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streamsupport is a backport of the Java 8 java.util.function (functional interfaces) and java.util.stream (streams) API for Java 6 / 7 and Android developers

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package java8.util.function;

import java8.util.function.BiFunction;

/**
 * Represents a function that accepts two arguments and produces a long-valued
 * result.  This is the {@code long}-producing primitive specialization for
 * {@link BiFunction}.
 *
 * This is a functional interface
 * whose functional method is {@link #applyAsLong(Object, Object)}.
 *
 * @param  the type of the first argument to the function
 * @param  the type of the second argument to the function
 *
 * @see BiFunction
 * @since 1.8
 */
public interface ToLongBiFunction {

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