git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@36 331e1502-861f-0410-8da2-ba01fb791d7f

trunk/paradiseo-moeo/tutorials/lesson1/FlowShopOpMutationExchange.h

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "FlowShopOpMutationExchange.h"
+
+// (c) OPAC Team, LIFL, March 2006
+
+/* This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+   
+   Contact: Arnaud.Liefooghe@lifl.fr
+*/
+
+#ifndef _FlowShopOpMutationExchange_h
+#define _FlowShopOpMutationExchange_h
+
+#include <eoOp.h>
+
+
+/**
+ * Functor
+ * Exchange mutation operator for flow-shop
+ */
+class FlowShopOpMutationExchange:public eoMonOp < FlowShop >
+{
+
+public:
+
+  /**
+   * default constructor
+   */
+  FlowShopOpMutationExchange ()
+  {
+  }
+
+  /**
+   * the class name (used to display statistics)
+   */
+  string className () const
+  {
+    return "FlowShopOpMutationExchange";
+  }
+
+  /**
+   * modifies the parent with an exchange mutation
+   * @param FlowShop & _genotype  the parent genotype (will be modified)
+   */
+  bool operator  () (FlowShop & _genotype)
+  {
+    bool isModified;
+
+    // schedulings
+    vector < unsigned >initScheduling = _genotype.getScheduling ();
+    vector < unsigned >resultScheduling = _genotype.getScheduling ();
+
+    // computation of the 2 random points
+    unsigned point1, point2;
+    do
+      {
+	point1 = rng.random (resultScheduling.size ());
+	point2 = rng.random (resultScheduling.size ());
+      }
+    while (point1 == point2);
+
+    // swap
+    swap (resultScheduling[point1], resultScheduling[point2]);
+
+    // update (if necessary)
+    if (resultScheduling != initScheduling)
+      {
+	// update
+	_genotype.setScheduling (resultScheduling);
+	// the genotype has been modified
+	isModified = true;
+      }
+    else
+      {
+	// the genotype has not been modified
+	isModified = false;
+      }
+
+    // return 'true' if the genotype has been modified
+    return isModified;
+  }
+
+};
+
+#endif