[swift-evolution] [swigt-evolution] [Pitch] Make NSOrderedSet behave like any other collections from Foundation

[Tony Parker]

Hi Remy, Brent,

We’re thinking about it but there are no plans for Swift 3 in this respect (although I think we’re going to keep the NS prefix on these types).

One of the complexities with this type is its performance characteristics, especially when used with CoreData (the reason it was introduced). CoreData relies a lot on proxying for performance reasons, but there is currently an impedance mismatch between that behavior and Swift’s focus on static typing.

- Tony

> On Jun 17, 2016, at 10:43 AM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> Unlike its companion collections like NSArray, NSDictionary, and NSSet, NSOrdered is still a class rather than a struct and has a subclass that is still NSMutableOrderedSet. This should probably receive the same treatment as the other classes
> 
> Swift Evolution proposal SE-0069 "Mutability and Foundation Value Types" notes at the bottom <https://github.com/apple/swift-evolution/blob/master/proposals/0069-swift-mutability-for-foundation.md>:
> 
>> The following classes were considered and rejected or deferred for the described reasons:
>> …
>> 	• OrderedSet, CountedSet: We will consider these types in a future proposal.
> 
> 
> So sit tight—the Foundation team is already thinking about this. (That doesn't mean you'll necessarily see it this year, though.)
> 
> -- 
> Brent Royal-Gordon
> Architechies
> 
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