001 package net.sf.cpsolver.ifs.constant;
002
003 /**
004 * Extension of a variable with the possibility to have a constant value.
005 *
006 * Such variables are excluded from the solver process, however, they can be
007 * included in constraints.
008 *
009 * @version IFS 1.2 (Iterative Forward Search)<br>
010 * Copyright (C) 2006 - 2010 Tomas Muller<br>
011 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
012 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
013 * <br>
014 * This library is free software; you can redistribute it and/or modify
015 * it under the terms of the GNU Lesser General Public License as
016 * published by the Free Software Foundation; either version 3 of the
017 * License, or (at your option) any later version. <br>
018 * <br>
019 * This library is distributed in the hope that it will be useful, but
020 * 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. <br>
023 * <br>
024 * You should have received a copy of the GNU Lesser General Public
025 * License along with this library; if not see <http://www.gnu.org/licenses/>.
026 *
027 */
028
029 public interface ConstantVariable {
030 /** True, if the variable is constant. */
031 public boolean isConstant();
032 }