Swifters:
I’m running into a type inference problem when attempting to pass a
generic type which is generic to a generic type to a function which expects a
generic type. I’ll explain:
I have a function:
func add<Observer: ProcedureObserver>(observer: Observer) where
Observer.Procedure == Procedure
Which I’m sending a parameter of type:
struct BlockObserver<T: ProcedureProcotol>: ProcedureObserver
Which has been provided a type through this function:
func networkProcedureProgressViewObserver<T: URLRequestRoutable, U:
Decodable>() -> BlockObserver<NetworkProcedure<T, U>> where U == U.DecodedType
However, calling add(observer: networkProcedureProgressViewObserver()) results
in the error: Generic parameter ‘Observer’ could not be inferred. I’ve tried
everything I can think of to help the inference but nothing works. Am I correct
in thinking this is a limitation of the current generics system not being able
to propagate the type information from NetworkProcedure<T, U> to
BlockObserver<NetworkProcedure<T, U>> to the function?
Jon
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