Method MarkFinished

cpp/src/arrow/util/future.h:403–403

\brief Producer API: mark Future finished The Future's result is set to `res`.

  ///
  /// The Future's result is set to `res`.
  void MarkFinished(Result<ValueType> res) { DoMarkFinished(std::move(res)); }

  /// \brief Mark a Future<> completed with the provided Status.
  template <typename E = ValueType, typename = typename std::enable_if<