I'm not sure whether it was supposed to be supported or not, but either way
it's a reasonable feature request. Please file at bugs.swift.org.
Jordan
> On Jan 11, 2018, at 14:41, Kenny Leung via swift-users
> <swift-users@swift.org> wrote:
>
> Hi All.
>
> I’d like to be lazy and leave out the classname on a key path whenever
> possible. I thought that if PartialKeyPath was specified as the argument
> type, that meant the compiler should be able to figure out what the class is,
> but this does not seem to be the case.
>
> Here’s an example that works.
>
> class ThePath {
> var isWinding:Bool?
> }
>
> func walk<T>(aPath:T, forKey:PartialKeyPath<T>) {
> }
>
> func walkThePath(aPath:ThePath, forKey:PartialKeyPath<ThePath>) {
> }
>
> func test() {
> let path = ThePath()
> walkThePath(aPath:path, forKey:\ThePath.isWinding)
> walk(aPath:path, forKey:\ThePath.isWinding)
> }
>
> If you do this then it complains:
>
> func test() {
> let path = ThePath()
> walkThePath(aPath:path, forKey:\.isWinding) // Expression type '()' is
> ambiguous without more context
> walk(aPath:path, forKey:\.isWinding) // Type of expression is
> ambiguous without more context
> }
>
> Should I be able to do this?
>
> Thanks!
>
> -Kenny
>
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