       to some placeholders for <code class="computeroutput"><span class="identifier">short_</span></code>,
          <code class="computeroutput"><span class="identifier">int_</span></code>, <code class="computeroutput"><span class="identifier">long_</span></code>
          and <code class="computeroutput"><span class="identifier">long_long</span></code> types. But,
          first, we enable these placeholders in namespace boost::spirit:
        </p>
<p>
</p>
<pre class="programlisting"><span class="keywo