lass="identifier">lex</span><span class="special">::</span><span class="identifier">token_def</span><span class="special">&lt;&gt;</span></code> template) and a token itself
            (for instance represented by the <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">lexertl</span><span class="special">::</span><span class="identifier">token</span><span class="special">&lt;&gt;</span></code> template).
          </p>
<p>
            The 