Thread Safe Weak Ref Queue

import Foundation

class WeakRef<T> where T: AnyObject {

    private let queue = DispatchQueue(label: "ThreadSafeWeakRef.queue", attributes: .concurrent)

    private(set) weak var _object: T?

    weak var object: T? {
        var result: T?

        queue.sync {
            result = _object
        }

        return result
    }


    init(object: T?) {
        queue.async(flags: .barrier) {
            self._object = object
        }
    }

}