is_compare_tag.h
Go to the documentation of this file.00001 /******************************************************************************* 00002 * 00003 * Copyright (c) 2008-2010 Michael Schulze <mschulze@ivs.cs.uni-magdeburg.de> 00004 * All rights reserved. 00005 * 00006 * Redistribution and use in source and binary forms, with or without 00007 * modification, are permitted provided that the following conditions 00008 * are met: 00009 * 00010 * * Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 00013 * * Redistributions in binary form must reproduce the above copyright 00014 * notice, this list of conditions and the following disclaimer in 00015 * the documentation and/or other materials provided with the 00016 * distribution. 00017 * 00018 * * Neither the name of the copyright holders nor the names of 00019 * contributors may be used to endorse or promote products derived 00020 * from this software without specific prior written permission. 00021 * 00022 * 00023 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 00024 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 00025 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00026 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00027 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00028 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00029 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00030 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00031 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00032 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00033 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00034 * 00035 * 00036 * $Id$ 00037 * 00038 ******************************************************************************/ 00039 00040 #ifndef __IsCompareTag_h__ 00041 #define __IsCompareTag_h__ 00042 00043 #include <boost/type_traits/is_same.hpp> 00044 #include "config/type_traits/contains_type.h" 00045 00046 namespace famouso { 00047 namespace mw { 00048 namespace attributes { 00049 namespace type_traits { 00050 00063 template <typename A, typename B> 00064 struct is_compare_tag { 00065 00066 CONTAINS_TYPE_(compare_tag); 00067 00068 template <bool, typename T, typename U> 00069 struct is_compare_tag_impl : 00070 boost::is_same< typename T::compare_tag, U > {}; 00071 00072 template <typename T, typename U> 00073 struct is_compare_tag_impl<false,T,U> { 00074 enum{ 00075 value = 0 00076 }; 00077 }; 00078 00079 typedef is_compare_tag type; 00080 00081 enum { 00082 value = is_compare_tag_impl< 00083 contains_type_compare_tag< A >::value, 00084 A, 00085 B 00086 >::value 00087 }; 00088 }; 00089 00090 } /* type_traits */ 00091 } /* attributes */ 00092 } /* mw */ 00093 } /* famouso */ 00094 00095 #endif 00096