any built-in floating-point type you will
        encounter has an appropriate <a class="link" href="../lanczos.html" title="The Lanczos Approximation">Lanczos
        approximation</a> defined for it. It is also possible, given enough machine
        time, to generate further <a class="link" href="../lanczos.html" title="The Lanczos Approximation">Lanczos approximation</a>'s
        using the program libs/math/tools/lanczos_generator.cpp.
      </p>
<p>
        The return type of these functions is compute