="special">;</span>
    <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
        </p>
<p>
          The full cpp file for this example can be found here: <a href="../../../../../example/qi/sum.cpp" target="_top">../../example/qi/sum.cpp</a>
        </p>
<p>
          This is almost like our original numbers list example. We're incrementally
          building on top of our examples. This time though, like in the com