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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 
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

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