Igor Stasenko wrote:
> There is a basic class, BasicSourceCodeManager
> which declares protocol, so you can make a subclass of it. Also, it
> doesn't forcing you to use sourcePointer to be only integer values.

Do us all a favor and do NOT name classes "Basic" or "Abstract" or 
"Pure". Such names show utter lack of understanding of the problem 
domain. Being abstract follows from the abstract concept represented 
(Behavior, Number, Collection, String) and concrete entities have more 
concrete names (Class, LargePositiveInteger, WeakSet, ByteString).

Cheers,
   - Andreas