Method GetUint64Key

base/attribute.h:79–83

  }

  absl::optional<uint64_t> GetUint64Key() const {
    return absl::holds_alternative<uint64_t>(value_)
               ? absl::optional<uint64_t>(absl::get<2>(value_))
               : absl::nullopt;
  }

  absl::optional<absl::string_view> GetStringKey() const {
    return absl::holds_alternative<std::string>(value_)