InvertedFitnessStrategy.h

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/***************************************************************************
 *   Copyright (C) 2005-2009 by Robot Group Leipzig                        *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
 *    guettler@informatik.uni-leipzig.de                                   *
 *    jhoffmann@informatik.uni-leipzig.de                                  *
 *    joergweide84@aol.com (robot12)                                       *
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 ***************************************************************************
 *                                                                         *
 *   This fitness strategy is for calculating the invert of a other        *
 *   fitness strategy.                                                     *
 *                                                                         *
 *   $Log: InvertedFitnessStrategy.h,v $
 *   Revision 1.2  2009/07/06 15:06:35  robot12
 *   bugfix
 *
 *   Revision 1.1  2009/07/02 15:24:53  robot12
 *   update and add new class InvertedFitnessStrategy
 *
 *
 *
 ***************************************************************************/

#ifndef INVERTEDFITNESSSTRATEGY_H_
#define INVERTEDFITNESSSTRATEGY_H_

//forward declaration
class Individual;

//ga_tools includes
#include "IFitnessStrategy.h"

/**
 * This strategy calculate the invert to a other strategy. This can be used for other optimization targets than zero.
 * For example. Is the optimization target of the alg. infinity, than the inverted target is zero -> so the alg. can
 * optimize again zero and you have you infinity target.
 */
class InvertedFitnessStrategy: public IFitnessStrategy {
public:
        /**
         * constructor
         * Needs a other fitness strategy, which should be inverted.
         * @param strategy (IFitnessStrategy*) the other fitness strategy
         */
        InvertedFitnessStrategy(IFitnessStrategy* strategy);

        /**
         * default destructor
         */
        virtual ~InvertedFitnessStrategy();

        /**
         * returns the inverse fitness value what the other strategy returns for the individual "individual".
         *
         * @param individual (const Individual*) calculate the fitness for this individual
         * @return (double) The fitness value
         */
        virtual double getFitness(const Individual* individual);

protected:
        /**
         * The other strategy
         */
        IFitnessStrategy* m_strategy;

private:
        /**
         * disable the default constructor
         */
        InvertedFitnessStrategy();
};

#endif /* INVERTEDFITNESSSTRATEGY_H_ */

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