fier">stream_type</span><span class="special">;</span>  <span class="comment">// Output stream type. </span>

  <span class="comment">// <a class="link" href="basic_text_ostream_backend.html#boost.log.sinks.basic_text_ostream_backendconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="basic_text_ostream_backend.html#idm46093045079472-bb"><span class="identifier">basic_text_ostream_backend</span></a><span class="special">(</span><span class="special">)</span><span class="specia