span class="special">;</span>    <span class="comment">// String type. </span>
  <span class="keyword">typedef</span> <span class="identifier">basic_formatting_ostream</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span> <a name="boost.log.expressions.wrapped_formatter_terminal.stream_type"></a><span class="identifier">stream_type</span><span class="special">;</span>    <span class="comment">// Formatting stream type. </span>
  <span class="keyw