 class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                    <a name="boost.log.sinks.basic_event_log_backend.event_composer_type"></a><span class="identifier">event_composer_type</span><span class="special">;</span>         <span class="comment">// Event composer type. </span>

  <span class="comment">// <a class="link" href="basic_event_log_backend.html#boost.log.sinks.basic_event_log_backendconstruct-copy-destruct">construct/copy/de