[fpc-pascal]Polymorphism of class field

[Kuba Ober]

> I probably should have looked up the definition of TObject in the docs
> before I started, but now that I have done so, I'm still confused.  To
> destroy an instance of a class, I should call its destructor (which I've
> changed to Destoy, as you said I should).  Thus the following should work
> *and is the proper way of doing this*:

The destructor does only what you write in it. If your class is allocated on 
the heap, you must actually free the heap. That's what free() is for. free() 
calls the destructor and then frees the heap, more or less like that
	free(objptr); 
equals 
	if objptr != nil then begin
		objptr.Destroy;
		freemem(objptr);
		objptr = nuil; { NO, I DON'T KNOW IF THIS LINE IS ACTUALLY DONE! }
	end;

I hope I didn't mess up things ;-)

Cheerz,
Kuba