haracter type. </span>
  <span class="keyword">typedef</span> <span class="identifier">base_type</span><span class="special">::</span><span class="identifier">string_type</span> <a name="boost.log.sinks.syslog_backend.string_type"></a><span class="identifier">string_type</span><span class="special">;</span>           <span class="comment">// String type that is used to pass message test. </span>
  <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em