an></p></td>
<td>
<code class="computeroutput">true</code> if instance is
              empty, otherwise <code class="computeroutput">false</code>.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Nothing.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> std::type_info <span class="special">&amp;</span> <a name="id-1_3_5_5_2_1_2_13_2-bb"></a><span class="identifier">type</span><span class="special">(</span><span