Le 21 juil. 08 à 20:50, Markus Spoettl a écrit :
[...]
I'm wondering if there is a general rule or mechanism that suggests
what to do in such a case. For instance, how are delegates
implemented in AppKit, are they retained? If so, when are they
released. It can't be in -dealloc, otherwise everything would lock
itself out of deallocation?
Thoughts?
In the general case, there is no rule or mechanism to deal with retain
cycles other than implementing something equivalent to a garbage
collector. In some situations, however, the specific semantics and
life-cycle of the objects you are dealing with allow implementing more
simpler, ad hoc solutions (e.g., ownership management in the view
hierarchy). Still, this requires notable housekeeping efforts and is
often error prone. If you are in a situation where you can make use of
Cocoa's garbage collector, you should go for it. It will free you from
a bunch of low-level memory management tasks, including having to care
about cyclic references.
Philippe Mougin
http://www.fscript.org
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