ase and use a fully Boost-licensed number
      type, then skip to <a class="link" href="tut/ints/cpp_int.html" title="cpp_int">cpp_int</a>
      for multiprecision integers, <a class="link" href="tut/rational/cpp_rational.html" title="cpp_rational">cpp_rational</a>
      for rational types, <a class="link" href="tut/floats/cpp_dec_float.html" title="cpp_dec_float">cpp_dec_float</a>
      for multiprecision floating-point types and <a class="link" href="tut/complex/cpp_complex.html" title="cpp_complex">cpp_