Zeroing Weak References in ARC
If my reading of Mike Ash’s “Zeroing Weak References” writeup is correct, weak references are like
assign references without ARC. However, if the referenced object is deallocated, instead of getting a “dangling pointer” (meaning a pointer that points to a deallocated object), the pointer gets set to
Is this right, and does this happen with any property marked
assign (when ARC is active)?
If this is correct, this would eliminate a lot of SIGABRTs.
Solutions Collect From Internet About “Zeroing Weak References in ARC”
It’s mostly right, but
assign properties are still treated the same as they ever were, only
weak ones are zeroing. Another caveat is that zeroing weak references are only available in Mac OS X ≥ 10.7 and iOS ≥ 5. While the rest of ARC was backported to 10.6 and iOS 4, weak references cannot be used at all on these OS’s.
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