be used with</span>
   <span class="comment">// random access iterators...</span>
   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special">&lt;</span>
         <span class="identifier">RandomAccessIterator</span> <span class="special">&gt;::</span><span class="identifier">iterator_category</span> <span class="identifier">cat</span><span class="special">;