</span> <span class="identifier">Key</span>                                             <a name="boost.compute.flat_map.key_type"></a><span class="identifier">key_type</span><span class="special">;</span>              
  <span class="keyword">typedef</span> <span class="identifier">T</span>                                               <a name="boost.compute.flat_map.mapped_type"></a><span class="identifier">mapped_type</span><span class="special">;</span>           
  <span class="keyword">typedef</span> <