e <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span></code>
          like its friend, the <code class="computeroutput"><span class="identifier">use_terminal</span></code>
          specialization for our <code class="computeroutput"><span class="identifier">int_parser</span></code>.
          Obviously, we use <span class="emphasis"><em>use_operator</em></span> to enable the dereference
          for the qi::domain.
      