ass="term">Returns:</span></p></td>
<td>the first element</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>will not throw</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id331110-bb"></a><span class="identifier">reference</span> <a name="id331115-bb"></a><span class="identifier">back</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">const_reference</span> <a name="i