Re: Newbie: Object life within a method scope
Re: Newbie: Object life within a method scope
- Subject: Re: Newbie: Object life within a method scope
- From: Guy English <email@hidden>
- Date: Tue, 22 Feb 2005 18:02:17 -0500
Read This:
http://www.stepwise.com/Articles/Technical/2001-03-11.01.html
There are no implict retains/releases on method calls.
Basically: if you create an object you're responsible for getting rid
of it. Be that telling it to autorelease or calling release directly.
That's it.
Knowing *when* you create an object is what the article above will tell you.
Guy
On Tue, 22 Feb 2005 16:44:49 -0600, Justin Spahr-Summers
<email@hidden> wrote:
> With the same exceptions Apple mentioned (multithreaded, DO), yes, it
> is unnecessary to retain an object passed to a method. I don't know if
> passing an object to a method increments its retain count at all, but
> if it does, it will surely decrement it after the method.
>
> On Tue, 22 Feb 2005 16:59:58 -0500, Joseph Feld <email@hidden> wrote:
> > Hi all,
> >
> > Trying to get a handle on the whole retain and release system (my day job is
> > in the Java world and the GC has definitely spoiled me) and I'm curious
> > about the life of an object within a method scope. I found the Memory
> > Management: Object Ownership and Disposal document on the Apple Dev site and
> > it states: "A received object is normally guaranteed to remain valid within
> > the method it was received in (exceptions include multithreaded applications
> > and some Distributed Objects situations). That method may also safely return
> > the object to its invoker," which would seem to answer my question.
> > However, two bullet points later it warns: "Use retain and autorelease when
> > needed to prevent an object from being invalidated as a normal side-effect
> > of a message," which has me a bit confused about what normal side-effects of
> > a message might cause me to lose my object.
> >
> > So I guess my question is, if I'm not interested in an object beyond the
> > scope of the method receiving it is it still prudent to retain it to ensure
> > it survives the scope, or is that unnecessary?
> >
> > Thanks,
> > Joe
> >
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