MO full import

git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@25 331e1502-861f-0410-8da2-ba01fb791d7f

trunk/paradiseo-mo/src/moBestImprSelect.h

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "moBestImprSelect.h"
+
+// (c) OPAC Team, LIFL, 2003-2006
+
+/* LICENCE TEXT
+   
+   Contact: paradiseo-help@lists.gforge.inria.fr
+*/
+
+#ifndef __moBestImprSelect_h
+#define __moBestImprSelect_h
+
+#include "moMoveSelect.h"
+
+//! One of the possible moMoveSelect.
+/*!
+  All neighbors are considered, and the movement
+  which enables the best improvement is selected.
+*/
+template < class M > class moBestImprSelect:public moMoveSelect < M >
+{
+
+public:
+
+  //! Alias for the fitness.
+  typedef typename M::EOType::Fitness Fitness;
+
+  //! Procedure which initialise the exploration
+  void init (const Fitness & __fit)
+  {
+
+    first_time = true;
+  }
+
+
+  //!Function that indicates if the current move has not improved the fitness.
+  /*!
+     If the given fitness enables an improvment,
+     the move (moMove) and the fitness linked to this move are saved.
+
+     \param __move a move.
+     \param __fit a fitness linked to the move.
+     \return TRUE if the move does not improve the fitness.
+   */
+  bool update (const M & __move, const Fitness & __fit)
+  {
+
+    if (first_time || __fit > best_fit)
+      {
+
+	best_fit = __fit;
+	best_move = __move;
+
+	first_time = false;
+      }
+
+    return true;
+  }
+
+  //! Procedure which saved the best move and fitness.
+  /*!
+     \param __move the current move (result of the procedure).
+     \param __fit the current fitness (result of the procedure).
+     \throws EmptySelection if no move has improved the fitness.
+   */
+  void operator   () (M & __move, Fitness & __fit) throw (EmptySelection)
+  {
+
+    if (!first_time)
+      {
+	__move = best_move;
+	__fit = best_fit;
+      }
+    else
+      throw EmptySelection ();
+  }
+
+private:
+
+  //! Allowing to know if at least one move has been generated. 
+  bool first_time;
+
+  //! The best move.
+  M best_move;
+
+  //! The best fitness.
+  Fitness best_fit;
+
+};
+
+#endif