Storing a reference to the calling object

[Tim]

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!