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package org.apache.juneau.utils;

import java.util.function.*;

/**
 * Allows you to perform a function against 4 objects.
 *
 * <p>
 * Similar to {@link BiFunction} except for 4 parameters.
 *
 * <p class='bjava'>
 * 	Tuple4Function&lt;A,B,C,D,R&gt; <jv>x</jv> = (<jv>a</jv>,<jv>b</jv>,<jv>c</jv>,<jv>d</jv>) -&gt; <jsm>doSomething</jsm>(<jv>a</jv>,<jv>b</jv>,<jv>c</jv>,<jv>d</jv>);
 *
 * 	R <jv>result</jv> = <jv>x</jv>.apply(<jv>xa</jv>,<jv>xb</jv>,<jv>xc</jv>,<jv>xd</jv>);
 * </p>
 *
 * <ul class='seealso'>
 * 	<li class='extlink'>{@source}
 * </ul>
 *
 * @param <A> Object 1 type.
 * @param <B> Object 2 type.
 * @param <C> Object 3 type.
 * @param <D> Object 4 type.
 * @param <R> Result type.
 */
@FunctionalInterface
public interface Tuple4Function<A,B,C,D,R> {

	@SuppressWarnings("javadoc")
	R apply(A a, B b, C c, D d);

	@SuppressWarnings("javadoc")
	default <V> Tuple4Function<A,B,C,D,V> andThen(Function<? super R, ? extends V> after) {
		return (A a, B b, C c, D d) -> after.apply(apply(a, b, c, d));
	}
}
