On 2011-06-29, at 18:09 , Matt Neuburg wrote: > As I said then, "Ownership is *never* something you are magically given.
Since when do you have to be owner of an object to be allowed to interact with it? This contradicts pretty much everything Apple has ever documented about Cocoa/Obj-C. Following your reasoning, Apple has to re-design Cocoa and re-write all guides and sample code, since no method should ever return a retain+autorelease result, instead all code must always follow the (currently inexistent rule): "An object returned by another object is only guaranteed to live as long as the object lives that returned it. To extend its lifetime you always have to retain the object". Right now this is only the case for collection classes and it is in fact *so special* that Apple *explicitly* points out this fact in their documentation. And to be honest, Apple only implemented them that way for performance reasons - if retain+autorelease was pretty much for free, I bet Apple had even used that for return values of collection classes; since that is what they do for pretty much all other classes. E.g. the "description" method of an object always returns a NSString that will for sure stay alive, even if you kill the object after calling "description" on it - I have never seen an implementation of description which hasn't. Nobody would seriously consider retaining this string. However, you are also missing my primary point: I have no problem with the fact that an object won't live longer than it's "parent"; this is just something that "nonatomic" doesn't tell me. Nonatomic tells me that the operation is not atomic, fine, but I don't expect it to influence object live duration; those are two completely different things not related to each other. Also it's pretty much funny how both answers I received so far concentrated on this remark, but none of them answered a single of the various questions I have asked in my mail (and *THOSE* were my primary points). Now that I have learned what nonatomic means to retain properties, it would be nice to know what nonatomic means to "assign" and "copy" properties for example. Kind regards, Markus_______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
