</a><span class="lineno">  171</span>&#160;    <span class="keyword">using</span> result_type = <span class="keyword">typename</span> std::common_type&lt;T, D&gt;::type;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    <span class="keywordflow">if</span> (d &lt; 0 || 0 &lt; d)</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    {</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;        <span class="