lse
             return Reference

   <span class="bold"><strong>D'</strong></span> = if (Difference is use_default)
             return iterator_traits&lt;Base&gt;::difference_type
         else
             return Difference
</pre>
<h3>
<a name="iterator.generic.adaptor.adaptor_reference.h3"></a>
          <span class="phrase"><a name="iterator.generic.adaptor.adaptor_reference.operations"></a></span><a class="link" href="adaptor.html#iterator.generic.adaptor.adaptor_reference.operations">Operations</a>
 