00001 // Copyright (C) 2003, 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 00024 #ifndef SPOT_LTLAST_REFFORMULAE_HH 00025 # define SPOT_LTLAST_REFFORMULAE_HH 00026 00027 #include "formula.hh" 00028 00029 namespace spot 00030 { 00031 namespace ltl 00032 { 00033 00035 class ref_formula : public formula 00036 { 00037 protected: 00038 virtual ~ref_formula(); 00039 ref_formula(); 00040 void ref_(); 00041 bool unref_(); 00043 unsigned ref_count_(); 00044 private: 00045 unsigned ref_counter_; 00046 }; 00047 00048 } 00049 } 00050 00051 #endif // SPOT_LTLAST_REFFORMULAE_HH