cial">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="channel_visitor.html" title="Struct template channel_visitor">channel_visitor</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="keyword">void</span> <a name="boost.log.expressions.channel_severi_idp36944880.channel_visitor.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>

  <span class="comment">// <a class="link" 