Storing a reference to the calling object

[Tim via Digitalmars-d-learn]

Hi all, I'm a little new to D and I'm wondering how I can store a 
reference to the calling object. I want to create a reference to 
an object's parent so that each time I go to update the sprite, 
it is able to grab its position from the parent.

So if I have:
class Sprite{
    /// Postional components of the sprite
    int* x, y;
    SDL_Surface* image_surface;
    auto parent;

    this(const char* path, auto parent){
        writeln(*x);
        this.parent = parent;
    }

    void update(){
        // Copy loaded image to window surface
        writeln("Sprites x: ",  *x);
        SDL_Rect dstRect;
        dstRect.x = parent.x;
        dstRect.y = parent.y;
        SDL_BlitSurface(image_surface, null, g_surface, &dstRect);
    }
}

And call it like so:

sprite = new Sprite(path, this);

How can I make this sort of thing work? Thanks a lot in advance 
for the help!