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Provides functional interfaces for all no-argument functions

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package net.mintern.functions.nullary.checked;

/**
 * An operation of type {@code () -> boolean}.
 *
 * @param  the {@code Exception} type that the operation may throw
 */
@FunctionalInterface
public interface NilToBoolE {

    /**
     * Performs this operation.
     *
     * @return the result of the operation
     * @throws E if the operation cannot be completed
     */
    boolean call() throws E;
}