/*
 * Copyright (C) 2021 Daniel Dietsch (dietsch@informatik.uni-freiburg.de)
 * Copyright (C) 2021 University of Freiburg
 *
 * This file is part of the ULTIMATE Util Library.
 *
 * The ULTIMATE Util Library 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 ULTIMATE Util Library 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 ULTIMATE Util Library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Additional permission under GNU GPL version 3 section 7:
 * If you modify the ULTIMATE Util Library, or any covered work, by linking
 * or combining it with Eclipse RCP (or a modified version of Eclipse RCP),
 * containing parts covered by the terms of the Eclipse Public License, the
 * licensors of the ULTIMATE Util Library grant you additional permission
 * to convey the resulting work.
 */
package de.uni_freiburg.informatik.ultimate.util;

import java.util.Objects;
import java.util.function.IntSupplier;

/**
 * Similar to {@link Lazy}, but for the primitive type int.
 *
 * @author Daniel Dietsch (dietsch@informatik.uni-freiburg.de)
 *
 */
public class LazyInt {
	private int mValue;
	private IntSupplier mFun;

	public LazyInt(final IntSupplier valueConstruction) {
		mFun = Objects.requireNonNull(valueConstruction);
	}

	/**
	 * Get or construct the cached value.
	 */
	public int get() {
		if (mFun == null) {
			return mValue;
		}
		mValue = mFun.getAsInt();
		mFun = null;
		return mValue;
	}
}