s="special">++</span><span class="identifier">_ringIter</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="keyword">void</span> <span class="identifier">decrement</span><span class="special">()</span>
    <span class="special">{</span>
        <span class="special">--</span><span class="identifier">_ringIter</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="keyword">void</span> <span class="identifier">advance</span><span class="