Random.hpp

/*
    Copyright 2008,2009,2012 Stéphane De Mita, Mathieu Siol
    Adapted from MStrat, developed by Charles-Edouard Coste,
    Thomas M. Bataillon, Mathieu Cotisson, Guy Decoux, Chistophe Rozale,
    Daniel J. Schoen and Jacques L. David.
    
    This file is part of the EggLib library.

    EggLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    EggLib is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with EggLib.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef EGGLIB_RANDOM_HPP
#define EGGLIB_RANDOM_HPP

namespace egglib {

    class Random {
       public:
            Random();

            Random(double seed1, double seed2);
            
            double erand(double expectation);

            unsigned int irand(unsigned int max);

            unsigned int prand(double p);

            double nrand();
            
            unsigned int grand(double);

            double uniform();
            
            double seed1() const;

            double seed2() const;
            
            void seed1(double);

            void seed2(double);

        private:
            // First seed
            double _seed1;
            
            // Second seed
            double _seed2;
            
            /* since the normal random generator draws two numbers at
             * a time, one is cached and returned at any subsequent call
             */
            bool b_ncached;
            double v_ncached;
            
    };
}

#endif