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ltlast/constant.hh

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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 00035 class constant : public formula 00036 { 00037 public: 00038 enum type { False, True }; 00039 virtual void accept(visitor& v); 00040 virtual void accept(const_visitor& v) const; 00041 00043 type val() const; 00045 const char* val_name() const; 00046 00048 static constant* true_instance(); 00050 static constant* false_instance(); 00051 00052 protected: 00053 constant(type val); 00054 virtual ~constant(); 00055 00056 private: 00057 type val_; 00058 }; 00059 00060 } 00061 } 00062 00063 #endif // SPOT_LTLAST_CONSTANT_HH

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