tor</span> <span class="identifier">iterator</span><span class="special">;</span>
      <span class="keyword">static</span> <span class="identifier">iterator</span> <span class="identifier">begin</span><span class="special">(</span><span class="identifier">C</span><span class="special">&amp;</span> <span class="identifier">x</span><span class="special">);</span>
      <span class="keyword">static</span> <span class="identifier">iterator</span> <span class="identifier">end</span><span class="special">(</span