a</span> <span class="special">&gt;&gt;</span> <span class="identifier">b</span> <span class="special">&gt;&gt;</span> <span class="identifier">c</span>
</pre>
<p>
        is:
      </p>
<pre class="programlisting"><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">,</span> <span class="identifier">B</span><span class="special">,</span> <span class="identifier">C</s