I’m using an NSMapTable object with weak value references, in an ARC-based
target. Unfortunately I’ve been told that this code crashes on OS X 10.7 —
initializing the table raises an exception "Requested configuration not
supported.” I’ve tried adjusting the option flags but without success. Is there
a way to make this work, or does NSMapTable just not support ARC-based weak
references in 10.7?
More detail: Here’s the code I’ve been using:
_map = [[NSMapTable alloc] initWithKeyOptions:
NSPointerFunctionsStrongMemory |
NSPointerFunctionsObjectPersonality
valueOptions:
NSPointerFunctionsWeakMemory |
NSPointerFunctionsObjectPersonality
capacity: 100];
On re-reading the docs yesterday, I saw that one is not supposed to use
NSPointerFunctions flags with NSMapTable, so I changed the code to
_map = [[NSMapTable alloc] initWithKeyOptions: NSMapTableStrongMemory
valueOptions: NSMapTableWeakMemory
capacity: 100];
which doesn’t work either; and I noticed that NSMapTableWeakMemory was only
added in 10.8. It replaces a similar NSMapTableZeroingWeakMemory constant, but
the docs say this "uses GC weak read and write barriers, and dangling pointer
behavior otherwise”, which implies it doesn’t work correctly with ARC.
—Jens
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