Le 26 mai 2010 à 14:53, Graham Cox a écrit : > > On 26/05/2010, at 10:41 PM, vincent habchi wrote: > >> Hmmm... Let's say you have a class A with a private variable "priv" and b a >> pointer to a subclass of A. Is: >> >> [(A *)b priv] >> >> legal? > > > No. It's not legal syntax for accessing an ivar in any case - square brackets > invoke a method:- [instance method]. Obj-C does not have the concept of > private/public/protected methods, unlike C++. > > Perhaps you could ask is: > > (A*)b->priv legal? > > Depends. If priv is @private it is invisible to code other than within the > methods of class A itself, so if this code lived inside such a method it > would work, otherwise it would not. I don't think the cast makes any > difference.
Just for the record, to be exact, @private ivar is invisible to code other than within the class A @implementation. You can access private ivars from a plain C function defined in the class A @implementation block. > But this is not getting to the problem that the OP is having, which AFAICS is > unrelated to @private. @private is a Good Thing™ - often worth using. > > --Graham -- Jean-Daniel _______________________________________________ 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
