a set of operations everyone needs to implement in order to
be a useful <code>NSSet</code> subclass.</p>
</div>

<table class="standard">
<tr>
<th id="inheritance">Inheritance</th>
<td>
<code class="inherits">_NSCopyingType, _NSFastEnumerationType, _ShadowProtocol</code>
<span class="viz"><a href="hierarchy/">View Protocol Hierarchy &rarr;</a></span>
</td>
</tr>



<tr>
<th>Import</th>
<td><code class="language-swift">import Swift</code></td>
</tr>

</table>


<h3>Initializers</h3>
<div class="declaration" 