 class="p">,</span> <span class="kt">int</span> <span class="n">x</span><span class="p">,</span> <span class="kt">int</span> <span class="n">width</span><span class="p">);</span>

  <span class="n">iterator_from_2d</span><span class="o">&amp;</span> <span class="k">operator</span><span class="o">++</span><span class="p">();</span> <span class="c1">// if (++_x&lt;_width) ++_p.x(); else _p+=point_t(-_width,1);</span>

  <span class="p">...</span>
<span class="k">private</span><span class="o">:</span>
  <span 