On Jan 30, 2013, at 12:42 AM, Charles Srstka <[email protected]> wrote: > On Jan 30, 2013, at 1:25 AM, Greg Parker <[email protected]> wrote: >> Name the method `new...` instead of `create...`. Otherwise you do suffer an >> autorelease penalty with ARC. (`create...` is not one of the names that ARC >> assumes will return a retained result.) > > Huh? I thought ARC generated objc_autoreleaseReturnValue in this case, which > peeks up the stack to see if the caller is calling > objc_retainAutoreleasedReturnValue on it, and refrains from autoreleasing the > object if it does.
It does. All of that is relatively inexpensive, but still has a cost. Simply passing along the retained value as returned by -init... is free. (Ideally, +new... tail-calls -init...) -- Greg Parker [email protected] Runtime Wrangler _______________________________________________ Cocoa-dev mailing list ([email protected]) 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 [email protected]
