rom_member</span><span class="special">&lt;</span><span class="identifier">switcher</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span>  <span class="identifier">pbase2_type</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">base_from_member</span><span class="special">&lt;</span><span class="identifier">switcher</span><span class="special">,