Thanks for your help, much appreciated.I'm using the delegates now for the callbacks. At your suggestion I'm looking for a good way to change the design. I agree, the D type system is way superior to that of C.
Starting to get into mixins too, although I'm a bit wary of them. I know they're not macros, but I once had to debug (and eventually rewrote) ~5000 lines of macros that calculate interpolated XYZ values...still recovering :)
Cheers, Stewart
