getRingIter</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span><span class="keyword">return</span> <span class="identifier">_ringIter</span><span class="special">;}</span>

    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_facade</span><span class="special">&lt;</span><span class="identifier">PolyRingIterator</span><span class=