Method has_border

libs/indexer/drules_struct.pb.h:2309–2311

.LineDefProto border = 2;

// .LineDefProto border = 2;
inline bool AreaRuleProto::has_border() const {
  return this != internal_default_instance() && border_ != NULL;
}
inline void AreaRuleProto::clear_border() {
  if (GetArenaNoVirtual() == NULL && border_ != NULL) delete border_;
  border_ = NULL;