using System;

​

class Program

{

    static int Check(Operators @operator) =>

        @operator.IsSome()

            ? 1

            : 0;

​

    static void Main(string[] args)

    {

        Console.WriteLine($"Check(Operators.None) {Check(Operators.None)}");

        Console.WriteLine($"Check() {Check(Operators.GreaterOrEqual)}");

        // Console.WriteLine($"Check() {Check(null)}"); // error CS1502: The best overloaded method match for `Program.Check(Operators)' has some invalid arguments

    }

}

​

public enum Operators

{

    None,

    Equal,

    NotEqual,

    Greater,

    GreaterOrEqual,

    Lesser,

    LesserOrEqual

}

​

public static class It

{

    public static bool IsSome<T>(this T @object) =>

        @object != null;

}