00001 /* ///////////////////////////////////////////////////////////////////////// 00002 * File: stlsoft/meta/select_first_type_if.hpp (originally MTBase.h, ::SynesisStl) 00003 * 00004 * Purpose: Compile-time if component. 00005 * 00006 * Created: 19th November 1998 00007 * Updated: 10th August 2009 00008 * 00009 * Home: http://stlsoft.org/ 00010 * 00011 * Copyright (c) 1998-2009, Matthew Wilson and Synesis Software 00012 * All rights reserved. 00013 * 00014 * Redistribution and use in source and binary forms, with or without 00015 * modification, are permitted provided that the following conditions are met: 00016 * 00017 * - Redistributions of source code must retain the above copyright notice, this 00018 * list of conditions and the following disclaimer. 00019 * - Redistributions in binary form must reproduce the above copyright notice, 00020 * this list of conditions and the following disclaimer in the documentation 00021 * and/or other materials provided with the distribution. 00022 * - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of 00023 * any contributors may be used to endorse or promote products derived from 00024 * this software without specific prior written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00027 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00028 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00029 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00030 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00031 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00032 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00033 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00034 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00035 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00036 * POSSIBILITY OF SUCH DAMAGE. 00037 * 00038 * ////////////////////////////////////////////////////////////////////// */ 00039 00040 00048 #ifndef STLSOFT_INCL_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF 00049 #define STLSOFT_INCL_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF 00050 00051 #ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION 00052 # define STLSOFT_VER_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF_MAJOR 3 00053 # define STLSOFT_VER_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF_MINOR 18 00054 # define STLSOFT_VER_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF_REVISION 2 00055 # define STLSOFT_VER_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF_EDIT 122 00056 #endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */ 00057 00058 /* ///////////////////////////////////////////////////////////////////////// 00059 * Compatibility 00060 */ 00061 00062 /* 00063 [Incompatibilies-start] 00064 STLSOFT_COMPILER_IS_MSVC: _MSC_VER<1200 00065 STLSOFT_COMPILER_IS_WATCOM: 00066 [Incompatibilies-end] 00067 */ 00068 00069 /* ///////////////////////////////////////////////////////////////////////// 00070 * Includes 00071 */ 00072 00073 #ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT 00074 # include <stlsoft/stlsoft.h> 00075 #endif /* !STLSOFT_INCL_STLSOFT_H_STLSOFT */ 00076 #ifndef STLSOFT_INCL_STLSOFT_META_HPP_CAPABILITIES 00077 # include <stlsoft/meta/capabilities.hpp> 00078 #endif /* !STLSOFT_INCL_STLSOFT_META_HPP_CAPABILITIES */ 00079 00080 /* ///////////////////////////////////////////////////////////////////////// 00081 * Namespace 00082 */ 00083 00084 #ifndef _STLSOFT_NO_NAMESPACE 00085 namespace stlsoft 00086 { 00087 #endif /* _STLSOFT_NO_NAMESPACE */ 00088 00089 /* ///////////////////////////////////////////////////////////////////////// 00090 * Classes 00091 */ 00092 00093 #ifdef STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT 00094 00105 template< ss_typename_param_k T1 00106 , ss_typename_param_k T2 00107 , bool B 00108 > 00109 struct select_first_type_if 00110 { 00111 typedef T1 type; 00112 }; 00113 00114 # ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION 00115 00116 template< ss_typename_param_k T1 00117 , ss_typename_param_k T2 00118 > 00119 struct select_first_type_if<T1, T2, false> 00120 { 00121 typedef T2 type; 00122 }; 00123 00124 // Obsolete 00125 template< ss_typename_param_k T1 00126 , ss_typename_param_k T2 00127 , bool B 00128 > 00129 struct select_first_type 00130 { 00131 typedef T1 type; 00132 }; 00133 00134 template< ss_typename_param_k T1 00135 , ss_typename_param_k T2 00136 > 00137 struct select_first_type<T1, T2, false> 00138 { 00139 typedef T2 type; 00140 }; 00141 00142 # endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */ 00143 00144 #else /* ? STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT */ 00145 00146 template< ss_typename_param_k T1 00147 , ss_typename_param_k T2 00148 , bool B 00149 > 00150 struct select_first_type_if 00151 { 00152 private: 00153 template <bool> 00154 struct if_ 00155 { 00156 typedef T2 type; 00157 }; 00158 STLSOFT_TEMPLATE_SPECIALISATION 00159 struct if_<true> 00160 { 00161 typedef T1 type; 00162 }; 00163 00164 public: 00165 typedef ss_typename_type_k if_<B>::type type; 00166 }; 00167 00168 #endif /* STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT */ 00169 00170 /* ////////////////////////////////////////////////////////////////////// */ 00171 00172 #ifndef _STLSOFT_NO_NAMESPACE 00173 } // namespace stlsoft 00174 #endif /* _STLSOFT_NO_NAMESPACE */ 00175 00176 /* ////////////////////////////////////////////////////////////////////// */ 00177 00178 #endif /* !STLSOFT_INCL_STLSOFT_META_HPP_SELECT_FIRST_TYPE_IF */ 00179 00180 /* ///////////////////////////// end of file //////////////////////////// */