() const final { <span class="keywordflow">return</span> <span class="keyword">this</span>; }</div><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;<span class="keyword">protected</span>:</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <span class="keyword">enum</span> {</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;     