ss="comment">// Threading model being used. </span>
  <span class="keyword">typedef</span> <span class="identifier">ChannelT</span>                                     <a name="boost.log.sources.basic_channel_logger.channel_type"></a><span class="identifier">channel_type</span><span class="special">;</span>       <span class="comment">// Channel type. </span>
  <span class="keyword">typedef</span> <span class="identifier">attributes</span><span class="special">::</span><span class="identifier">mutable_const