0nko

fun main(args: Array<String>) {
    val duck = Duck()
    duck.talked += { said -> println("Duck: $said") }

    duck.poke()
}

class Event<T>(val eventHandler: EventHandler<T>) {
    operator fun plusAssign(observer: (T) -> Unit) { eventHandler.observers.add(observer) }
    operator fun minusAssign(observer: (T) -> Unit) { eventHandler.observers.remove(observer) }