[swift-evolution] [SE-0011] Re-considering the replacement keyword for "typealias"
Dave Abrahams
dabrahams at apple.com
Sat Dec 19 14:54:13 CST 2015
> On Dec 19, 2015, at 12:17 PM, Michael Henson via swift-evolution <swift-evolution at swift.org> wrote:
>
> 1) Do you agree about using “associatedtype”?
> 2) If not, which keyword would you prefer to use? why? (you can introduce a new one)
>
> There is another alternative. Rather than trying to come up with another brand-new keyword, we can re-use one that has an existing and appropriate meaning: required.
>
> Example:
>
> protocol ExampleProtocol {
> required typealias Element
> typealias MethodSignature = (arg: Element) -> Bool
>
> ... etc
> }
>
> It's a little more verbose at the point of use but the declarations are relatively uncommon and this usage is clearly separate from regular typealias declarations.
I think this is a big improvement over associatedtype, except that the type that satisfies the requirement needn't be a typealias. I would therefore prefer "requiredtype."
-Dave
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