Re: Properties and memory management
Re: Properties and memory management
- Subject: Re: Properties and memory management
- From: Negm-Awad Amin <email@hidden>
- Date: Tue, 5 Aug 2008 11:48:24 +0200
Am Di,05.08.2008 um 11:02 schrieb Ken Ferry:
On Tue, Aug 5, 2008 at 1:12 AM, Uli Kusterer
<email@hidden> wrote:
On 05.08.2008, at 05:55, Jonathan Hess wrote:
The implementation of the property will manage the retaining and the
releasing. You only need to worry about sending retain and release
messages
manually if you access the instance variable directly (not through a
property). The only place you would typically need to do that
would be in
your dealloc method.
Although in dealloc
self.myProperty = nil;
would also work, which has the added benefit that you'll notice
when you're
talking to an object that has already been released, because then
all its
object ivars will be NIL.
A disadvantage of this approach is that you'll be invoking the setter
when your object is partially torn down. If you later override or
implement the method, you are not likely to be thinking about the
possibility that the object is not in a valid state. Calling methods
from init has the same issue.
You may fire off observer methods too, which is probably undesirable.
This is the "mirror" of the problem, when you initialize an object. Of
course, theoretically in both cases the usage of setters are
dangerous. In most cases the deallocation of the object in reverse
order to its initialization will not lead to any problems. It is no
problem, when you have synthisized accessors, because they have noch
side-effects.
Amin
-Ken
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Amin Negm-Awad
email@hidden
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