Generic class that conforms to Comparable in Swift

Question

I\'m attempting to create a simple generic node class that conforms to the Comparable protocol so that I can easily compare nodes without accessing their key. When I attempt

Answer 1

You were very close. Small syntax issue Try this:

class Node: Comparable {

    var key: D!
    var next:Node?
    var prev:Node?

    init( key:D ) {

        self.key = key
    }

}

func <  (lhs:Node, rhs:Node) -> Bool {
    return lhs.key < rhs.key
}

func ==  (lhs:Node, rhs:Node) -> Bool {
    return lhs.key == rhs.key
}