code: /*
   * 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.rxjava3.functions;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  
  /**
   * A functional interface (callback) that computes a value based on multiple input values.
   * @param <T1> the first value type
   * @param <T2> the second value type
   * @param <T3> the third value type
   * @param <R> the result type
   */
  @FunctionalInterface
  public interface Function3<@NonNull T1, @NonNull T2, @NonNull T3, @NonNull R> {
      /**
       * Calculate a value based on the input values.
       * @param t1 the first value
       * @param t2 the second value
       * @param t3 the third value
       * @return the result value
       * @throws Throwable if the implementation wishes to throw any type of exception
       */
      R apply(T1 t1, T2 t2, T3 t3) throws Throwable;
  }
  