On Dec 24, 2009, at 2:23 AM, John Engelhart wrote:
> On Wed, Dec 23, 2009 at 12:05 PM, Bill Bumgarner <b...@mac.com> wrote:
>
>> On Dec 22, 2009, at 11:49 PM, Franck Zoccolo wrote:
>>
>>> You said that you're using garbage collection. When using GC retain and
>>> release messages do nothing, and the retain count is not used to
>>> determine when an objet can be freed from memory.
>>
>> If -retainCount is returning 1, then he can't be using GC. Under GC,
>> -retainCount -- being the utterly useless method that it is that no one
>> should ever call -- returns self.
>>
>> b.bum
>
>
> Wait, what? I could understand that under GC -retain might be nothing more
> than the equivalent of "- (id)retain { return(self); }", but -retainCount?
> Is it really "- (NSUInteger)retainCount { return((NSUInteger)self); }" ?
> Wouldn't it make more sense to just return 1, or maybe something like
> NSUIntegerMax?
There is no implementation of -retainCount under GC. There's a short-circuit
in obj_msgSend that detects the selector for the memory management methods
which are no-ops. Since -retain and -autorelease have to return self, that's
what the short-circuit does. -retainCount gets the same treatment and so the
same return value. The return value doesn't matter, anyway. (Frankly, it
hardly matters under managed memory, either.)
Regards,
Ken
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