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# FlowShopOpCrossoverQuad.cpp

    00001 // -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
    00002
    00003 //-----------------------------------------------------------------------------
    00004 // FlowShopOpCrossoverQuad.cpp
    00005 // (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
    00006 /*
    00007     This library...
    00008
    00009     Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
    00010  */
    00011 //-----------------------------------------------------------------------------
    00012
    00013 #include <FlowShopOpCrossoverQuad.h>
    00014
    00015
    00016 std::string FlowShopOpCrossoverQuad::className() const
    00017 {
    00018     return "FlowShopOpCrossoverQuad";
    00019 }
    00020
    00021
    00022 bool FlowShopOpCrossoverQuad::operator()(FlowShop & _flowshop1, FlowShop & _flowshop2)
    00023 {
    00024     bool oneAtLeastIsModified;
    00025     // computation of the 2 random points
    00026     unsigned int point1, point2;
    00027     do
    00028     {
    00029         point1 =  rng.random(std::min(_flowshop1.size(), _flowshop2.size()));
    00030         point2 =  rng.random(std::min(_flowshop1.size(), _flowshop2.size()));
    00031     } while (fabs((double) point1-point2) <= 2);
    00032     // computation of the offspring
    00033     FlowShop offspring1 = generateOffspring(_flowshop1, _flowshop2, point1, point2);
    00034     FlowShop offspring2 = generateOffspring(_flowshop2, _flowshop1, point1, point2);
    00035     // does at least one genotype has been modified ?
    00036     if ((_flowshop1 != offspring1) || (_flowshop2 != offspring2))
    00037     {
    00038         // update
    00039         _flowshop1.value(offspring1);
    00040         _flowshop2.value(offspring2);
    00041         // at least one genotype has been modified
    00042         oneAtLeastIsModified = true;
    00043     }
    00044     else
    00045     {
    00046         // no genotype has been modified
    00047         oneAtLeastIsModified = false;
    00048     }
    00049     // return 'true' if at least one genotype has been modified
    00050     return oneAtLeastIsModified;
    00051 }
    00052
    00053
    00054 FlowShop FlowShopOpCrossoverQuad::generateOffspring(const FlowShop & _parent1, const FlowShop & _parent2, unsigned int _point1, unsigned int _point2)
    00055 {
    00056     FlowShop result = _parent1;
    00057     std::vector<bool> taken_values(result.size(), false);
    00058     if (_point1 > _point2)
    00059         std::swap(_point1, _point2);
    00060     /* first parent */
    00061     for (unsigned int i=0 ; i<=_point1 ; i++)
    00062     {
    00063         // result[i] == _parent1[i]
    00064         taken_values[_parent1[i]] = true;
    00065     }
    00066     for (unsigned int i=_point2 ; i<result.size() ; i++)
    00067     {
    00068         // result[i] == _parent1[i]
    00069         taken_values[_parent1[i]] = true;
    00070     }
    00071     /* second parent */
    00072     unsigned int i = _point1+1;
    00073     unsigned int j = 0;
    00074     while (i<_point2 && j<_parent2.size())
    00075     {
    00076         if (! taken_values[_parent2[j]])
    00077         {
    00078             result[i] = _parent2[j];
    00079             i++;
    00080         }
    00081         j++;
    00082     }
    00083     return result;
    00084 }