<span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">x</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

    <span class="keyword">void</span> <span class="identifier">advance</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">iterator_adaptor</span><span class="special">::</span><span class="identifier">difference_type</span> <span c