>00253 
<a name="l00255"></a>00255 <span class="comment">//  HasDynamicXStepTypeConcept</span>
<a name="l00257"></a>00257 <span class="comment"></span>
<a name="l00258"></a>00258 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;
<a name="l00259"></a>00259 <span class="keyword">struct </span>dynamic_x_step_type&lt;memory_based_step_iterator&lt;Iterator&gt; &gt; {
<a name="l00260"></a>00260     <span class="keyword">typedef</span> memory_based_step_iterator&lt;Iterat