[swift-evolution] Generic `typealias`s

Kevin Ballard kevin at sb.org
Fri Dec 4 19:29:56 CST 2015

I've filed a ticket on bugs.swift.org to serve as a hint to any
interested party that this is something that is actively desired and
patches are welcome.


I figure that's probably the right course of action for obvious
improvements that we know we want but aren't candidates for the full swift-
evolution process.

-Kevin Ballard

On Fri, Dec 4, 2015, at 04:08 PM, Joe Groff wrote:
>> On Dec 4, 2015, at 3:04 AM, Dapeng Gao <gdapeng at icloud.com> wrote:
>> It would be handy if Swift can support generic `typealias`s, which
>> would probably look like this:
>> typealias Handler<Element> = [Element] -> Void
>> One common way to achieve this is to define a generic `struct` and
>> use a nested `typealias`:
>> struct HandlerWrapper<Element> { typealias Hander = [Element]
>> -> Void }
>> HandlerWrapper<SomeType>.Hander
> Definitely. I'd say this falls under the (totally arbitrary) umbrella
> of "obvious things that we didn't get around to implementing yet"
> instead of formal changes to the language. If you (or anyone else!)
> were to implement this, we'd consider the pull request immediately.
> -Joe
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