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

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

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "FlowShopInit.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 _FlowShopInit_h
+#define _FlowShopInit_h
+
+#include <eoInit.h>
+
+
+/**
+ * Functor
+ * Initialisation of a random genotype built by the default constructor of the eoFlowShop class
+ */
+class FlowShopInit:public eoInit < FlowShop >
+{
+
+public:
+
+  /** 
+   * constructor
+   * @param const unsigned _N  the number of jobs to schedule
+   */
+  FlowShopInit (const unsigned _N)
+  {
+    N = _N;
+  }
+
+  /**
+   * randomize a genotype
+   * @param FlowShop & _genotype  a genotype that has been default-constructed
+   */
+  void operator  () (FlowShop & _genotype)
+  {
+    // scheduling vector
+    vector < unsigned >scheduling (N);
+    // initialisation of possible values
+    vector < unsigned >possibles (N);
+    for (unsigned i = 0; i < N; i++)
+      possibles[i] = i;
+    // random initialization
+    unsigned rInd;		// random index
+    for (unsigned i = 0; i < N; i++)
+      {
+	rInd = (unsigned) rng.uniform (N - i);
+	scheduling[i] = possibles[rInd];
+	possibles[rInd] = possibles[N - i - 1];
+      }
+    _genotype.setScheduling (scheduling);
+    _genotype.invalidate ();	// IMPORTANT in case the _genotype is old
+  }
+
+
+private:
+  /** the number of jobs (size of a scheduling vector) */
+  unsigned N;
+
+};
+
+#endif