lues representing the token ids, but could be anything else
          convertible to an integer as well). The direct base class of any token
          definition class needs to be the template <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">lexer</span><span class="special">&lt;&gt;</span></code>, where the corresponding template
          parameter (here: <code class="computeroutput"><span class="identifier">lex</span><span class="spec