an class="identifier">push_back</span><span class="special">(</span> <span class="identifier">future</span><span class="special">.</span><span class="identifier">get</span><span class="special">()</span> <span class="special">);</span>
    <span class="special">}</span>
    <span class="comment">// return vector to caller</span>
    <span class="keyword">return</span> <span class="identifier">results</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
        </p>
<p>
          Fo