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/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed 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 io.reactivex.functions;

import io.reactivex.annotations.NonNull;

/**
 * A functional interface (callback) that computes a value based on multiple input values.
 * @param  the first value type
 * @param  the second value type
 * @param  the third value type
 * @param  the fourth value type
 * @param  the result type
 */
public interface Function4 {
    /**
     * Calculate a value based on the input values.
     * @param t1 the first value
     * @param t2 the second value
     * @param t3 the third value
     * @param t4 the fourth value
     * @return the result value
     * @throws Exception on error
     */
    @NonNull
    R apply(@NonNull T1 t1, @NonNull T2 t2, @NonNull T3 t3, @NonNull T4 t4) throws Exception;
}