Re: Trying to understand -- please help...
Re: Trying to understand -- please help...
- Subject: Re: Trying to understand -- please help...
- From: "Sherm Pendley" <email@hidden>
- Date: Wed, 21 May 2008 13:36:06 -0400
On Wed, May 21, 2008 at 12:47 PM, Peter Hudson <email@hidden> wrote:
> The line of code [NSArray arrayWithObjects: c0, ...c9, nil]; produces
> an array all right - but as you have used a class initializer, it will auto
> release
> when you return from the method where it was created.
No, because you have used a method other than the handful of listed
exceptions to the general rule, the array is not your responsibility to
release. It may be autoreleased, it may be a singleton, there may be some
other magic going on - you don't know and shouldn't care about which is
actually the case.
> Any initialiser with a "+" in front of it returns an autoreleased object
Nonsense. Initializers begin with -init, and they're called to initialize
objects created with +alloc. And some class methods (+alloc again, and
+allocWithZone, and +new) do carry with them the responsibility of a later
matching release.
> - hence you MUST retain them or else they are simply released
> when the autorelease pool they are created in is released - which you can
> treat
> as occurring at the end of the method in which the init occurs.
Nonsense again. The autorelease pool is emptied at the end of each iteration
through the event loop, and each iteration can encompass any number of
method calls.
> Do it like this [ [NSArray arrayWithObjects: c0, ...c9, nil] retain];
>
> and then it will stay around until you send it a release message,
> probably in the dealloc method;
>
> [cityArray release];
"Probably in the dealloc method"? Yet more nonsense. Retain/release logic
belongs in setter methods - you release the old object before assigning a
new one, and by doing so you encapsulate all of your memory management in
one place, where it's easy to maintain and debug.
You *seriously* need to read this: <
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html
>.
sherm--
--
Cocoa programming in Perl: http://camelbones.sourceforge.net
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