I read the following passage (reproduced verbatim) in a book ..

"Weak references were added in Mac OS X Leopard and effectively zero out the 
reference if the referenced object is released. This is primarily used when the 
garbage collector is turned on, but it is a helpful flag to use when doing 
non-GC development (such as for the iPhone) as well."

This is in a paragraph explaining __weak in a piece of code. 

I understand that __weak references are zeroing in GC code but in memory 
managed code I didn't think they did anything at all. Is the text I quoted 
incorrect? _______________________________________________

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