Method AsError

common/value.h:833–835

  optional_ref<const ErrorValue> AsError() const& ABSL_ATTRIBUTE_LIFETIME_BOUND;
  absl::optional<ErrorValue> AsError() &&;
  absl::optional<ErrorValue> AsError() const&& {
    return common_internal::AsOptional(AsError());
  }

  // Performs a checked cast from a value to an int value,
  // returning a non-empty optional with either a value or reference to the