Inout parameter in async callback does not work as expected

Question

I\'m trying to insert functions with inout parameter to append data received from async callback to an outside array. However, it does not work. And I tried eve

Answer 1

@rintaro perfectly explained why it doesn't work, but if you really want to do that, using UnsafeMutablePointer will do the trick:

func getOneUserApiData(path: String, c: UnsafeMutablePointer) {
    var req = NSURLRequest(URL: NSURL(string: path)!)
    var config = NSURLSessionConfiguration.ephemeralSessionConfiguration()
    var session = NSURLSession(configuration: config)
    var task = session.dataTaskWithRequest(req) {
        (data: NSData!, res: NSURLResponse!, err: NSError!) in
        println("c before: \(c.memory)")
        c.memory++
        println("c after: \(c.memory)")
        println("thread on: \(NSThread.currentThread())")
    }

    task.resume()
}