class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">CharT</span>                                                  <a name="boost.log.expressions.wrapped_formatter_actor.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">FunT</span>                                                  