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

#include <selection/moeoSelectOne.h>
#include <selection/moeoSelectors.h>

/**
 * Selection strategy that selects ONE individual by using roulette wheel process.
 * WARNING This selection only uses fitness values (and not diversity values).
 */
template < class MOEOT >
class moeoRouletteSelect:public moeoSelectOne < MOEOT >
  {
  public:

    /**
     * Ctor.
     * @param _tSize the number of individuals in the tournament (default: 2)	 
     */
    moeoRouletteSelect (unsigned int _tSize = 2) : tSize (_tSize)
    {
      // consistency check
      if (tSize < 2)
        {
          std::
          cout << "Warning, Tournament size should be >= 2\nAdjusted to 2\n";
          tSize = 2;
        }
    }


    /**
     * Apply the tournament to the given population
     * @param _pop the population
     */
    const MOEOT & operator  () (const eoPop < MOEOT > & _pop)
    {
      // use the selector
      return mo_roulette_wheel(_pop,tSize);
    }


  protected:

    /** size */
    double & tSize;

  };

#endif /*MOEOROULETTESELECT_H_ */