Method HasObserver

Common/Core/vtkObject.cxx:500–510

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//------------------------------------------------------------------------------
vtkTypeBool vtkSubjectHelper::HasObserver(unsigned long event)
{
  for (auto& [key, obs] : this->Observers)
  {
    if (obs.Event == event || obs.Event == vtkCommand::AnyEvent)
    {
      return 1;
    }
  }
  return 0;
}

//------------------------------------------------------------------------------
vtkTypeBool vtkSubjectHelper::HasObserver(unsigned long event, vtkCommand* cmd)