00001 /****************************************************************************** 00002 * Copyright (C) 2014 by Ralf Kaestner * 00003 * ralf.kaestner@gmail.com * 00004 * * 00005 * This program is free software; you can redistribute it and/or modify * 00006 * it under the terms of the Lesser GNU General Public License as published by* 00007 * the Free Software Foundation; either version 3 of the License, or * 00008 * (at your option) any later version. * 00009 * * 00010 * This program is distributed in the hope that it will be useful, * 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 00013 * Lesser GNU General Public License for more details. * 00014 * * 00015 * You should have received a copy of the Lesser GNU General Public License * 00016 * along with this program. If not, see <http://www.gnu.org/licenses/>. * 00017 ******************************************************************************/ 00018 00023 #ifndef VARIANT_TOPIC_TOOLS_MESSAGE_FIELD_TYPE_TRAITS_H 00024 #define VARIANT_TOPIC_TOOLS_MESSAGE_FIELD_TYPE_TRAITS_H 00025 00026 namespace variant_topic_tools { 00029 struct MessageFieldTypeTraits { 00030 template <typename U> struct HasIsValid { 00031 template <typename V, bool (V::*)() const> struct Test {}; 00032 00033 template <typename V> static char test(Test<V, &V::isValid>*); 00034 template <typename V> static int test(...); 00035 00036 static const bool value = sizeof(test<U>(0)) == sizeof(char); 00037 }; 00038 }; 00039 }; 00040 00041 #endif