ss="variablelist"><table border="0">
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<td><p><span class="term"><code class="computeroutput">ch</code></span></p></td>
<td><p>The character to test. </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">mask</code></span></p></td>
<td><p>The character class bitmask against which to test. </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>mask is a bitmask returned by lookup_class