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Multicast Delegate with hash table
class MulticastDelegate <T> {
private let delegates: NSHashTable<AnyObject> = NSHashTable.weakObjects()
func add(delegate: T) {
delegates.add(delegate as AnyObject)
func remove(delegate: T) {
for oneDelegate in delegates.allObjects.reversed() {
if oneDelegate === delegate as AnyObject {
func invoke(invocation: (T) -> ()) {
for delegate in delegates.allObjects.reversed() {
invocation(delegate as! T)
func += <T: AnyObject> (left: MulticastDelegate<T>, right: T) {
left.add(delegate: right)
func -= <T: AnyObject> (left: MulticastDelegate<T>, right: T) {
left.remove(delegate: right)
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