public
struct
AtomicInteger : ExpressibleByIntegerLiteral
{
    fileprivate let     queue = DispatchQueue(label: "AtomicInteger Queue", qos: .userInteractive)
    fileprivate var     internalValue: Int

    var             value: Int
    {
        get
        {
            var result: Int = 0
            self.queue.sync
            {
                result = self.internalValue
            }
            return result
        }
    }

    public
    init(_ inValue: Int)
    {
        self.internalValue = inValue
    }

    public
    init(integerLiteral inValue: Int)
    {
        self.internalValue = inValue
    }


}

func
+=(_ inLHS: inout AtomicInteger, _ inRHS: Int)
{
    inLHS.queue.sync
    {
        inLHS.internalValue += inRHS
    }
}

func
-=(_ inLHS: inout AtomicInteger, _ inRHS: Int)
{
    inLHS.queue.sync
    {
        inLHS.internalValue -= inRHS
    }
}

extension
Int
{
    init(_ inValue: AtomicInteger)
    {
        self.init(inValue.value)
    }
}

var a = AtomicInteger(4)