us</code> objects corresponding to completed requests will be emitted through this output iterator.</p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>If the <code class="computeroutput">out</code> parameter was provided, a pair containing the output iterator <code class="computeroutput">out</code> after all of the <code class="computeroutput">status</code> objects have been written through it and an iterator referencing the first completed reque