Method GetBoolKey

base/attribute.h:91–95

  }

  absl::optional<bool> GetBoolKey() const {
    return absl::holds_alternative<bool>(value_)
               ? absl::optional<bool>(absl::get<4>(value_))
               : absl::nullopt;
  }

  bool operator==(const AttributeQualifier& other) const {
    return IsMatch(other);