Method has_area

libs/indexer/drules_struct.pb.cc:5200–5202

.AreaRuleProto area = 3;

// .AreaRuleProto area = 3;
bool DrawElementProto::has_area() const {
  return this != internal_default_instance() && area_ != NULL;
}
void DrawElementProto::clear_area() {
  if (GetArenaNoVirtual() == NULL && area_ != NULL) delete area_;
  area_ = NULL;