n type to use. All of the token
            value types used for at least one of the token definitions have to be
            re-iterated for the token definition as well.
          </p>
<p>
</p>
<pre class="programlisting"><span class="comment">// This is the lexer token type to use. The second template parameter lists </span>
<span class="comment">// all attribute types used for token_def's during token definition (see </span>
<span class="comment">// calculator_tokens&lt;&gt; above). Here we use the pred