[swift-evolution] [Proposal] Allow static protocol extension methods to be called directly on the protocol

[Rasmus Kjeldsen]

I propose to allow static protocol extension methods to be used directly on the protocol.
This would enable the Factory-pattern to be elegantly implemented as in the example below:

protocol P {}

class A : P {}
class B : P {}

extension P {
	static func factory(type: Bool) -> P { return type ? A() : B()}
}

let a = P.factory(false) // <- Not possible in Swift 2, factory() can only be used on either A or B

Regards

Rasmus Friis Kjeldsen


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