Method GetItemAsObject

Common/Core/vtkCollection.cxx:254–284

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
vtkObject* vtkCollection::GetItemAsObject(int i) VTK_FUTURE_CONST
{
  vtkCollectionElement* elem = this->Top;

  if (i < 0)
  {
    return nullptr;
  }

  if (i == this->NumberOfItems - 1)
  {
    // optimize for the special case where we're looking for the last elem
    elem = this->Bottom;
  }
  else
  {
    while (elem != nullptr && i > 0)
    {
      elem = elem->Next;
      i--;
    }
  }
  if (elem != nullptr)
  {
    return elem->Item;
  }
  else
  {
    return nullptr;
  }
}

//------------------------------------------------------------------------------
void vtkCollection::ReplaceItem(int i, vtkObject* a)