Swift: Generic Type conform Protocol

Question

i have some problem with generic type. I want to check if generic type conform some protocol and after pass to another generic function. For example i have function:

func requestSignal<T:Mappable>(target:Api) -> SignalProducer<[T], NSError> 

And i want to do something like this:

func request<T>(target:Api, withObjectType type: T.Type) {        
    if let mappableType = type as? Mappable.Type {
        let requestSignal: SignalProducer<[?????], NSError>  = self.requestSignal(target) } 

But if i tried pass T - it doesn't conform Mappable.

if pass mappableType - it is not a type

Answer 1

您可以将T定义为Mappable，就像在第一个函数中一样。

func request<T: Mappable>