00001 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE) 00002 // 00003 // This file is part of Olena. 00004 // 00005 // Olena is free software: you can redistribute it and/or modify it under 00006 // the terms of the GNU General Public License as published by the Free 00007 // Software Foundation, version 2 of the License. 00008 // 00009 // Olena is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 // General Public License for more details. 00013 // 00014 // You should have received a copy of the GNU General Public License 00015 // along with Olena. If not, see <http://www.gnu.org/licenses/>. 00016 // 00017 // As a special exception, you may use this file as part of a free 00018 // software project without restriction. Specifically, if other files 00019 // instantiate templates or use macros or inline functions from this 00020 // file, or you compile this file and link it with other files to produce 00021 // an executable, this file does not by itself cause the resulting 00022 // executable to be covered by the GNU General Public License. This 00023 // exception does not however invalidate any other reasons why the 00024 // executable file might be covered by the GNU General Public License. 00025 00026 #ifndef MLN_METAL_BOOL_HH 00027 # define MLN_METAL_BOOL_HH 00028 00032 00033 # include <string> 00034 00035 00036 # define mlc_bool(B) mln::metal::bool_<( B )> 00037 00038 // The macro above is very convenient for static checks on Boolean 00039 // expressions, e.g., "mlc_bool(m == n)::check();" 00040 00041 00042 00043 namespace mln 00044 { 00045 00046 namespace metal 00047 { 00048 00049 // Fwd decl. 00050 template <bool b> struct bool_; 00051 00052 00054 template <> 00055 struct bool_< true > 00056 { 00057 typedef bool_<true> check_t; 00058 static const bool value = true; 00059 typedef bool_<true> eval; 00060 static void check(); 00061 std::string name() const { return "true"; } 00062 }; 00063 00064 typedef bool_<true> true_; 00065 00066 00068 template <> 00069 struct bool_< false > 00070 { 00071 typedef bool_<false> check_not_t; 00072 static const bool value = false; 00073 typedef bool_<false> eval; 00074 static void check_not(); 00075 std::string name() const { return "false"; } 00076 }; 00077 00078 typedef bool_<false> false_; 00079 00080 00081 # ifndef MLN_INCLUDE_ONLY 00082 00083 inline 00084 void true_::check() 00085 { 00086 } 00087 00088 inline 00089 void false_::check_not() 00090 { 00091 } 00092 00093 # endif // ! MLN_INCLUDE_ONLY 00094 00095 } // end of namespace mln::metal 00096 00097 } // end of namespace mln 00098 00099 00100 # include <mln/metal/bexpr.hh> 00101 00102 00103 #endif // ! MLN_METAL_BOOL_HH
1.7.1