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Does NSNotificationCenter have zeroing weak references to observers ?

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Does NSNotificationCenter have zeroing weak references to observers ?

Subject: Does NSNotificationCenter have zeroing weak references to observers ?
From: Erik Buck <email@hidden>
Date: Wed, 13 Aug 2008 23:22:45 -0400

Does NSNotificationCenter use zeroing weak references to observers ?

I want to say "When using Cocoa’s automated memory garbage collection, NSNotificationCenter automatically un-registers observers that are no longer in use somewhere else in the application." I'm just not sure it's true. Can anyone save me the time of writing a test application? In my test program, how can I tell the difference between an observer for which the NSNotificationCenter has a strong reference and an observer that is about to be finalized but hasn't been yet ? Is this the classic "halting problem?"

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