Method ProgressWorker

test/cpp/asyncprogressworkerstream.cpp:26–32

class ProgressWorker : public AsyncProgressWorkerBase<T> {
 public:
  ProgressWorker(
      Callback *callback
    , Callback *progress
    , int milliseconds
    , int iters)
    : AsyncProgressWorkerBase<T>(callback), progress(progress)
    , milliseconds(milliseconds), iters(iters) {}

  ~ProgressWorker() {
    delete progress;