ToLongFunction.java

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package java.util.function;

/**
 * Apply a function to the input argument, yielding an appropriate result.
 * This is the {@code long}-bearing specialization for {@link Function}.
 *
 * @param <T> the type of input objects to the function
 *
 * @see Function
 * @since 1.8
 */
@FunctionalInterface
public interface ToLongFunction<T> {

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