class="lineno">  271</span>&#160;        <span class="keywordtype">int</span> do_encoding() <span class="keyword">const</span> noexcept <span class="keyword">override</span></div><div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;        {</div><div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;            <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;        }</div><div clas