条件协议一致性？

Question

我想做这样的事情：

class SomeClass<Element> { }
extension SomeClass: SomeProtocol where Element: String { }

它告诉我：

Extension of type "SomeClass" with constraints cannot have an inheritance clause.

到目前为止，我本可以发誓这是 protocol/extension/generic/associatedtype 范式的基本特征之一。还有其他方法可以实现吗？

Answer 1

作为 Paul，您现在可以在 Swift 4

protocol Nameable {
    var name:String {get set}
}
func createdFormattedName<T:Nameable>(_ namedEntity:T) -> String where T:Equatable {
    //Only entities that conform to Nameable which also conform to equatable can call this function
    return "This things name is " + namedEntity.name
}

Answer 2

这是在 Swift 4.1 中实现的。

条件协议一致性？

Conditional protocol conformance?

generics

protocols

constraints

swift