On Sun, Dec 11, 2011 at 10:41 AM, Ben Kennedy <b...@zygoat.ca> wrote: > On 11 Dec 2011, at 8:58 am, Matt Neuburg wrote: > >> Now, I think I know why [NSString string] is declared as returning an id - >> it's because it's a class cluster, > > Despite this however, why then don't the cluster classes implement a protocol > (e.g. one named NSString), and then NSString can return an id<NSString> > rather than a plain id?
Because it's a pain in the ass to define a protocol for each class with a convenience constructor that you expect might be subclassed. In ToT clang we now have the `instancetype` keyword that can replace the `id` keyword in most of these cases: http://clang.llvm.org/docs/LanguageExtensions.html#objc_instancetype --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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
