99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
// Move, forward and identity for C++0x + swap -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file move.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _MOVE_H
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#define _MOVE_H 1
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#include <bits/c++config.h>
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#include <cstddef>
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#include <bits/concept_check.h>
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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#include <type_traits>
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_GLIBCXX_BEGIN_NAMESPACE(std)
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// 20.2.2, forward/move
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template<typename _Tp>
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struct identity
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{
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typedef _Tp type;
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};
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template<typename _Tp>
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inline _Tp&&
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forward(typename std::identity<_Tp>::type&& __t)
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{ return __t; }
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template<typename _Tp>
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inline typename std::remove_reference<_Tp>::type&&
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move(_Tp&& __t)
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{ return __t; }
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_GLIBCXX_END_NAMESPACE
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#define _GLIBCXX_MOVE(_Tp) std::move(_Tp)
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#else
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#define _GLIBCXX_MOVE(_Tp) (_Tp)
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#endif
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_GLIBCXX_BEGIN_NAMESPACE(std)
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/**
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* @brief Swaps two values.
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* @param a A thing of arbitrary type.
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* @param b Another thing of arbitrary type.
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* @return Nothing.
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*/
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template<typename _Tp>
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inline void
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swap(_Tp& __a, _Tp& __b)
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{
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// concept requirements
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__glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
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_Tp __tmp = _GLIBCXX_MOVE(__a);
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__a = _GLIBCXX_MOVE(__b);
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__b = _GLIBCXX_MOVE(__tmp);
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 809. std::swap should be overloaded for array types.
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template<typename _Tp, size_t _Nm>
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inline void
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swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
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{
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for (size_t __n = 0; __n < _Nm; ++__n)
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swap(__a[__n], __b[__n]);
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}
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_GLIBCXX_END_NAMESPACE
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#endif /* _MOVE_H */
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