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 <comparator/moeoComparator.h>
#include <comparator/moeoFitnessThenDiversityComparator.h>
#include <diversity/moeoDiversityAssignment.h>
#include <fitness/moeoFitnessAssignment.h>
#include <replacement/moeoReplacement.h>

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

    typedef typename MOEOT::ObjectiveVector ObjectiveVector;


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoDiversityAssignment < MOEOT > & _diversityAssignment, moeoComparator < MOEOT > & _comparator) :
            fitnessAssignment (_fitnessAssignment), diversityAssignment (_diversityAssignment), comparator (_comparator)
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoDiversityAssignment < MOEOT > & _diversityAssignment) :
            fitnessAssignment (_fitnessAssignment), diversityAssignment (_diversityAssignment), comparator (defaultComparator)
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment, moeoComparator < MOEOT > & _comparator) :
            fitnessAssignment (_fitnessAssignment), diversityAssignment (defaultDiversity), comparator (_comparator)
    {}


    moeoEnvironmentalReplacement (moeoFitnessAssignment < MOEOT > & _fitnessAssignment) :
            fitnessAssignment (_fitnessAssignment), diversityAssignment (defaultDiversity), comparator (defaultComparator)
    {}


    void operator () (eoPop < MOEOT > &_parents, eoPop < MOEOT > &_offspring)
    {
        unsigned int sz = _parents.size();
        // merges offspring and parents into a global population
        _parents.reserve (_parents.size() + _offspring.size());
        std::copy (_offspring.begin(), _offspring.end(), back_inserter(_parents));
        // evaluates the fitness and the diversity of this global population
        fitnessAssignment (_parents);
        diversityAssignment (_parents);
        // remove individuals 1 by 1 and update the fitness values
        unsigned int worstIdx;
        ObjectiveVector worstObjVec;
        while (_parents.size() > sz)
        {
            // the individual to delete
            worstIdx = std::min_element(_parents.begin(), _parents.end(), comparator) - _parents.begin();
            worstObjVec = _parents[worstIdx].objectiveVector();
            // remove the woorst individual
            _parents[worstIdx] = _parents.back();
            _parents.pop_back();
            // update of the fitness and diversity values
            fitnessAssignment.updateByDeleting(_parents, worstObjVec);
            diversityAssignment.updateByDeleting(_parents, worstObjVec);

        }
        // clear the offspring population
        _offspring.clear ();
    }


protected:

    moeoFitnessAssignment < MOEOT > & fitnessAssignment;
    moeoDiversityAssignment < MOEOT > & diversityAssignment;
    moeoDummyDiversityAssignment < MOEOT > defaultDiversity;
    moeoFitnessThenDiversityComparator < MOEOT > defaultComparator;
    class Cmp
    {
    public:
        Cmp(moeoComparator < MOEOT > & _comp) : comp(_comp)
        {}
        bool operator()(const MOEOT & _moeo1, const MOEOT & _moeo2)
        {
            return comp(_moeo1,_moeo2);
        }
    private:
        moeoComparator < MOEOT > & comp;
    } comparator;

};

#endif /*MOEOENVIRONMENTALREPLACEMENT_H_ */

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