Are Swift variables atomic?

Question

In Objective-C you have a distinction between atomic and nonatomic properties:

@property (nonatomic, strong) NSObject *nonatomicObject;
@property (atomic, st         


        

Answer 1

From Swift 5.1 you can use property wrappers to make specific logic for your properties. This is atomic wrapper implementation:

@propertyWrapper
struct atomic {
    private var value: T
    private let lock = NSLock()

    init(wrappedValue value: T) {
        self.value = value
    }

    var wrappedValue: T {
      get { getValue() }
      set { setValue(newValue: newValue) }
    }

    func getValue() -> T {
        lock.lock()
        defer { lock.unlock() }

        return value
    }

    mutating func setValue(newValue: T) {
        lock.lock()
        defer { lock.unlock() }

        value = newValue
    }
}

How to use:

class Shared {
    @atomic var value: Int
...
}