git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@130 331e1502-861f-0410-8da2-ba01fb791d7f

trunk/paradiseo-peo/examples/shared/two_opt_incr_eval.cpp

@@ -0,0 +1,39 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "TwoOptIncrEval.cpp"
+
+// (c) OPAC Team, LIFL, January 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: paradiseo-help@lists.gforge.inria.fr
+*/
+
+#include "two_opt_incr_eval.h"
+#include "node.h"
+
+int TwoOptIncrEval :: operator () (const TwoOpt & __move, const Route & __route) {
+  
+  /* From */
+  Node v1 = __route [__move.first], v1_left = __route [(__move.first - 1 + numNodes) % numNodes];
+  
+  /* To */
+  Node v2 = __route [__move.second], v2_right = __route [(__move.second + 1) % numNodes];
+ 
+  if (v1 == v2 || v2_right == v1)
+    return __route.fitness ();
+  else 
+    return __route.fitness () - distance (v1_left, v2) - distance (v1, v2_right) + distance (v1_left, v1) + distance (v2, v2_right);
+}