Method CheckForTermination

cpp/src/arrow/util/future.h:810–820

Future<BreakValueType> Loop(Iterate iterate) {
  struct Callback {
    bool CheckForTermination(const Result<Control>& control_res) {
      if (!control_res.ok()) {
        break_fut.MarkFinished(control_res.status());
        return true;
      }
      if (control_res->has_value()) {
        break_fut.MarkFinished(**control_res);
        return true;
      }
      return false;
    }

    void operator()(const Result<Control>& maybe_control) && {
      if (CheckForTermination(maybe_control)) return;