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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.commons.lang3.function;

import java.util.function.BiFunction;

/**
 * A function that accepts two arguments and produces a boolean result. This is the {@code boolean}-producing primitive
 * specialization for {@link BiFunction}.
 *
 * @param  the type of the first argument to the function.
 * @param  the type of the second argument to the function.
 *
 * @see BiFunction
 * @since 3.12.0
 */
@FunctionalInterface
public interface ToBooleanBiFunction {

    /**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument.
     * @param u the second function argument.
     * @return the function result.
     */
    boolean applyAsBoolean(T t, U u);
}