="keyword">const</span><span class="special">;</span>
   <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">i</span><span class="special">)</span><span class="keyword">const</span> <span class="special">;</span>

   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span 