moRandImprSelect.h

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

// "moRandImprSelect.h"

// (c) OPAC Team, LIFL, 2003-2006

/* LICENCE TEXT
   
   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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