set&lt;N&gt;&amp; end)</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span>        {</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>            <span class="keywordtype">bool</span> copy_construct = !mask.any();</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span>            <span class="keywordflow">if</span>(copy_construct)</div>
<div class="line"><a id="l00496" name="l00496"></a><span cl