Add moPopBitsNeighbor.h moPopBitsRndNeighborhood.h and problems/eval/moPopBitsEval.h which the population neighbor by flipping bit

git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@1909 331e1502-861f-0410-8da2-ba01fb791d7f

trunk/paradiseo-mo/src/problems/eval/moPopBitsEval.h

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+/*
+  <moPopBitsEval.h>
+  Copyright (C) DOLPHIN Project-Team, INRIA Lille - Nord Europe, 2006-2010
+
+  Sebastien Verel, Arnaud Liefooghe, Jeremie Humeau
+
+  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 moPopBitsEval_H
+#define moPopBitsEval_H
+
+#include <eoFunctor.h>
+#include <eval/moEval.h>
+
+/**
+ * Class to compute the fitness of the solution-set after one bit flip of several solutions
+ */
+template<class Neighbor>
+class moPopBitsEval : public moEval<Neighbor>
+{
+public:
+  typedef typename Neighbor::EOT EOT;
+  typedef typename Neighbor::SUBEOT SUBEOT; // type of the solution
+
+  typedef typename SUBEOT::Fitness SUBFitness; // fitness type of the solution
+
+  /**
+   * Default constructor
+   *
+   * @param _eval evaluation function of the solution
+   * @param _p exponent of the p-norm to compute the fitness of the solution-set 
+   */
+  moPopBitsEval(eoEvalFunc<SUBEOT>& _eval, unsigned int _p) : eval(_eval), p(_p) {
+  }
+
+  /**
+   * Compute the fitness of the neighbor after the bit flip mutations
+   *
+   * @param _sol the solution-set
+   * @param _n the neighbor which is supposed to be a "bits" neighbor
+   */
+  void operator()(EOT& _sol, Neighbor& _n) {
+    double fit = 0;
+
+    for(unsigned int i = 0; i < _sol.size(); i++) {
+      if (_n.mutate[i]) {
+	// save the fitness of the solution i
+	SUBFitness f = _sol[i].fitness();
+	
+	// modify the solution
+	_sol[i][ _n.bits[i] ] = !_sol[i][ _n.bits[i] ];
+	_sol[i].invalidate();
+
+	// evaluation of the solution
+	eval(_sol[i]);
+	
+	// save the fitness in the neighbor
+	_n.fitSol[i] = _sol[i].fitness();
+	
+	// compute the fitness of the solution-set
+	fit += pow((double) _sol[i].fitness(), (int) p);
+	
+	// come back to the fitness of the initial solution
+	_sol[i].fitness(f);	
+	_sol[i][ _n.bits[i] ] = !_sol[i][ _n.bits[i] ];
+      } else 
+	// compute the fitness of the solution-set
+	fit += pow((double) _sol[i].fitness(), (int) p);
+	
+    }
+
+    fit = pow((double) fit, (double)1/p);
+	
+    _n.fitness(fit);
+  }
+
+private:
+  eoEvalFunc<SUBEOT> & eval;
+  unsigned int p;
+
+};
+
+#endif