class="identifier">m_iterator</span><span class="special">;</span> <span class="comment">// exposition only</span>
<span class="special">};</span>
</pre>
<p>
          __ base_parameters_
        </p>
<p>
          .. _requirements:
        </p>
<h3>
<a name="iterator.generic.adaptor.adaptor_reference.h1"></a>
          <span class="phrase"><a name="iterator.generic.adaptor.adaptor_reference.requirements"></a></span><a class="link" href="adaptor.html#iterator.generic.adaptor.adaptor_reference.requirements">