  void readErr(const AsyncSocketException& ex) noexcept override {
    ReadCallbackBase::readErr(ex);
    std::cerr << "ReadErrorCallback::readError" << std::endl;
    setState(STATE_SUCCEEDED);
  }
  void readErr(const AsyncSocketException& ex) noexcept override {
    ReadCallbackBase::readErr(ex);
    std::cerr << "ReadErrorCallback::readError" << std::endl;
    setState(STATE_SUCCEEDED);
  }