David,
Class B is a parser.  It is passed NSData to parse (weak reference)
and the Array (weak reference) from Class A.  The results of the Data
parse are placed into the Array.  Class A will be around for the life
of the application.  Class B will be released (set to nil) after
completing the parse.
I chose this approach rather than delegation.

Thoughts?

On Jan 31, 11:25 am, David Duncan <david.dun...@apple.com> wrote:
> On Jan 31, 2012, at 9:05 AM, R wrote:
>
> > never mind..... the class was getting dealloc.  Still getting use to ARC 
> > and new ivar techniques.
>
> As a point of design here, without further knowledge on why your "ClassB" is 
> keeping a weak reference to the target mutable array (rather than a strong 
> one) this seems like a bad design choice. Weak references should generally be 
> used in order to break retain cycles (and even then you still need to think 
> carefully about where the weak pointer should go in such a design).
>
> Given the statements about your design, it seems like there are probably 
> better ways for you to put the whole thing together, primarily as it seems 
> you are trying to setup a producer-consumer pattern.
> --
> David Duncan
>
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