WeakDemo.swift

class Man {
    var closure: (() -> Void)?
    var name: String = "Frank"
    
    init() {
        closure = { print("Init with \(self.name)") }
    }
    
    deinit {
        print("Deinit")
    }
}


var frank: Man? = Man()
frank?.closure?() // Init with Frank
frank = nil