001    package net.sf.cpsolver.ifs.model;
002    
003    /**
004     * IFS neighbour.
005     * 
006     * @see net.sf.cpsolver.ifs.heuristics.NeighbourSelection
007     * 
008     * @version IFS 1.2 (Iterative Forward Search)<br>
009     *          Copyright (C) 2006 - 2010 Tomas Muller<br>
010     *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
011     *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
012     * <br>
013     *          This library is free software; you can redistribute it and/or modify
014     *          it under the terms of the GNU Lesser General Public License as
015     *          published by the Free Software Foundation; either version 3 of the
016     *          License, or (at your option) any later version. <br>
017     * <br>
018     *          This library is distributed in the hope that it will be useful, but
019     *          WITHOUT ANY WARRANTY; without even the implied warranty of
020     *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
021     *          Lesser General Public License for more details. <br>
022     * <br>
023     *          You should have received a copy of the GNU Lesser General Public
024     *          License along with this library; if not see
025     *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
026     */
027    
028    public abstract class Neighbour<V extends Variable<V, T>, T extends Value<V, T>> {
029        /** Perform assignmnet */
030        public abstract void assign(long iteration);
031    
032        /** Difference in the evaluation function, if this neighnour is assigned. */
033        public abstract double value();
034    }