nt">// <a class="link" href="counting_iterator.html#idp53401152-bb">private member functions</a></span>
  <span class="identifier">reference</span> <a class="link" href="counting_iterator.html#idp53401728-bb"><span class="identifier">dereference</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="counting_iterator.html#idp53402848-bb"><span class="identifier">equal</s