> On Jul 4, 2017, at 5:48 PM, Jacob Bandes-Storch <[email protected]> wrote:
>
> On Tue, Jul 4, 2017 at 7:21 AM, David Baraff <[email protected]
> <mailto:[email protected]>> wrote:
>
> func decoded(_ input: Any) -> Set {
> if let listVal = input as? [Set.Element] {
> return Set(listVal)
> }
> return self
> }
>
>
> This looks a little weird — what is `self` here? It might be more appropriate
> to use a `static func` or even a failable `init?`.
I figure out how to do this right. Something like:
protocol DecodableFromAny {
static func fromAny(_ payload:Any) -> Self?
}
extension Array : DecodableFromAny {
static func fromAny(_ payload: Any) -> Array? {
if let x = payload as? [Array.Element] {
return x
}
return nil
}
}
func decodeMe<T>(_ payload:Any) -> T? {
if let dt = T.self as? DecodableFromAny {
return type(of: dt).fromAny(payload) as! T
} else {
return payload as? T
}
}
I got tripped up not realizing I could cast “T.self” to the protocol, and then
call it once i invoked type(of:) on that. much much nicer this way.
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