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A fluent interface for state machines

There is a newer version: 2.5.0

package com.github.oxo42.stateless4j.delegates;

/**
 * Represents a function that accepts an input and produces a result
 *
 * @param  Input argument type
 * @param   Result type
 */
public interface Func2 {
    /**
     * Applies this function to the given input
     *
     * @param arg1 Input argument
     * @return Result
     */
    R call(T1 arg1);
}