Method Then

cpp/src/arrow/util/future.h:604–611

            typename OnComplete = ThenOnComplete<OnSuccess, OnFailure>,
            typename ContinuedFuture = typename OnComplete::ContinuedFuture>
  ContinuedFuture Then(OnSuccess on_success, OnFailure on_failure = {},
                       CallbackOptions options = CallbackOptions::Defaults()) const {
    auto next = ContinuedFuture::Make();
    AddCallback(OnComplete{std::forward<OnSuccess>(on_success),
                           std::forward<OnFailure>(on_failure), next},
                options);
    return next;
  }

  /// \brief Implicit constructor to create a finished future from a value
  Future(ValueType val) : Future() {  // NOLINT runtime/explicit