lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;::</span><span class="identifier">value_type</span>      <span class="identifier">char_type</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span>                                 <span class="identifier">string_type</span><span class="speci