Parameters
        ----------
        other : TimedeltaArray or ndarray[timedelta64]

        Returns
        -------
        result : ndarray[int64]

def _add_delta_tdi(self, other):
        """
        Parameters
        ----------
        other : TimedeltaArray or ndarray[timedelta64]

        Returns
        -------
        result : ndarray[int64]
        """
        assert isinstance(self.freq, Tick)  # checked by calling function

        delta = self._check_timedeltalike_freq_compat(other)
        return self._addsub_int_array(delta, operator.add).asi8