olatile</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
      </p>
<p>
        we can import them all at once, with the following command:
      </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">import_class</span><span class="special">&lt;</span>
    <span class="identifier">alias</span><span class="special">,</span> <span class="identifier">f</span><span class