</span> <span class="number">2</span><span class="special">&gt;</span>  <span class="identifier">pbase3_type</span><span class="special">;</span>

    <span class="keyword">typedef</span> <span class="identifier">flow_regulator</span>  <span class="identifier">base1_type</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">fan</span><span class="special">&lt;</span><span class="number">6</span><span class="special">&gt;</span>          <span class="identifie