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Reading source code of my current project, I see:
[self retain]
in one class, in its init method.
I don’t understand exactly the reason.
Reading memory management rules from Apple, I don’t see anything about this, and I don’t see any hypothetical [self release].
The object is asserting ownership of itself when it is initialised. The only reason I can see that this might be useful is if the object needs to guarantee its own existence until some event has happened. For example, it might run a timer and then release itself when the timer expires.
If it’s not documented and there is no corresponding release, it’s probably a bug.