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ltlast/constant.hh

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00001 // Copyright (C) 2003  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 
00022 #ifndef SPOT_LTLAST_CONSTANT_HH
00023 # define SPOT_LTLAST_CONSTANT_HH
00024 
00025 #include "formula.hh"
00026 
00027 namespace spot
00028 {
00029   namespace ltl
00030   {
00031 
00033     class constant : public formula
00034     {
00035     public:
00036       enum type { False, True };
00037       virtual void accept(visitor& v);
00038       virtual void accept(const_visitor& v) const;
00039 
00041       type val() const;
00043       const char* val_name() const;
00044 
00046       static constant* true_instance();
00048       static constant* false_instance();
00049 
00050     protected:
00051       constant(type val);
00052       virtual ~constant();
00053 
00054     private:
00055       type val_;
00056     };
00057 
00058   }
00059 }
00060 
00061 #endif // SPOT_LTLAST_CONSTANT_HH

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