ype"></a><span class="identifier">formatter_function_type</span><span class="special">;</span>  <span class="comment">// Formatter function. </span>
  <span class="keyword">typedef</span> <span class="identifier">ActorT</span><span class="special">&lt;</span> <span class="identifier">terminal_type</span> <span class="special">&gt;</span>                                   <a name="boost.log.expressions.format_named_scope_actor.base_type"></a><span class="identifier">base_type</span><span class="special">;</s