Swift Generic constrained by Protocol

swift.swift

// protocols

protocol Connection {
    init()
}

protocol Factory<T> {
    associatedtype T: Connection
    func create() -> T
}

// implementation

class RealConnection: Connection {
    required init() {

    }
}

class RealFactory<T>: Factory where T: Connection {

    func create() -> T {
        T.init()
    }

}

// usage

let factory = RealFactory<RealConnection>()
let connection = factory.create()