constant.hh

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00001 // Copyright (C) 2009 Laboratoire de Recherche et Développement
00002 // de l'Epita (LRDE).
00003 // Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
00004 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
00005 // et Marie Curie.
00006 //
00007 // This file is part of Spot, a model checking library.
00008 //
00009 // Spot is free software; you can redistribute it and/or modify it
00010 // under the terms of the GNU General Public License as published by
00011 // the Free Software Foundation; either version 2 of the License, or
00012 // (at your option) any later version.
00013 //
00014 // Spot is distributed in the hope that it will be useful, but WITHOUT
00015 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
00016 // or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
00017 // License for more details.
00018 //
00019 // You should have received a copy of the GNU General Public License
00020 // along with Spot; see the file COPYING.  If not, write to the Free
00021 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
00022 // 02111-1307, USA.
00023 
00026 #ifndef SPOT_LTLAST_CONSTANT_HH
00027 # define SPOT_LTLAST_CONSTANT_HH
00028 
00029 #include "formula.hh"
00030 
00031 namespace spot
00032 {
00033   namespace ltl
00034   {
00035 
00038     class constant : public formula
00039     {
00040     public:
00041       enum type { False, True };
00042       virtual void accept(visitor& v);
00043       virtual void accept(const_visitor& v) const;
00044 
00046       type val() const;
00048       const char* val_name() const;
00049 
00050       virtual std::string dump() const;
00051 
00053       static constant* true_instance();
00055       static constant* false_instance();
00056 
00057     protected:
00058       constant(type val);
00059       virtual ~constant();
00060 
00061     private:
00062       type val_;
00063     };
00064 
00065   }
00066 }
00067 
00068 #endif // SPOT_LTLAST_CONSTANT_HH

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