Method ProgressQueueWorker

test/cpp/asyncprogressqueueworker.cpp:15–20

class ProgressQueueWorker : public AsyncProgressQueueWorker<char> {
 public:
  ProgressQueueWorker(
      Callback *callback
    , Callback *progress
    , int iters)
    : AsyncProgressQueueWorker(callback), progress(progress)
    , iters(iters) {}

  ~ProgressQueueWorker() {
    delete progress;