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# two_opt_incr_eval.cpp

    00001 // "TwoOptIncrEval.cpp"
    00002
    00003 // (c) OPAC Team, LIFL, January 2006
    00004
    00005 /*
    00006    Contact: paradiseo-help@lists.gforge.inria.fr
    00007 */
    00008
    00009 #include "two_opt_incr_eval.h"
    00010 #include "node.h"
    00011
    00012 int TwoOptIncrEval :: operator () (const TwoOpt & __move, const Route & __route) {
    00013
    00014   /* From */
    00015   Node v1 = __route [__move.first], v1_left = __route [(__move.first - 1 + numNodes) % numNodes];
    00016
    00017   /* To */
    00018   Node v2 = __route [__move.second], v2_right = __route [(__move.second + 1) % numNodes];
    00019
    00020   if (v1 == v2 || v2_right == v1)
    00021     return __route.fitness ();
    00022   else
    00023     return __route.fitness () - distance (v1_left, v2) - distance (v1, v2_right) + distance (v1_left, v1) + distance (v2, v2_right);
    00024 }