| // Move, forward and identity for C++0x + swap -*- C++ -*- |
| |
| // Copyright (C) 2007 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 2, 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. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING. If not, write to the Free |
| // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| // USA. |
| |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file does not by itself cause the resulting executable to be covered by |
| // the GNU General Public License. This exception does not however |
| // invalidate any other reasons why the executable file might be covered by |
| // the GNU General Public License. |
| |
| /** @file stl_move.h |
| * This is an internal header file, included by other library headers. |
| * You should not attempt to use it directly. |
| */ |
| |
| #ifndef _STL_MOVE_H |
| #define _STL_MOVE_H 1 |
| |
| #include <bits/c++config.h> |
| #include <bits/concept_check.h> |
| |
| #ifdef __GXX_EXPERIMENTAL_CXX0X__ |
| #include <type_traits> |
| |
| _GLIBCXX_BEGIN_NAMESPACE(std) |
| |
| // 20.2.2, forward/move |
| template<typename _Tp> |
| struct identity |
| { |
| typedef _Tp type; |
| }; |
| |
| template<typename _Tp> |
| inline _Tp&& |
| forward(typename std::identity<_Tp>::type&& __t) |
| { return __t; } |
| |
| template<typename _Tp> |
| inline typename std::remove_reference<_Tp>::type&& |
| move(_Tp&& __t) |
| { return __t; } |
| |
| _GLIBCXX_END_NAMESPACE |
| |
| #define _GLIBCXX_MOVE(_Tp) std::move(_Tp) |
| #else |
| #define _GLIBCXX_MOVE(_Tp) (_Tp) |
| #endif |
| |
| _GLIBCXX_BEGIN_NAMESPACE(std) |
| |
| /** |
| * @brief Swaps two values. |
| * @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_END_NAMESPACE |
| |
| #endif /* _STL_MOVE_H */ |