001    package net.sf.cpsolver.ifs.model;
002    
003    /**
004     * IFS neighbour.
005     *
006     * @see net.sf.cpsolver.ifs.heuristics.NeighbourSelection
007     *
008     * @version
009     * IFS 1.1 (Iterative Forward Search)<br>
010     * Copyright (C) 2006 Tomáš Müller<br>
011     * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
012     * Lazenska 391, 76314 Zlin, Czech Republic<br>
013     * <br>
014     * This library is free software; you can redistribute it and/or
015     * modify it under the terms of the GNU Lesser General Public
016     * License as published by the Free Software Foundation; either
017     * version 2.1 of the License, or (at your option) any later version.
018     * <br><br>
019     * This library is distributed in the hope that it will be useful,
020     * but WITHOUT ANY WARRANTY; without even the implied warranty of
021     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
022     * Lesser General Public License for more details.
023     * <br><br>
024     * You should have received a copy of the GNU Lesser General Public
025     * License along with this library; if not, write to the Free Software
026     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
027     */
028    
029    public abstract class Neighbour {
030            /** Perform assignmnet */
031            public abstract void assign(long iteration);
032            /** Difference in the evaluation function, if this neighnour is assigned. */
033            public abstract double value();
034    }