00001 // Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6), 00002 // département Systèmes Répartis Coopératifs (SRC), Université Pierre 00003 // et Marie Curie. 00004 // 00005 // This file is part of Spot, a model checking library. 00006 // 00007 // Spot is free software; you can redistribute it and/or modify it 00008 // under the terms of the GNU General Public License as published by 00009 // the Free Software Foundation; either version 2 of the License, or 00010 // (at your option) any later version. 00011 // 00012 // Spot is distributed in the hope that it will be useful, but WITHOUT 00013 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 00014 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 00015 // License for more details. 00016 // 00017 // You should have received a copy of the GNU General Public License 00018 // along with Spot; see the file COPYING. If not, write to the Free 00019 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 00020 // 02111-1307, USA. 00021 00024 #ifndef SPOT_LTLAST_CONSTANT_HH 00025 # define SPOT_LTLAST_CONSTANT_HH 00026 00027 #include "formula.hh" 00028 00029 namespace spot 00030 { 00031 namespace ltl 00032 { 00033 00036 class constant : public formula 00037 { 00038 public: 00039 enum type { False, True }; 00040 virtual void accept(visitor& v); 00041 virtual void accept(const_visitor& v) const; 00042 00044 type val() const; 00046 const char* val_name() const; 00047 00049 static constant* true_instance(); 00051 static constant* false_instance(); 00052 00053 protected: 00054 constant(type val); 00055 virtual ~constant(); 00056 00057 private: 00058 type val_; 00059 }; 00060 00061 } 00062 } 00063 00064 #endif // SPOT_LTLAST_CONSTANT_HH