Or perhaps paint the bikeshed
enum Something<(Int32, Int32)> { … }
-DW
> On Jan 16, 2017, at 11:51 AM, Anton Zhilin via swift-evolution
> <[email protected]> wrote:
>
> This idea by Karl made me branch off a new thread.
>
> 2017-01-16 21:28 GMT+03:00 Karl Wagner <[email protected]
> <mailto:[email protected]>>:
>
>
>
> It would be helpful for synthesised RawRep conformance. The inheritance-like
> syntax we have now is awful - it makes people think that RawRepresentable is
> some kind of magic protocol that will allow special compiler jango to happen.
>
> You could see why they think that. This looks very much like the enum is
> going to *be* an Int32:
>
> enum Something: Int32 {
> case oneThing = 36
> case anotherThing = 42
> }
>
> This is also one of the icky parts to allowing tuples of integer/string
> literals (something people ask for quite a lot). It would look like you’re
> deriving your enum from a non-nominal type:
>
> enum Something: (Int32, Int32) {
> case oneThing = (3, 12)
> case anotherThing = (5, 9)
> }
>
>
> Even if Swift gains newtype, it’s not that case. The enum does not gain
> methods or behavior of the specified type. It’s just a shorthand, hinting the
> compiler to provide correct RawRepresentable conformance.
>
> I suggest to invent a new syntax for this type hinting for RawRepresentable.
> For example, it can be an annotation:
>
> @raw(Int32) enum Something {
> // ...
> }
> Or a contextual keyword:
>
> enum Something : raw(Int32) {
> // ...
> }
> Perhaps, he most uniform and explicit of syntaxes:
>
> enum Something : RawRepresentable {
> case oneThing = 36
> case anotherThing = 42
> }
>
> enum AnotherThing : RawRepresentable {
> typealias RawValue = Int32
> case oneThing
> case anotherThing
> }
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