Optionals with boolean values

gistfile1.swift

// The following would be great, if not for this error message
// “Extension of generic type Optional<T> from a different module cannot provide public declarations”
//
// ... which seems to be a bug in Swift:
// https://twitter.com/jckarter/status/513429427179356161


extension Optional : BooleanType {
    public var boolValue : Bool {
        get {
            switch (self) {
            case .Some:
                return true
            case .None:
                return false
            }
        }
    }
}