unction <a href="../../../../../../libs/math/doc/html/math_toolkit/next_float/float_distance.html" target="_top">Boost.Math
            float_distance</a>. One or two bits distance means that all results
            are effectively 'correct'. Zero means 'exact' - the nearest <a href="http://en.wikipedia.org/wiki/Floating_point#Representable_numbers.2C_conversion_and_rounding" target="_top">representable</a>
            value for the floating-point type.
          </li>
</ul></div>
<p>
        The cube-root 