volatile_trait.h

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00001 #ifndef _SIGX_VOLATILE_TRAIT_H_
00002 #define _SIGX_VOLATILE_TRAIT_H_
00003 
00004 /*
00005  * Copyright 2006 Klaus Triendl
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Library General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2 of the License, or (at your option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00015  * Library General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Library General Public
00018  * License along with this library; if not, write to the Free 
00019  * Software Foundation, 51 Franklin Street, Fifth Floor, 
00020  * Boston, MA 02110-1301, USA.
00021 */
00022 
00023 /*
00024  * Inspired by Andrei Alexandrescu's article "volatile - Multithreaded 
00025  * Programmer's Best Friend":
00026  * http://www.ddj.com/dept/cpp/184403766
00027 */
00028 
00029 
00030 namespace sigx
00031 {
00032 
00039 template<typename T_type>
00040 struct volatile_trait
00041 {
00042     typedef volatile T_type add;
00043     typedef T_type remove;
00044 };
00045 
00048 template<typename T_type>
00049 struct volatile_trait<volatile T_type>
00050 {
00051     typedef volatile T_type add;
00052     typedef T_type remove;
00053 };
00054 
00095 template<typename T_type>
00096 struct volatile_trait<T_type&>
00097 {
00098     typedef volatile T_type& add;
00099     typedef T_type& remove;
00100 };
00101 
00104 template<typename T_type>
00105 struct volatile_trait<volatile T_type&>
00106 {
00107     typedef volatile T_type& add;
00108     typedef T_type& remove;
00109 };
00110 
00111 
00112 
00113 template<typename T, typename T_src>
00114 T volatile_cast(T_src& tsrc)
00115 {
00116     return const_cast<T>(tsrc);
00117 }
00118 
00119 
00120 
00121 // @addtogroup threadsafety
00125 } // namespace sigx
00126 
00127 
00128 #endif // end file guard

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