eoUpdateUnderConstraint.h

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

//-----------------------------------------------------------------------------
// eoUpdateUnderConstraint.h
// (c) OPAC 2007
/*
    Contact: paradiseo-help@lists.gforge.inria.fr
 */
//-----------------------------------------------------------------------------

#ifndef _EOUPDATEIUNDERCONSTRAINT_H
#define _EOUPDATEIUNDERCONSTRAINT_H

//-----------------------------------------------------------------------------
#include <eoParticleBestUpdater.h>


template < class POT , class CSTYPE > class eoUpdateUnderConstraint:public eoParticleBestUpdater < POT >
{

public:

    eoUpdateUnderConstraint(const CSTYPE & _epsilon):epsilon(_epsilon) {}

    void operator  () (POT & _po)
    {
        if ((_po.fitness () - _po.best ()) >= epsilon)
        {
            // update positions
            for (unsigned i = 0; i < _po.size (); i++){
                _po.bestPositions[i] = _po[i];
            }
            // invalidate the best fitness, just "semantic" because the best fitness is updated below
            _po.invalidateBest();

            // update local best fitness
            _po.best (_po.fitness ());
        }
    }

protected:
     const CSTYPE & epsilon;

};

#endif /*_EOUPDATEIUNDERCONSTRAINT_H */

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