enerators (<img src="theme/lens.gif"
         width="15" height="16"> A functor generator is a function that returns
         a functor). For our purpose, Spirit has a functor generator
         <tt>push_back_a(c)</tt>. In brief, this semantic action, when called,
         <b>appends</b> the parsed value it receives from the parser it is
         attached to, to the container <tt>c</tt>.
  </p>
    <p>
      Finally, here is our complete comma-separated list parser:
    </p>
    
<pre><code><font color="#00