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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package co.elastic.clients.util;

/**
 * Represents a function that accepts 4 arguments and produces a result.
 * This is the 4-arity specialization of {@link java.util.function.Function}.
 *
 * @param  the type of the first argument to the function
 * @param  the type of the second argument to the function
 * @param  the type of the third argument to the function
 * @param  the type of the fourth argument to the function
 * @param  the type of the result of the function
 *
 * @see java.util.function.Function
 * @see java.util.function.BiFunction
 */
@FunctionalInterface
public interface QuadFunction {

    /**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @param v the third function argument
     * @param w the fourth function argument
     * @return the function result
     */
    R apply(T t, U u, V v, W w);
}