp>
inline _Tp*
__addressof(_Tp& __r)
{
return reinterpret_cast<_Tp*>
(&const_cast<char&>(reinterpret_cast<const volatile char&>(__r)));
}
_GLIBCXX_END_NAMESPACE
#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <type_traits> // Brings in std::declval too.
_GLIBCXX_BEGIN_NAMESPACE(std)
/// identity
template<typename _Tp>
struct identity
{
typedef _Tp type;
};
/// forward (as per N2835)
/// Forward lvalues as rvalues.
template<typename _Tp>
inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
forward(typename std::identity<_Tp>::type& __t)
{ return static_cast<_Tp&&>(__t); }
/// Forward rvalues as rvalues.
template<typename _Tp>
inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
forward(typename std::identity<_Tp>::type&& __t)
{ return static_cast<_Tp&&>(__t); }
// Forward lvalues as lvalues.
template<typename _Tp>
inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
forward(typename std::identity<_Tp>::type __t)
{ return __t; }
// Prevent forwarding rvalues as const lvalues.
template<typename _Tp>
inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
forward(typename std::remove_reference<_Tp>::type&& __t) = delete;
/**
* @brief Move a value.
* @ingroup mutating_algorithms
* @param __t A thing of arbitrary type.
* @return Same, moved.
*/
template<typename _Tp>
inline typename std::remove_reference<_Tp>::type&&
move(_Tp&& __t)
{ return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
/// declval, defined in <type_traits>.
/**
* @brief Returns the actual address of the object or function
* referenced by r, even in the presence of an overloaded
* operator&.
* @param __r Reference to an object or function.
* @return The actual address.
*/
template<typename _Tp>
inline _Tp*
addressof(_Tp& __r)
{ return std::__addressof(__r); }
_GLIBCXX_END_NAMESPACE
#define _GLIBCXX_MOVE(_Tp) std::move(_Tp)
#define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val)
#else
#define _GLIBCXX_MOVE(_Tp) (_Tp)
#define _GLIBCXX_FORWARD(_Tp, __val) (__val)
#endif
_GLIBCXX_BEGIN_NAMESPACE(std)
/**
* @brief Swaps two values.
* @ingroup mutating_algorithms
* @param __a A thing of arbitrary type.
* @param __b Another thing of arbitrary type.
* @return Nothing.
*/
template<typename _Tp>
inline void
swap(_Tp& __a, _Tp& __b)
{
// concept requirements
__glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
_Tp __tmp = _GLIBCXX_MOVE(__a);
__a = _GLIBCXX_MOVE(__b);
__b = _GLIBCXX_MOVE(__tmp);
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 809. std::swap should be overloaded for array types.
template<typename _Tp, size_t _Nm>
inline void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
{
for (size_t __n = 0; __n < _Nm; ++__n)
swap(__a[__n], __b[__n]);
}
_GLIBCXX_END_NAMESPACE
#endif /* _MOVE_H */
|
