ygonRingIterator</span> <span class="identifier">end</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">_cbegin</span><span class="special">(</span><span class="identifier">begin</span><span class="special">),</span> <span class="identifier">_cend</span><span class="special">(</span><span class="identifier">end</span><span class="special">),</span> <span class="identifier">isCIterSet</span><span class="special">(</span><span class="keyword">true</span><span class="s