using System;

​

public interface IBird

{

    Egg Lay();

}

​

public class Chicken : IBird

{

    public Chicken()

    {

    }

    public Egg Lay()

    {

        return new Egg(() => new Chicken());

    }

}

​

public class Egg

{

    IBird bird;

    public Egg(Func<IBird> createBird)

    {

        bird = createBird.Invoke();

    }

​

    public IBird Hatch()

    {

        return bird;

    }

}   

​

​

​

​

public class Program

{

    public static void Main()

    {

        var chicken1 = new Chicken();

        Console.WriteLine("chicken1 is {0}", chicken1.GetType().Name);

        var egg = chicken1.Lay();

        var childChicken = egg.Hatch();

        Console.WriteLine("childChicken is {0}", childChicken.GetType().Name);

    }

}