add elitist replacement

git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@195 331e1502-861f-0410-8da2-ba01fb791d7f

branches/paradiseo-moeo-1.0/src/moeoElitistReplacement.h

@@ -0,0 +1,114 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// moeoElitistReplacement.h
+// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
+/*
+    This library...
+
+    Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
+ */
+//-----------------------------------------------------------------------------
+
+
+#ifndef MOEOELITISTREPLACEMENT_H_
+#define MOEOELITISTREPLACEMENT_H_
+
+//-----------------------------------------------------------------------------
+#include <moeoReplacement.h>
+#include <moeoComparator.h>
+#include <moeoFitnessAssignment.h>
+#include <moeoDiversityAssignment.h>
+//----------------------------------------------------------------------------- 
+
+
+/**
+ * Elitist replacement strategy for multi-objective optimization.
+ */
+template < class MOEOT > class moeoElitistReplacement:public moeoReplacement <
+  MOEOT >
+{
+
+public:
+
+	/** Full constructor */
+moeoElitistReplacement (moeoFitnessAssignment < MOEOT > &_evalFitness, moeoDiversityAssignment < MOEOT > &_evalDiversity, moeoComparator < MOEOT > _comparator):evalFitness (_evalFitness), evalDiversity (_evalDiversity),
+    comparator
+    (_comparator)
+  {
+  }
+  
+  	/** constructor without comparator */
+	moeoElitistReplacement (moeoFitnessAssignment < MOEOT > &_evalFitness, moeoDiversityAssignment < MOEOT > &_evalDiversity)
+		:evalFitness (_evalFitness), evalDiversity (_evalDiversity)
+	    
+	  {
+	  	 // a moeoFitThenDivComparator is used as default
+	    moeoFitnessThenDiversityComparator < MOEOT > &fitThenDivComparator;
+	    comparator = fitThenDivComparator;
+	  }
+
+
+     /** Constructor without moeoDiversityAssignement  */
+moeoElitistReplacement (moeoFitnessAssignment < MOEOT > &_evalFitness, moeoComparator < MOEOT > _comparator):evalFitness (_evalFitness),
+    comparator
+    (_comparator)
+  {
+    // a dummy diversity is used as default
+    moeoDummyDiversityAssignment < MOEOT > &dummyDiversityAssignment;
+    evalDiversity = dummyDiversityAssignment;
+  }
+
+
+     /** Constructor without moeoDiversityAssignement nor moeoComparator */
+moeoElitistReplacement (moeoFitnessAssignment < MOEOT > &_evalFitness):evalFitness
+    (_evalFitness)
+  {
+    // a dummy diversity is used as default
+    moeoDummyDiversityAssignment < MOEOT > &dummyDiversityAssignment;
+    evalDiversity = dummyDiversityAssignment;
+
+    // a moeoFitThenDivComparator is used as default
+    moeoFitnessThenDiversityComparator < MOEOT > &fitThenDivComparator;
+    comparator = fitThenDivComparator;
+  }
+
+
+     /**
+      * Replace the first population by adding the individuals of the second one, sorting with a moeoComparator and resizing the whole population obtained.
+      * @param _parents the population composed of the parents (the population you want to replace)
+      * @param _offspring
+      */
+  void operator () (eoPop < MOEOT > &_parents, eoPop < MOEOT > &_offspring)
+  {
+    unsigned sz = _parents.size ();
+
+    // merge offspring and parents into a global population ...
+    _parents.reserve (_parents.size () + _offspring.size ());
+    copy (_offspring.begin (), _offspring.end (), back_inserter (_parents));
+
+    // evaluate the fitness and the diversity of this global population
+    evalFitness (_parents);
+    evalDiversity (_parents);
+
+    // ... that we sort according to the comparator
+    std::sort (_parents.begin (), _parents.end (), comparator);
+
+    // finally, resize this global population
+    _parents.resize (sz);
+
+    _offspring.clear ();
+  }
+
+protected:
+
+  moeoFitnessAssignment < MOEOT > &evalFitness;
+
+  moeoDiversityAssignment < MOEOT > &evalDiversity;
+
+  moeoComparator < MOEOT > &comparator;
+};
+
+
+
+#endif /*MOEOELITISTREPLACEMENT_H_ */