insteadoftheworst.h

free library of genetic algorithms

/*
    cpplibga, free library of genetic algorithms.
    Copyright (C) 2003  Burger Y.A. (aka Jo Kruger)

    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

Contacts:

   address: planet Terra
   e-mail:  [e-mail]
            [e-mail]
*/

#ifndef __CPPLIBGA_PLACING_INSTEADOFTHEWORST_H__
#define __CPPLIBGA_PLACING_INSTEADOFTHEWORST_H__

#include <cpplibga/Predicates.h>
#include <cpplibga/Types.h>

namespace cpplibga
{
    namespace placing
    {
	class InsteadOfTheWorst
	{
	    public:
            
                InsteadOfTheWorst() : count(0)
                {
                }
            
                counter_type getNumberOfReplacedSolutions() const {return count;}

                template<typename S, typename P, typename A>
                void place(S* solution,
		           P* population,
		           A* allocator)
	        {
		    typedef typename P::iterator Iter;
                    
		    Iter popbegin=population->begin();
		    Iter popend=population->end();
		    Iter worst=std::min_element(popbegin, popend, XLessThanY());
		    
                    if((*worst)->calcFitness() < solution->calcFitness())
		    {
		        allocator->Delete(*worst);
		        *worst=solution;
                        ++count;
		    }
		    else
		    {
		        allocator->Delete(solution);
		    }
	        }

            private:

                counter_type count;
	};
    }
}

#endif