>Name</th>
<th>Expression</th>
<th>Type</th>
<th>Semantics</th>
</tr></thead>
<tbody><tr>
<td><p>Construction</p></td>
<td><p>X()</p></td>
<td><p><span class="type">X</span></p></td>
<td><p>Construct an instance of the type with default parameters.</p></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="idm1161"></a><h2>Models</h2>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><span class="simplelist"><span class="type">int</spa