/* Copyright 2009-2013 David Hadka
 *
 * This file is part of the MOEA Framework.
 *
 * The MOEA Framework is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * The MOEA Framework is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the MOEA Framework.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Collection of operators for expression trees for use with Genetic
 * Programming (GP).
 * <p>
 * References:
 * <ol>
 *   <li>Poli, R., Langdon, W.B., McPhee, N.F., Koza, J.R.  "A Field Guide to
 *       Genetic Programming."  Available online at {@literal
 *       <http://www.gp-field-guide.org.uk>}, 26 March 2008.
 *   <li>Koza, J.R.  "Genetic Programming: On the Programming of Computers by
 *       Means of Natural Selection."  MIT Press, Cambridge, MA, USA, 1992.
 * </ol>
 */
package org.moeaframework.core.operator.program;