"special">::</span><span class="identifier">iterator</span>           <a name="boost.interprocess.iunordered_set_index.iterator"></a><span class="identifier">iterator</span><span class="special">;</span>          
  <span class="keyword">typedef</span> <span class="identifier">index_type</span><span class="special">::</span><span class="identifier">const_iterator</span>     <a name="boost.interprocess.iunordered_set_index.const_iterator"></a><span class="identifier">const_iterator</span><span class="special