Delegates and classes for custom code.

[Chris Katko]

I'm having trouble conceptualizing this issue at the moment. But 
it seems if I pass to the delegate my object, then I can ONLY use 
one class type.

Say, the delegate takes a "this" from... some class that wants to 
have a dialog. A window. Now the delegate NEEDS a this from a 
window, and only a window. So if I have a delegate in... 
something else, I'll either need to figure out some way for 
templates to work with that... or some kind of wrapping class / 
interface.

But all I want is a kind of Javascript'y:

Every time this object gets .onDraw() called. It does whatever I 
told it to do.

auto t = new object1( onDraw(){ do stuff} );
auto t2 = new object2( onDraw() { do other stuff} );

I'm trying to do the same kind of API for button handling where 
it automatically links into event queues (which works) and the 
button does whatever I want it to. But, it can only access PUBLIC 
INTERFACES (globals) because it can't access the underlying 
object and globals are the only ones it can statically figure out 
at compile-time.