> <span class="keyword">const</span><span class="special">;</span>
    <span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">base</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
    <span class="identifier">reference</span> <span class="keyword">operator</span><span class="special">*()</span> <span class="keyword">const</span><span class="special">;</span>
    <span class="