case tensorflow::AttrValue::VALUE_NOT_SET:
      status->status =
          InvalidArgument("Attribute '", attr_name, "' has no value set");
      break;
  }
  return metadata;
}

void TF_OperationGetAttrString(TF_Operation* oper, const char* attr_name,
                               void* value, size_t max_length,
                               TF_Status* status) {
  const auto* attr = GetAttrValue(oper, attr_name, status);