pan class="special">{</span><span class="keyword">return</span> <span class="identifier">ConstRingIterator</span><span class="special">(</span><span class="identifier">r</span><span class="special">.</span><span class="identifier">lines</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());}</span>

<span class="keyword">inline</span> <span class="identifier">RingIterator</span> <span class="identifier">range_end</span><span class="special">(</span><span class="i