an><span class="identifier">PolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">PolygonRingIterator</span><span class="special">(</span><span class="identifier">p</span><span class="special">.</span><span class="identifier">interiors</span><span class="special">.</span><span cl