[swift-evolution] Swift's Optional Int as NSNumber in Objective-C

[T.J. Usiyan]

The argument is not about whether or not it should come through as an
object. The argument is about the fact that *sometimes* it would come
through as an object and other times it would not. Optionality isn't an
obvious way to make that decision.

TJ

On Mon, May 15, 2017 at 3:03 PM, Charlie Monroe <charlie at charliemonroe.net>
wrote:

> This is not much of an argument given that NSString is an object in ObjC
> (heap-allocated), String in Swift is an struct and also given that most
> NSNumber's nowadays are not really allocated, but just tagged pointers.
>
> Given that NSNumber is immutable, you get the value semantics anyway...
>
> On May 15, 2017, at 1:09 PM, T.J. Usiyan via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> My understanding of the reasoning is that `NSNumber` is an object in
> Objective-C and not a struct. There is already one level of decision when
> translating to objc in that regard. Switching between reference
> semantics/class and value semantics because of optionality is surprising.
>
> On Mon, May 15, 2017 at 5:52 AM, Kenny Leung via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> > On May 12, 2017, at 9:56 AM, John McCall via swift-evolution <
>> swift-evolution at swift.org> wrote:
>>
>> > Exporting Int? as an optional NSNumber does not feel obvious and
>> idiomatic when we would export Int as NSInteger.  It feels like reaching
>> for an arbitrary solution.
>>
>> I don’t understand this reasoning. I’ve had cause to distinguish 0 from
>> null in both Objective-C and Java, and I would do exactly the same thing.
>>
>> -Kenny
>>
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