ceph/src/boost/boost/math/ccmath/div.hpp

   1 //  (C) Copyright Matt Borland 2021.
   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 #ifndef BOOST_MATH_CCMATH_DIV_HPP
   7 #define BOOST_MATH_CCMATH_DIV_HPP
   8
   9 #include <cmath>
  10 #include <cstdlib>
  11 #include <cinttypes>
  12 #include <cstdint>
  13 #include <type_traits>
  14
  15 namespace boost::math::ccmath {
  16
  17 namespace detail {
  18
  19 template <typename ReturnType, typename Z>
  20 inline constexpr ReturnType div_impl(const Z x, const Z y) noexcept
  21 {
  22     // std::div_t/ldiv_t/lldiv_t/imaxdiv_t can be defined as either { Z quot; Z rem; }; or { Z rem; Z quot; };
  23     // so don't use braced initialziation to guarantee compatibility
  24     ReturnType ans {0, 0};
  25
  26     ans.quot = x / y;
  27     ans.rem = x % y;
  28
  29     return ans;
  30 }
  31
  32 } // Namespace detail
  33
  34 // Used for types other than built-ins (e.g. boost multiprecision)
  35 template <typename Z>
  36 struct div_t
  37 {
  38     Z quot;
  39     Z rem;
  40 };
  41
  42 template <typename Z>
  43 inline constexpr auto div(Z x, Z y) noexcept
  44 {
  45     if constexpr (std::is_same_v<Z, int>)
  46     {
  47         return detail::div_impl<std::div_t>(x, y);
  48     }
  49     else if constexpr (std::is_same_v<Z, long>)
  50     {
  51         return detail::div_impl<std::ldiv_t>(x, y);
  52     }
  53     else if constexpr (std::is_same_v<Z, long long>)
  54     {
  55         return detail::div_impl<std::lldiv_t>(x, y);
  56     }
  57     else if constexpr (std::is_same_v<Z, std::intmax_t>)
  58     {
  59         return detail::div_impl<std::imaxdiv_t>(x, y);
  60     }
  61     else
  62     {
  63         return detail::div_impl<boost::math::ccmath::div_t<Z>>(x, y);
  64     }
  65 }
  66
  67 inline constexpr std::ldiv_t ldiv(long x, long y) noexcept
  68 {
  69     return detail::div_impl<std::ldiv_t>(x, y);
  70 }
  71
  72 inline constexpr std::lldiv_t lldiv(long long x, long long y) noexcept
  73 {
  74     return detail::div_impl<std::lldiv_t>(x, y);
  75 }
  76
  77 inline constexpr std::imaxdiv_t imaxdiv(std::intmax_t x, std::intmax_t y) noexcept
  78 {
  79     return detail::div_impl<std::imaxdiv_t>(x, y);
  80 }
  81
  82 } // Namespaces
  83
  84 #endif // BOOST_MATH_CCMATH_DIV_HPP