On 8 Mar 2012, at 16:58, Quincey Morris wrote:

> 
>> A more robust solution is a probably a separate -dispose method.
> 
> Yes, though knowing when to call it can be a puzzle in itself, if there are 
> multiple references to the object. In general, you'll probably need to invent 
> a reference counting mechanism to keep track of when it's OK for your dispose 
> method to actually dispose of things. That sounds ironic in a GC environment, 
> but there's nothing wrong with reference counting when you need to keep 
> count. :)

Thanks for the input Quincey.
This sounds like the approach I should take.

On 8 Mar 2012, at 17:09, Nick Zitzmann wrote:
> 
> But if you really must use -finalize to clean up something that's not a 
> manually allocated class or data structure, then at least make sure whatever 
> you're doing is thread-safe, because -finalize is always called on a 
> background thread. +defaultManager is not thread-safe IIRC.
Thanks Nick.
I had toyed with the idea of using a static NSMutableSet instance to stash the 
ivar NSStrings (which should stop them getting collected along with self) but I 
had forgotten that finalise doesn't get called on the main thread.

Regards

Jonathan Mitchell
Mugginsoft LLP

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