Horst Jäger wrote:
NSDictionary *di = [[NSDictionary alloc] init]; NSArray *ar = [di allKeys];
di is an empty NSDictionary. Therefore, ar will always be an empty immutable NSArray. Consequently, it's possible to return a singleton empty NSArray that's never released. I'm not saying this *is* happening, just that it *could* happen under the memory mgmt rules.
The code is fatally flawed because it doesn't follow the memory mgmt rules. All observed effects (like NSLog'ing the retainCount) rely on unspecified side-effects. You shouldn't be surprised when unspecified side-effects occur, nor should you count on them always occurring in the same way.
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