rns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code>
                when <code class="computeroutput"><span class="identifier">x</span></code> is finite
                (not infinity or NaN), <code class="computeroutput"><span class="keyword">false</span></code>
                otherwise.
              </li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="core.cmath.header_boost_core_cmath_hpp.classification_functio