在Swift中引用自己的类型？

class MyClass {
    var value: Int
    
    init(value: Int) {
        self.value = value
    }
    
    func updateValue(value: Int) {
        self.value = value
    }
}

class MyClass {
    var closure: (() -> Void)?
    
    func setupClosure() {
        closure = { [weak self] in
            self?.doSomething()
        }
    }
    
    func doSomething() {
        // 执行操作
    }
}

struct Point {
    var x: Int
    var y: Int
    
    mutating func moveBy(x: Int, y: Int) {
        self.x += x
        self.y += y
    }
}