class="lineno">  183</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> isNaN()<span class="keyword"> const</span>{</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;        <span class="keywordflow">if</span>(isnan(x) &amp;&amp; isnan(y) ){</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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