On Thu, Jan 26, 2012 at 2:44 PM, Conrad Shultz <con...@synthetiqsolutions.com> wrote: > However, __block variables are NOT retained automatically by a block > during capture, so this breaks the retain cycle.
__block variables *are* retained under ARC: http://clang.llvm.org/docs/AutomaticReferenceCounting.html#misc.blocks The important bit of the code that Jan cited isn't that myController is annotated with __block, it's that the block nils out the myController variable when it executes. This works because the block is a completion handler—it's only executed once, so there's a sensible time for it to engage in cleanup. Long-lived block arguments, however, need a different strategy. This is why the Transitioning to ARC Release Notes also recommend strategies that use __weak (or __unsafe_unretained if you're targeting older OSes). --Kyle Sluder _______________________________________________ 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
