[swift-users] Using 'SomeProtocol' as a concrete type conforming to protocol 'SomeProtocol' is not supported

[Rien]

As to the why question: (just guessing here)

By the time the compiler want to know what type will be in the array, it cannot do so. The enum is a generic and thus without full type information (it only has partial type information).

Regards,
Rien

Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Swiftrien
Project: http://swiftfire.nl




> On 29 Dec 2016, at 00:41, Brandon Knope via swift-users <swift-users at swift.org> wrote:
> 
> I don’t understand why this is a problem
> 
> protocol Element {
>     
> }
> 
> enum ElementNode<T: Element> {
>     case element(T)
>     case empty
> }
> 
> var childElements = [ElementNode<Element>]()
> 
> I need to represent an array of my nodes that could be multiple kinds of elements
> 
> Is there a workaround?
> 
> Brandon
> _______________________________________________
> swift-users mailing list
> swift-users at swift.org
> https://lists.swift.org/mailman/listinfo/swift-users