/a> in the examples section
for an application of <code>composite_key</code>.
</p>

<h3><a name="composite_keys_hash">Composite keys and hashed indices</a></h3>

<p>
Composite keys can also be used with hashed indices in a straightforward manner:
</p>

<blockquote><pre>
<span class=keyword>struct</span> <span class=identifier>street_entry</span>
<span class=special>{</span>
  <span class=comment>// quadrant coordinates</span>
  <span class=keyword>int</span> <span class=identifier>x</span><span class=specia