moeoParetoObjectiveVectorComparator.h

/* 
* <moeoParetoObjectiveVectorComparator.h>
* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
* (C) OPAC Team, LIFL, 2002-2007
*
* Arnaud Liefooghe
*
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*
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//-----------------------------------------------------------------------------

#ifndef MOEOPARETOOBJECTIVEVECTORCOMPARATOR_H_
#define MOEOPARETOOBJECTIVEVECTORCOMPARATOR_H_

#include <comparator/moeoObjectiveVectorComparator.h>

template < class ObjectiveVector >
class moeoParetoObjectiveVectorComparator : public moeoObjectiveVectorComparator < ObjectiveVector >
{
public:

    const bool operator()(const ObjectiveVector & _objectiveVector1, const ObjectiveVector & _objectiveVector2)
    {
        bool dom = false;
        for (unsigned int i=0; i<ObjectiveVector::nObjectives(); i++)
        {
            // first, we have to check if the 2 objective values are not equal for the ith objective
            if ( fabs(_objectiveVector1[i] - _objectiveVector2[i]) > ObjectiveVector::Traits::tolerance() )
            {
                // if the ith objective have to be minimized...
                if (ObjectiveVector::minimizing(i))
                {
                    if (_objectiveVector1[i] > _objectiveVector2[i])
                    {
                        dom = true;             //_objectiveVector1[i] is not better than _objectiveVector2[i]
                    }
                    else
                    {
                        return false;   //_objectiveVector2 cannot dominate _objectiveVector1
                    }
                }
                // if the ith objective have to be maximized...
                else if (ObjectiveVector::maximizing(i))
                {
                    if (_objectiveVector1[i] < _objectiveVector2[i])
                    {
                        dom = true;             //_objectiveVector1[i] is not better than _objectiveVector2[i]
                    }
                    else
                    {
                        return false;   //_objectiveVector2 cannot dominate _objectiveVector1
                    }
                }
            }
        }
        return dom;
    }

};

#endif /*MOEOPARETOOBJECTIVEVECTORCOMPARATOR_H_*/

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