></a>00141 
<a name="l00142"></a>00142     <span class="keywordtype">void</span>            set_step(std::ptrdiff_t step) { _step=step; }
<a name="l00143"></a>00143 <span class="keyword">private</span>:
<a name="l00144"></a>00144     GIL_CLASS_REQUIRE(Iterator, boost::gil, <a class="code" href="g_i_l_0312.html" title="Concept of a random-access iterator that can be advanced in memory units (bytes or...">MemoryBasedIteratorConcept</a>)
<a name="l00145"></a>00145     difference_type _step;
<a name="l00146"></