On Apr 24, 2014, at 9:53 AM, Alex Zavatone <z...@mac.com> wrote: > What worried me was that I've never seen this used in Objective-C in this > manner. I've always used the ? operator to color the backgrounds of cells > with alternating row colors. It seemed like a stretch to actually use it to > achieve lazy instantiation and was wondering if there were any terrible > demons I'd be summoning from the bowels of the compiler if we actually > thought of using this approach.
No, it’s a supported feature across all types; we had to invent some interesting machinery a few years back to make it work consistently, akin to what we have to do for compound assignment on an Objective-C property reference, but that’s been in and stable for a long time. Anyway, it even works on non-POD C++ types, if you’re into that — although if you’re hyper-sensitive to performance, be aware that (unlike the normal ternary operator) it is not possible to construct the left operand directly into the result because of some subtle order-of-destruction issues, and so there does have to be an unelidable copy/move. John. _______________________________________________ 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
