modgray.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_MISC_MODGRAY_HH
00023 # define SPOT_MISC_MODGRAY_HH
00024 
00025 namespace spot
00026 {
00027 
00071   class loopless_modular_mixed_radix_gray_code
00072   {
00073   public:
00077     loopless_modular_mixed_radix_gray_code(int n);
00078 
00079     virtual ~loopless_modular_mixed_radix_gray_code();
00080 
00090 
00092     virtual void a_first(int j) = 0;
00096     virtual void a_next(int j) = 0;
00098     virtual bool a_last(int j) const = 0;
00100 
00103 
00107     void first();
00108 
00113     bool
00114     last() const
00115     {
00116       return f_[0] == n_;
00117     }
00118 
00120     bool
00121     done() const
00122     {
00123       return done_;
00124     }
00125 
00132     int next();
00134 
00135   protected:
00136     int n_;
00137     bool done_;
00138     int* a_;
00139     int* f_;
00140     int* m_;
00141     int* s_;
00142     int* non_one_radixes_;
00143   };
00144 
00145 } // spot
00146 
00147 # endif // SPOT_MISC_MODGRAY_HH

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