  <p>
                  floor(numeric_limits&lt;T&gt;::digits * 0.4)
                </p>
              </td>
</tr>
</tbody>
</table></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            The C++ Standard cube root function <a href="http://en.cppreference.com/w/cpp/numeric/math/cbrt" target="_top">std::cbrt</a>
            is only defined for built-in or fundamental types, so cannot be used
            with any User-Defined floating-point