I wrote something to a similar effect in an earlier version of Swift. It might be of interest to readers http://jspha.com/posts/immutable_enumeration_in_swift/

I wrote something to a similar effect in an earlier version of Swift. It might be of interest to readers http://jspha.com/posts/immutable_enumeration_in_swift/ http://jspha.com/posts/immutable_enumeration_in_swift/ http://jspha.com/posts/calkin-wilf-in-swift/ http://jspha.com/posts/calkin-wilf-in-swift/