/span> <span class="o">&lt;</span><span class="k">typename</span> <span class="n">Locator</span><span class="o">&gt;</span>  <span class="c1">// Models PixelLocatorConcept</span>
<span class="k">class</span> <span class="nc">iterator_from_2d</span>
<span class="p">{</span>
<span class="k">public</span><span class="o">:</span>
  <span class="n">iterator_from_2d</span><span class="p">(</span><span class="k">const</span> <span class="n">Locator</span><span class="o">&amp;</span> <span class="n">loc</span><span