two_opt_incr_eval.cpp

00001 /* 
00002 * <two_opt_incr_eval.cpp>
00003 * Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
00004 * (C) OPAC Team, LIFL, 2002-2007
00005 *
00006 * Sebastien Cahon, Alexandru-Adrian Tantar
00007 *
00008 * This software is governed by the CeCILL license under French law and
00009 * abiding by the rules of distribution of free software.  You can  use,
00010 * modify and/ or redistribute the software under the terms of the CeCILL
00011 * license as circulated by CEA, CNRS and INRIA at the following URL
00012 * "http://www.cecill.info".
00013 *
00014 * As a counterpart to the access to the source code and  rights to copy,
00015 * modify and redistribute granted by the license, users are provided only
00016 * with a limited warranty  and the software's author,  the holder of the
00017 * economic rights,  and the successive licensors  have only  limited liability.
00018 *
00019 * In this respect, the user's attention is drawn to the risks associated
00020 * with loading,  using,  modifying and/or developing or reproducing the
00021 * software by the user in light of its specific status of free software,
00022 * that may mean  that it is complicated to manipulate,  and  that  also
00023 * therefore means  that it is reserved for developers  and  experienced
00024 * professionals having in-depth computer knowledge. Users are therefore
00025 * encouraged to load and test the software's suitability as regards their
00026 * requirements in conditions enabling the security of their systems and/or
00027 * data to be ensured and,  more generally, to use and operate it in the
00028 * same conditions as regards security.
00029 * The fact that you are presently reading this means that you have had
00030 * knowledge of the CeCILL license and that you accept its terms.
00031 *
00032 * ParadisEO WebSite : http://paradiseo.gforge.inria.fr
00033 * Contact: paradiseo-help@lists.gforge.inria.fr
00034 *
00035 */
00036 
00037 #include "two_opt_incr_eval.h"
00038 #include "node.h"
00039 
00040 int TwoOptIncrEval :: operator () (const TwoOpt & __move, const Route & __route) {
00041   
00042   /* From */
00043   Node v1 = __route [__move.first], v1_left = __route [(__move.first - 1 + numNodes) % numNodes];
00044   
00045   /* To */
00046   Node v2 = __route [__move.second], v2_right = __route [(__move.second + 1) % numNodes];
00047  
00048   if (v1 == v2 || v2_right == v1)
00049     return __route.fitness ();
00050   else 
00051     return __route.fitness () - distance (v1_left, v2) - distance (v1, v2_right) + distance (v1_left, v1) + distance (v2, v2_right);
00052 }

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