> On 12 Jul 2017, at 19:24, Jens Alfke <j...@mooseyard.com> wrote: > >> While that’s true, the main reason, as I understand it, that ARC doesn’t >> know enough about the object’s lifetime is that non-ARC code may be calling >> the method. In an all-ARC world, a method could always just return objects >> with a +1 retain count, and the consumer could just assume that and always >> balance the retain. > > It could, but that results in _enormous_ numbers of retain/release calls. (I > speak from some experience, having once worked on performance optimization of > a project that did ref-counting this way.)
But an ARC compiler is smart enough to optimise these calls out of existence (in many cases). Jeremy _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
