pecial">);</span>
</pre>
<p>
          </p>
<p>
            Extracting the attribute variant (using <a href="http://www.boost.org/doc/html/variant.html" target="_top">Boost.Variant</a>):
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> 