Multicast Delegate Swift Prototype (WIP - currently storing strong references to delegates)

MulticastDelegate

// Multicast delegate prototype. Better solution in Obj-C here: http://arielelkin.github.io/articles/objective-c-multicast-delegate/

// Implementations

class CarListener: Hashable {
    var hashValue = Int(arc4random())
    
    func receivedNoise(noiseEmitter: CarListenable) {
        
    }
}

func ==(lhs: CarListener, rhs: CarListener) -> Bool {
    return lhs === rhs
}

class CarListenable: Listenable {
    var listeners: Set<CarListener>?
    
    func something() {
        if let listeners = listeners {
            listeners.map { $0.receivedNoise(self) }
        }
    }
}

// Generic Protocol

protocol Listenable {
    typealias Listener : Hashable
    
    var listeners: Set<Listener>? { get set }
    
    mutating func addListener(newListener: Listener)
    mutating func removeListener(newListener: Listener)
}

extension Listenable {
    mutating func addListener(newListener: Listener) {
        // TODO: create weak reference here
        listeners?.insert(newListener)
    }
    
    mutating func removeListener(listenerToRemove: Listener) {
        // TODO: create weak reference here
        listeners?.remove(listenerToRemove)
    }
}