Implementing a default equals method for a protocol

I've been trying to implement a protocol and protocol extension that provides a default == method in swift. Something like this:

protocol NameProtocol: Equatable {
    func getName() -> String
}

extension NameProtocol{}

func ==<T: NameProtocol>(lhs: T, rhs: T) -> Bool{
    return lhs.getName() == rhs.getName()
}

Then a class like this:

class NamedObject: NSObject, NameProtocol {

    let name: String

    init(name: String) {
        self.name = name
        super.init()
    }

    func getName() -> String {
        return self.name
    }

}

However, the custom == method is never called:

 let one = NamedObject(name: "Name")
 let two = NamedObject(name: "Name")
 if one == two {
     NSLog("EQUAL")
 }
 else{
     NSLog("NOT EQUAL")
 }

Am I doing something wrong here?

UPDATE:

From the answers I got it looks like what i'm trying to accomplish isn't really possible. The only way to come close is to subclass (which has its obvious drawbacks). I'm going to keep a lookout for a proper solution.