ratorType</code>
<div class="comment">
    <p>A type that provides the <em>sequence</em>&#39;s iteration interface and
encapsulates its iteration state.</p>
</div>
</div>
<div class="declaration inherited">
<code class="language-swift">Index : ForwardIndexType</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>
</di