using System;

​

namespace Example

{

    public interface ITileMap<out T> where T : Tile

    {

    }

    public class Tile

    {

        public ITileMap<Tile> tileMap { get; set; }

    }

    public class TileMap<T> : ITileMap<T> where T : Tile, new()

    {

        public TileMap()

        {

            T newTile = new T();

            newTile.tileMap = this; 

        }

        public override string ToString()

        {

            return "Hello world!!!";

        }

    }

    public class Program

    {

        public static void Main()

        {

            var t = new TileMap<Tile>();

            Console.WriteLine(t);

        }

    }

}