ss="language-swift">Distance : _SignedIntegerType = Int</code>
<div class="comment">
    <p>A type that can represent the number of steps between pairs of
<code>Self</code> values where one value is reachable from the other.</p>

<p>Reachability is defined by the ability to produce one value from
the other via zero or more applications of <code>successor</code>.</p>
</div>
</div>
</td>
</tr>


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

</table>







<h3>Instance 