type</span><span class="special">::</span><span class="identifier">char_type</span>            <a name="boost.log.sinks.basic_text_ostream_backend.char_type"></a><span class="identifier">char_type</span><span class="special">;</span>    <span class="comment">// Character 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.basic_text_ostream_backend.string_typ