spot  0.9.1
constant.hh
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00001 // Copyright (C) 2009, 2010, 2012 Laboratoire de Recherche et
00002 // Développement de l'Epita (LRDE).
00003 // Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
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, EmptyWord };
00040       virtual void accept(visitor& v) const;
00041 
00043       type val() const;
00045       const char* val_name() const;
00046 
00047       virtual std::string dump() const;
00048 
00050       static constant* true_instance() { return &true_instance_; }
00052       static constant* false_instance() { return &false_instance_; }
00054       static constant* empty_word_instance() { return &empty_word_instance_; }
00055 
00056     protected:
00057       constant(type val);
00058       virtual ~constant();
00059 
00060     private:
00061       type val_;
00062 
00063       static constant true_instance_;
00064       static constant false_instance_;
00065       static constant empty_word_instance_;
00066       // If you add new constants here, be sure to update the
00067       // formula::formula() constructor.
00068     };
00069 
00070 
00075     inline
00076     const constant*
00077     is_constant(const formula* f)
00078     {
00079       if (f->kind() != formula::Constant)
00080         return 0;
00081       return static_cast<const constant*>(f);
00082     }
00083   }
00084 }
00085 
00086 #endif // SPOT_LTLAST_CONSTANT_HH

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