1 // Move, forward and identity for C++0x + swap -*- C++ -*-
3 // Copyright (C) 2007, 2008, 2009 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 an internal header file, included by other library headers.
27 * You should not attempt to use it directly.
33 #include <bits/c++config.h>
35 #include <bits/concept_check.h>
37 #ifdef __GXX_EXPERIMENTAL_CXX0X__
38 #include <type_traits>
40 _GLIBCXX_BEGIN_NAMESPACE(std)
43 template<typename _Tp>
50 template<typename _Tp>
52 forward(typename std::identity<_Tp>::type&& __t)
56 * @brief Move a value.
57 * @ingroup mutating_algorithms
58 * @param __t A thing of arbitrary type.
59 * @return Same, moved.
61 template<typename _Tp>
62 inline typename std::remove_reference<_Tp>::type&&
66 _GLIBCXX_END_NAMESPACE
68 #define _GLIBCXX_MOVE(_Tp) std::move(_Tp)
70 #define _GLIBCXX_MOVE(_Tp) (_Tp)
73 _GLIBCXX_BEGIN_NAMESPACE(std)
76 * @brief Swaps two values.
77 * @ingroup mutating_algorithms
78 * @param __a A thing of arbitrary type.
79 * @param __b Another thing of arbitrary type.
82 template<typename _Tp>
84 swap(_Tp& __a, _Tp& __b)
86 // concept requirements
87 __glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
89 _Tp __tmp = _GLIBCXX_MOVE(__a);
90 __a = _GLIBCXX_MOVE(__b);
91 __b = _GLIBCXX_MOVE(__tmp);
94 // _GLIBCXX_RESOLVE_LIB_DEFECTS
95 // DR 809. std::swap should be overloaded for array types.
96 template<typename _Tp, size_t _Nm>
98 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
100 for (size_t __n = 0; __n < _Nm; ++__n)
101 swap(__a[__n], __b[__n]);
104 _GLIBCXX_END_NAMESPACE