Re: Curious about copyWithZone message from NSArrayController in "GC required" project
Re: Curious about copyWithZone message from NSArrayController in "GC required" project
- Subject: Re: Curious about copyWithZone message from NSArrayController in "GC required" project
- From: Bill Bumgarner <email@hidden>
- Date: Sun, 13 Jan 2008 14:54:56 -0800
On Jan 13, 2008, at 2:48 PM, Luke Evans wrote:
>First and foremost, -copyWithZone: has absolutely nothing to do
with the differences between GC and non-GC. As its name implies,
it is all about copying an object, something that must be done in
either GC or non-GC.
Makes sense. I was wondering though if the fact I had a property
declared on A to get the array of B's made a difference. Reading
the docs on properties highlights some differences between GC and
non-GC, though from what you are saying, this should not effect a
copy.
Only if you declared the property to use 'copy' on set. Then, as
expected, it would attempt to copy the object.
>So -- first question -- what is triggering the -copyWithZone:
being sent to an instance of B in the first place?
Perhaps I need to take a look to see _exactly_ who is sending the
copyWithZone message to B, but the only time I've had this manifest
is when I've A's property that returns the array of B's bound as the
content of the NSArrayController - which generates some UI for the
list of B's. I've used put B's on all manner of collections
(arrays, sets) directly, with no hint of anybody calling
"copyWithZone".
You mentioned that you had implemented a -copyWithZone: on B? Can
you set a breakpoint on that and see what backtrace barfs up as a
result?
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