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constant.hh
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1 // -*- coding: utf-8 -*-
2 // Copyright (C) 2009, 2010, 2012, 2013, 2014 Laboratoire de Recherche
3 // et Développement de l'Epita (LRDE).
4 // Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
5 //
6 // This file is part of Spot, a model checking library.
7 //
8 // Spot is free software; you can redistribute it and/or modify it
9 // under the terms of the GNU General Public License as published by
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15 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 // License for more details.
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20 
23 #ifndef SPOT_LTLAST_CONSTANT_HH
24 # define SPOT_LTLAST_CONSTANT_HH
25 
26 #include "formula.hh"
27 
28 namespace spot
29 {
30  namespace ltl
31  {
32 
35  class SPOT_API constant : public formula
36  {
37  public:
38  enum type { False, True, EmptyWord };
39  virtual void accept(visitor& v) const;
40 
42  type val() const
43  {
44  return val_;
45  }
46 
48  const char* val_name() const;
49 
50  virtual std::string dump() const;
51 
53  static constant* true_instance() { return &true_instance_; }
55  static constant* false_instance() { return &false_instance_; }
57  static constant* empty_word_instance() { return &empty_word_instance_; }
58 
59  protected:
60  constant(type val);
61  virtual ~constant();
62 
63  private:
64  type val_;
65 
66  static constant true_instance_;
67  static constant false_instance_;
68  static constant empty_word_instance_;
69  // If you add new constants here, be sure to update the
70  // formula::formula() constructor.
71  };
72 
73 
78  inline
79  const constant*
80  is_constant(const formula* f)
81  {
82  if (f->kind() != formula::Constant)
83  return 0;
84  return static_cast<const constant*>(f);
85  }
86  }
87 }
88 
89 #endif // SPOT_LTLAST_CONSTANT_HH

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