al>;</span>
</pre></blockquote>

<p>
This possibility is fully exploited by predefined key extractors provided
by Boost.MultiIndex, making it simpler to define <code>multi_index_container</code>s
where elements are pointers or references to the actual objects. The following
specifies a <code>multi_index_container</code> of pointers to employees sorted by their
names.
</p>

<blockquote><pre>
<span class=keyword>typedef</span> <span class=identifier>multi_index_container</span><span class=special>&lt;</span>
