exclusivity.swift

func compute(_ a: inout Int, _ b: inout Int) {
    b = 100
    a = 10
}

var x = 0
var y = 0

compute(&x, &y)

dump((x,y))

struct Person {
    var name: String
    init(name: String) {
        self.name = name
    }
    mutating func setNameAndNotify(_ name: String, handler: () -> Void ) {
        self.name = name
        handler()
    }
}

var ray = Person(name: "ray")
ray.setNameAndNotify("Stephen") {
    ray.name = "haha"
}