> <span class="identifier">Combiner</span><span class="special">::</span><span class="identifier">result_type</span>                                                     <a name="boost.signals2.signal.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>                
  <span class="keyword">typedef</span> <span class="identifier">Combiner</span>                                                                           <a name="boost.signals2.signal.combiner_type"></a><