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 00022 #ifndef SPOT_MISC_BDDALLOC_HH 00023 # define SPOT_MISC_BDDALLOC_HH 00024 00025 #include <list> 00026 #include <utility> 00027 00028 namespace spot 00029 { 00030 00032 class bdd_allocator 00033 { 00034 public: 00036 bdd_allocator(); 00038 static void initialize(); 00040 int allocate_variables(int n); 00042 void release_variables(int base, int n); 00043 protected: 00044 static bool initialized; 00045 static int varnum; 00046 int lvarnum; 00047 typedef std::pair<int, int> pos_lenght_pair; 00048 typedef std::list<pos_lenght_pair> free_list_type; 00049 free_list_type free_list; 00050 private: 00052 void extvarnum(int more); 00053 }; 00054 00055 } 00056 00057 #endif // SPOT_MISC_BDDALLOC_HH