gafactorydefaults.h

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/*
    
  This file is a part of MOGAL, a Multi-Objective Genetic Algorithm
  Library.
  
  Copyright (C) 2008-2012 Jori Liesenborgs

  Contact: jori.liesenborgs@gmail.com

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  
  USA

*/

#ifndef MOGAL_GAFACTORYDEFAULTS_H

#define MOGAL_GAFACTORYDEFAULTS_H

#include "mogalconfig.h"
#include "gafactory.h"
#include <stdlib.h>
#include <cmath>

namespace mogal
{

// NOTE: the virtual inheritance is of extreme importance here!

class MOGAL_IMPORTEXPORT GAFactoryDefaults : public virtual GAFactory
{
public:
        ~GAFactoryDefaults()                                                                            { }

protected:
        GAFactoryDefaults();



        void commonBreed(int startOffset, const std::vector<GenomeWrapper> &population, 
                         std::vector<GenomeWrapper> &newPopulation);

        int pickGenome(int num) const
        {
                double x = pickDouble();
                double val = x*(double)num; 
                return (int)val;
        }

        int pickGenome(double beta, size_t populationSize) const
        {
                double x = pickDouble();
                double val = (1.0-std::pow(x, 1.0/(1.0+beta)))*((double)populationSize);
                return (int)val;
        }

        double pickDouble() const { return getRandomNumberGenerator()->pickRandomNumber(); }
};

} // end namespace

#endif // MOGAL_GAFACTORYDEFAULTS_H