keyword"> const  </span>{ <span class="keywordflow">return</span> parent_t::base_reference(); }
<a name="l00175"></a>00175 };
<a name="l00176"></a>00176 
<a name="l00177"></a>00177 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;
<a name="l00178"></a>00178 <span class="keyword">struct </span>const_iterator_type&lt;memory_based_step_iterator&lt;Iterator&gt; &gt; {
<a name="l00179"></a>00179     <span class="keyword">typedef</span> memory_based_step_iterator&lt;type