LongFunction.java

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package java.util.function;

/**
 * Represents a function that accepts a long-valued argument and produces a
 * result.  This is the {@code long}-consuming primitive specialization for
 * {@link Function}.
 *
 * <p>This is a <a href="package-summary.html">functional interface</a>
 * whose functional method is {@link #apply(long)}.
 *
 * @param <R> the type of the result of the function
 *
 * @see Function
 * @since 1.8
 */
@FunctionalInterface
public interface LongFunction<R> {

    /**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    R apply(long value);
}