deps/boost_1_63_0/boost/math/tools/detail/rational_horner1_3.hpp

   1 //  (C) Copyright John Maddock 2007.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5 //
   6 //  This file is machine generated, do not edit by hand
   7
   8 // Polynomial evaluation using Horners rule
   9 #ifndef BOOST_MATH_TOOLS_POLY_RAT_3_HPP
  10 #define BOOST_MATH_TOOLS_POLY_RAT_3_HPP
  11
  12 namespace boost{ namespace math{ namespace tools{ namespace detail{
  13
  14 template <class T, class U, class V>
  15 inline V evaluate_rational_c_imp(const T*, const U*, const V&, const mpl::int_<0>*) BOOST_MATH_NOEXCEPT(V)
  16 {
  17    return static_cast<V>(0);
  18 }
  19
  20 template <class T, class U, class V>
  21 inline V evaluate_rational_c_imp(const T* a, const U* b, const V&, const mpl::int_<1>*) BOOST_MATH_NOEXCEPT(V)
  22 {
  23    return static_cast<V>(a[0]) / static_cast<V>(b[0]);
  24 }
  25
  26 template <class T, class U, class V>
  27 inline V evaluate_rational_c_imp(const T* a, const U* b, const V& x, const mpl::int_<2>*) BOOST_MATH_NOEXCEPT(V)
  28 {
  29    if(x <= 1)
  30      return static_cast<V>((a[1] * x + a[0]) / (b[1] * x + b[0]));
  31    else
  32    {
  33       V z = 1 / x;
  34       return static_cast<V>((a[0] * z + a[1]) / (b[0] * z + b[1]));
  35    }
  36 }
  37
  38 template <class T, class U, class V>
  39 inline V evaluate_rational_c_imp(const T* a, const U* b, const V& x, const mpl::int_<3>*) BOOST_MATH_NOEXCEPT(V)
  40 {
  41    if(x <= 1)
  42      return static_cast<V>(((a[2] * x + a[1]) * x + a[0]) / ((b[2] * x + b[1]) * x + b[0]));
  43    else
  44    {
  45       V z = 1 / x;
  46       return static_cast<V>(((a[0] * z + a[1]) * z + a[2]) / ((b[0] * z + b[1]) * z + b[2]));
  47    }
  48 }
  49
  50
  51 }}}} // namespaces
  52
  53 #endif // include guard
  54