/* Copyright 2009-2015 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/>.
*/
/**
* Classes for representing, building and evaluating expression trees for use
* in 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.util.tree;