moeoEnvironmentalReplacement.h

// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// moeoEnvironmentalReplacement.h
// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
/*
    This library...

    Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
 */
//-----------------------------------------------------------------------------

#ifndef MOEOENVIRONMENTALREPLACEMENT_H_
#define MOEOENVIRONMENTALREPLACEMENT_H_

#include <moeoReplacement.h>
#include <moeoComparator.h>
#include <moeoFitnessAssignment.h>
#include <moeoDiversityAssignment.h>

template < class MOEOT > class moeoEnvironmentalReplacement:public moeoReplacement < MOEOT >
{
public:

    typedef typename MOEOT::ObjectiveVector ObjectiveVector;


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness, moeoDiversityAssignment < MOEOT > & _evalDiversity, moeoComparator < MOEOT > & _comparator) :
            evalFitness (_evalFitness), evalDiversity (_evalDiversity), comparator (_comparator)
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness, moeoDiversityAssignment < MOEOT > & _evalDiversity) :
            evalFitness (_evalFitness), evalDiversity (_evalDiversity), comparator (*(new moeoFitnessThenDiversityComparator < MOEOT >))
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness, moeoComparator < MOEOT > & _comparator) :
            evalFitness (_evalFitness), evalDiversity (*(new moeoDummyDiversityAssignment < MOEOT >)), comparator (_comparator)
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _evalFitness) :
            evalFitness (_evalFitness), evalDiversity (*(new moeoDummyDiversityAssignment < MOEOT >)), comparator (*(new moeoFitnessThenDiversityComparator < MOEOT >))
    {}


    void operator () (eoPop < MOEOT > &_parents, eoPop < MOEOT > &_offspring)
    {
        unsigned sz = _parents.size();
        // merges offspring and parents into a global population
        _parents.reserve (_parents.size() + _offspring.size());
        copy (_offspring.begin(), _offspring.end(), back_inserter(_parents));
        // evaluates the fitness and the diversity of this global population
        evalFitness (_parents);
        evalDiversity (_parents);
        // remove individuals 1 by 1 and update the fitness values
        Cmp cmp(comparator);
        ObjectiveVector worstObjVec;
        while (_parents.size() > sz)
        {
            std::sort (_parents.begin(), _parents.end(), cmp);
            worstObjVec = _parents[_parents.size()-1].objectiveVector();
            _parents.resize(_parents.size()-1);
            evalFitness.updateByDeleting(_parents, worstObjVec);
            evalDiversity.updateByDeleting(_parents, worstObjVec);
        }
        // clear the offspring population
        _offspring.clear ();
    }


protected:

    moeoFitnessAssignment < MOEOT > & evalFitness;
    moeoDiversityAssignment < MOEOT > & evalDiversity;
    moeoComparator < MOEOT > & comparator;


    class Cmp
    {
    public:

        Cmp(moeoComparator < MOEOT > & _comparator) : comparator(_comparator)
        {}


        bool operator()(const MOEOT & _moeo1, const MOEOT & _moeo2)
        {
            return comparator(_moeo1,_moeo2);
        }


    private:

        moeoComparator < MOEOT > & comparator;

    };

};

#endif /*MOEOENVIRONMENTALREPLACEMENT_H_ */

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