symbol.hh

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00001 // Copyright (C) 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 
00022 #ifndef SPOT_EVTGBA_SYMBOL_HH
00023 # define SPOT_EVTGBA_SYMBOL_HH
00024 
00025 #include <string>
00026 #include <iosfwd>
00027 #include <map>
00028 #include <set>
00029 
00030 namespace spot
00031 {
00032   class symbol
00033   {
00034   public:
00035     static const symbol* instance(const std::string& name);
00036     const std::string& name() const;
00037 
00039     static unsigned instance_count();
00041     static std::ostream& dump_instances(std::ostream& os);
00042 
00043     void ref() const;
00044     void unref() const;
00045 
00046   protected:
00047     int ref_count_() const;
00048     symbol(const std::string* name);
00049     ~symbol();
00050     typedef std::map<const std::string, const symbol*> map;
00051     static map instances_;
00052   private:
00053     symbol(const symbol&); 
00054     const std::string* name_;
00055     mutable int refs_;
00056   };
00057 
00058   class rsymbol
00059   {
00060   public:
00061     rsymbol(const symbol* s): s_(s)
00062     {
00063     }
00064 
00065     rsymbol(const std::string& s): s_(symbol::instance(s))
00066     {
00067     }
00068 
00069     rsymbol(const char* s): s_(symbol::instance(s))
00070     {
00071     }
00072 
00073     rsymbol(const rsymbol& rs): s_(rs.s_)
00074     {
00075       s_->ref();
00076     }
00077 
00078     ~rsymbol()
00079     {
00080       s_->unref();
00081     }
00082 
00083     operator const symbol*() const
00084     {
00085       return s_;
00086     }
00087 
00088     const rsymbol&
00089     operator=(const rsymbol& rs)
00090     {
00091       if (this != &rs)
00092         {
00093           this->~rsymbol();
00094           new (this) rsymbol(rs);
00095         }
00096       return *this;
00097     }
00098 
00099     bool
00100     operator==(const rsymbol& rs) const
00101     {
00102       return s_ == rs.s_;
00103     }
00104 
00105     bool
00106     operator!=(const rsymbol& rs) const
00107     {
00108       return s_ != rs.s_;
00109     }
00110 
00111     bool
00112     operator<(const rsymbol& rs) const
00113     {
00114       return s_ < rs.s_;
00115     }
00116 
00117   private:
00118     const symbol* s_;
00119   };
00120 
00121   typedef std::set<const symbol*> symbol_set;
00122   typedef std::set<rsymbol> rsymbol_set;
00123 
00124 }
00125 
00126 #endif // SPOT_EVTGBA_SYMBOL_HH

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