onalIterator</span><span class="special">&gt;::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">*</span>                                       <span class="identifier">pointer</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="keywo