eroutput"><span class="identifier">int_</span></code> or <code class="computeroutput"><span class="identifier">double_</span></code>,
          return the <code class="computeroutput"><span class="keyword">int</span></code> or <code class="computeroutput"><span class="keyword">double</span></code> value converted from the matched
          input sequence. Other primitive parser components have other intuitive
          attribute types, such as for instance <code class="computeroutput"><span class="identifie