using System;

​

public interface ITrait

{

    void Encode();

}

​

public interface ITrait<T> : ITrait

{

    T Value { get; }

}

​

public interface IShape

{

    void Render();

    void Scale(int factor);

}

​

public interface IContainer

{

    void AddChild(IShape shape);

}

​

public class Circle : IShape, ITrait<IShape>, IContainer, ITrait<IContainer>

{

    IShape ITrait<IShape>.Value => this;

    IContainer ITrait<IContainer>.Value => this;

​

    public int Radius {get;set;}

    public Circle(int radius) => Radius = radius;

​

    public void Render()

    {

        Console.WriteLine($"Render Circle radius: {Radius}");

    }

    public void Scale(int factor)

    {

        Radius *= factor;

    }

    public void AddChild(IShape shape)

    {

    }

    public void Encode()

    {

        Console.WriteLine("Encode Circle");

    }

}

​

public class ShapeManager

{

    public static ITrait<IShape> Render(ITrait<IShape> shape)

    {

        shape.Value.Render();

        return shape;

    }

}

​

​

public class Program

{

    public static void Main()

    {

        var circle = new Circle(2);

        var shape = ShapeManager.Render(circle);

        shape.Value.Scale(2);

        shape = ShapeManager.Render(circle);

    }

}