">mpfr_float_100</span></code>
      internally by the Boost.Math library.
    </p>
<div class="caution"><table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../../doc/src/images/caution.png"></td>
<th align="left">Caution</th>
</tr>
<tr><td align="left" valign="top">
<p>
        In C++11 you should never store an expression template using:
      </p>
<p>
        <code class="computeroutput"><span class="keyword">auto</span> <spa