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: Jiva DeVoe <email@hidden>
- Date: Tue, 22 Feb 2005 21:24:02 -0700
I think the important thing to understand here is that objects received
back from other methods should be assumed to be "autoreleased".
What this means is that they still have a retain count > 0, but they
are marked to be released later in the autorelease loop. Here's the
thing though, the autorelease loop runs as part of the internal
application event loop, which you will not hit until you exit your
current method (unless you have something like another thread running
which might cause the loop to run).
On Feb 22, 2005, at 2:59 PM, Joseph Feld 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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--
Jiva DeVoe
http://www.devoesquared.com
PowerCard - Intuitive Project Management Software for Mac OS X
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