<span class="keyword">typedef</span> <span class="identifier">PolyRingIterator</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">QRing</span><span class="special">*&gt;::</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">QRing</span><span class="special">&gt;</span> <