c496c12f40
git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@386 331e1502-861f-0410-8da2-ba01fb791d7f
120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// FlowShopOpCrossoverQuad.h
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// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
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/*
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This library...
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Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef FLOWSHOPOPCROSSOVERQUAD_H_
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#define FLOWSHOPOPCROSSOVERQUAD_H_
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#include <eoOp.h>
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#include "FlowShop.h"
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/**
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* Functor
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* Quadratic crossover operator for flow-shop (modify the both genotypes)
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*/
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class FlowShopOpCrossoverQuad: public eoQuadOp<FlowShop> {
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public:
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/**
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* default constructor
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*/
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FlowShopOpCrossoverQuad() {}
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/**
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* the class name (used to display statistics)
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*/
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string className() const {
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return "FlowShopOpCrossoverQuad";
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}
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/**
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* eoQuad crossover - _genotype1 and _genotype2 are the (future) offspring, i.e. _copies_ of the parents
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* @param FlowShop & _genotype1 the first parent
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* @param FlowShop & _genotype2 the second parent
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*/
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bool operator()(FlowShop & _genotype1, FlowShop & _genotype2) {
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bool oneAtLeastIsModified;
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// parents
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vector<unsigned> parent1 = _genotype1.getScheduling();
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vector<unsigned> parent2 = _genotype2.getScheduling();
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// computation of the 2 random points
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unsigned point1, point2;
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do {
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point1 = rng.random(min(parent1.size(), parent2.size()));
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point2 = rng.random(min(parent1.size(), parent2.size()));
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} while (fabs((double) point1-point2) <= 2);
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// computation of the offspring
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vector<unsigned> offspring1 = generateOffspring(parent1, parent2, point1, point2);
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vector<unsigned> offspring2 = generateOffspring(parent2, parent1, point1, point2);
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// does at least one genotype has been modified ?
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if ((parent1 != offspring1) || (parent2 != offspring2)) {
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// update
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_genotype1.setScheduling(offspring1);
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_genotype2.setScheduling(offspring2);
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// at least one genotype has been modified
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oneAtLeastIsModified = true;
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}
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else {
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// no genotype has been modified
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oneAtLeastIsModified = false;
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}
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// return 'true' if at least one genotype has been modified
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return oneAtLeastIsModified;
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}
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private:
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/**
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* generation of an offspring by a 2 points crossover
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* @param vector<unsigned> _parent1 the first parent
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* @param vector<unsigned> _parent2 the second parent
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* @param unsigned_point1 the first point
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* @param unsigned_point2 the second point
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*/
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vector<unsigned> generateOffspring(vector<unsigned> _parent1, vector<unsigned> _parent2, unsigned _point1, unsigned _point2) {
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vector<unsigned> result = _parent1;
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vector<bool> taken_values(result.size(), false);
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if (_point1 > _point2) swap(_point1, _point2);
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/* first parent */
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for (unsigned i=0 ; i<=_point1 ; i++) {
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// result[i] == _parent1[i]
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taken_values[_parent1[i]] = true;
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}
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for (unsigned i=_point2 ; i<result.size() ; i++) {
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// result[i] == _parent1[i]
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taken_values[_parent1[i]] = true;
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}
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/* second parent */
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unsigned i = _point1+1;
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unsigned j = 0;
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while (i<_point2 && j<_parent2.size()) {
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if (! taken_values[_parent2[j]]) {
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result[i] = _parent2[j];
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i++;
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}
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j++;
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}
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return result;
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}
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};
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#endif /*FLOWSHOPOPCROSSOVERQUAD_H_*/
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