using System;

​

namespace ConsoleApplication1

{

​

    public struct Optional<T>

    {

        internal T val;

        private bool hasBeenSet;

        public Optional(T value){

            val=value;

            hasBeenSet= true;

        }

        public bool HasBeenSet {get {return hasBeenSet;}}

        public override bool Equals(object obj) 

        {       

            return obj.Equals(val);

        }

        public override int GetHashCode() 

        {       

            return val.GetHashCode();

        }

        static public implicit operator T(Optional<T> optional){

            return optional.val;

        }

        static public implicit operator Optional<T>(T optional){

            return new Optional<T>(optional);

        }

    }

    public class POCO{

        public Optional<string> name1;

        public Optional<string> name2;

        public Optional<POCO> moo;

        public Optional<int> number;

        public Optional<int?> numberMoo;

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            var poco = new POCO();

            poco.name1="hello";

            Console.WriteLine(poco.name1.HasBeenSet);

            Console.WriteLine(poco.name1);

            Console.WriteLine(poco.name2.HasBeenSet);

            Console.WriteLine(poco.name2);

            Console.WriteLine(poco.moo.HasBeenSet);

            poco.moo = new POCO();

            Console.WriteLine(poco.moo.HasBeenSet);

            poco.number = 5;

            Console.WriteLine(poco.number.HasBeenSet);

            poco.numberMoo= null;

            Console.WriteLine(poco.numberMoo.HasBeenSet);

​

        }

    }

}