openjdk/jdk/src/share/classes/java/util/function/ToLongBiFunction.java

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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package java.util.function;

/**
 * Apply a function to the input arguments, yielding an appropriate result.
 * This is the {@code long}-bearing specialization for {@link BiFunction}.
 *
 * @param <T> the type of the first argument to the {@code applyAsLong}
 * operation.
 * @param <U> the type of the second argument to the {@code applyAsLong}
 * operation.
 *
 * @see BiFunction
 * @since 1.8
 */
@FunctionalInterface
public interface ToLongBiFunction<T, U> {

    /**
     * Compute the result of applying the function to the input arguments.
     *
     * @param t an input object
     * @param u an input object
     * @return the function result value
     */
    long applyAsLong(T t, U u);
}