randnum.h

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/*
 * Author: Grant Tang, 03/10/2008 (gtang@bcm.edu)
 * Copyright (c) 2000-2006 Baylor College of Medicine
 * 
 * This software is issued under a joint BSD/GNU license. You may use the
 * source code in this file under either license. However, note that the
 * complete EMAN2 and SPARX software packages have some GPL dependencies,
 * so you are responsible for compliance with the licenses of these packages
 * if you opt to use BSD licensing. The warranty disclaimer below holds
 * in either instance.
 * 
 * This complete copyright notice must be included in any revised version of the
 * source code. Additional authorship citations may be added, but existing
 * author citations must be preserved.
 * 
 * This program 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 2 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * */
 
#ifndef randnum_h__
#define randnum_h__ 
 
#include <gsl/gsl_rng.h>
 
namespace EMAN
{
        class Randnum {
          public:
                static Randnum * Instance();
                static Randnum * Instance(const gsl_rng_type * _t);
                                
                void set_seed(unsigned long long seed);
                
                unsigned long long get_seed();
                
                long long get_irand(long long lo, long long hi) const;
                
                float get_frand(double lo=0.0, double hi=1.0) const;
                
                float get_frand_pos(double lo=0.0, double hi=1.0) const;
                
                float get_gauss_rand(float mean, float sigma) const;
                
            void print_generator_type() const;
          
          protected:
                Randnum();
                Randnum(const Randnum&);
                
                explicit Randnum(const gsl_rng_type * _t);
                
                ~Randnum();
                
                
                
          private:
                const static gsl_rng_type * T;
        static gsl_rng * r;
        static unsigned long long _seed;
        
        static Randnum* _instance;
        }; 
        
}
 
#endif  //randnum_h__