moRandImprSelect.h

/* 
* <moRandImprSelect.h>
* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
* (C) OPAC Team, LIFL, 2002-2007
*
* Sébastien Cahon, Jean-Charles Boisson (Jean-Charles.Boisson@lifl.fr)
*
* This software is governed by the CeCILL license under French law and
* abiding by the rules of distribution of free software.  You can  use,
* modify and/ or redistribute the software under the terms of the CeCILL
* license as circulated by CEA, CNRS and INRIA at the following URL
* "http://www.cecill.info".
*
* As a counterpart to the access to the source code and  rights to copy,
* modify and redistribute granted by the license, users are provided only
* with a limited warranty  and the software's author,  the holder of the
* economic rights,  and the successive licensors  have only  limited liability.
*
* In this respect, the user's attention is drawn to the risks associated
* with loading,  using,  modifying and/or developing or reproducing the
* software by the user in light of its specific status of free software,
* that may mean  that it is complicated to manipulate,  and  that  also
* therefore means  that it is reserved for developers  and  experienced
* professionals having in-depth computer knowledge. Users are therefore
* encouraged to load and test the software's suitability as regards their
* requirements in conditions enabling the security of their systems and/or
* data to be ensured and,  more generally, to use and operate it in the
* same conditions as regards security.
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL license and that you accept its terms.
*
* ParadisEO WebSite : http://paradiseo.gforge.inria.fr
* Contact: paradiseo-help@lists.gforge.inria.fr
*
*/

#ifndef __moRandImprSelect_h
#define __moRandImprSelect_h

#include <vector>

#include <utils/eoRNG.h>
#include "moMoveSelect.h"


template < class M > class moRandImprSelect:public moMoveSelect < M >
{

public:

  typedef typename M::EOType::Fitness Fitness;


  void init (const Fitness & __fit)
  {
    init_fit = __fit;
    vect_better_fit.clear ();
    vect_better_moves.clear ();
  }


  bool update (const M & __move, const Fitness & __fit)
  {

    if (__fit > init_fit)
      {

        vect_better_fit.push_back (__fit);
        vect_better_moves.push_back (__move);
      }

    return true;
  }


  void operator   () (M & __move, Fitness & __fit) throw (EmptySelection)
  {

    if (!vect_better_fit.empty ())
      {

        unsigned n = rng.random (vect_better_fit.size ());

        __move = vect_better_moves[n];
        __fit = vect_better_fit[n];
      }
    else
      throw EmptySelection ();
  }

private:

  Fitness init_fit;

  std::vector < Fitness > vect_better_fit;

  std::vector < M > vect_better_moves;
};

#endif

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