dwg_get_object_num_objects (const Dwg_Data *dwg)
{
  assert (dwg);
  return dwg->num_objects - dwg->num_entities;
}
dwg_get_object_num_objects (const Dwg_Data *dwg)
{
  assert (dwg);
  return dwg->num_objects - dwg->num_entities;
}