"hierarchy/">View Protocol Hierarchy &rarr;</a></span>
</td>
</tr>

<tr>
<th id="aliases">Associated Types</th>
<td>
<span id="aliasesmark"></span>
<div class="declaration">
<code class="language-swift">Index = Bit</code>
<div class="comment">
    <p>A type that represents a valid position in the collection.</p>

<p>Valid indices consist of the position of every element and a
&quot;past the end&quot; position that&#39;s not valid for use as a subscript.</p>
</div>
</div>
<div class="declaration">
<code clas