spot  0.8.2
random.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_RANDOM_HH
00023 # define SPOT_MISC_RANDOM_HH
00024 
00025 # include <cmath>
00026 
00027 namespace spot
00028 {
00032 
00036   void srand(unsigned int seed);
00037 
00042   int rrand(int min, int max);
00043 
00048   int mrand(int max);
00049 
00054   double drand();
00055 
00062   double nrand();
00063 
00069   double bmrand();
00070 
00082   template<double (*gen)()>
00083   class barand
00084   {
00085   public:
00086     barand(int n, double p)
00087       : n_(n), m_(n * p), s_(sqrt(n * p * (1 - p)))
00088     {
00089     }
00090 
00091     int
00092     rand() const
00093     {
00094       int res;
00095 
00096       for (;;)
00097         {
00098           double x = gen() * s_ + m_;
00099           if (x < 0.0)
00100             continue;
00101           res = static_cast<int> (x);
00102           if (res <= n_)
00103             break;
00104         }
00105       return res;
00106     }
00107   protected:
00108     const int n_;
00109     const double m_;
00110     const double s_;
00111   };
00112 
00117   int prand(double p);
00119 }
00120 
00121 #endif // SPOT_MISC_RANDOM_HH

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