585da50d7d
This PR adds the code of Boost.Math as of version 1.89 into the third-party directory, as discussed in a recent RFC [1]. The goal is for this code to be used as a back-end for the C++17 Math Special Functions. As explained in third-paty/README.md, this code is cleared for usage inside libc++ for the Math Special functions, however the LLVM Foundation should be consulted before using this code anywhere else in the LLVM project, due to the fact that it is under the Boost Software License (as opposed to the usual LLVM license). See the RFC [1] for more details. [1]: https://discourse.llvm.org/t/rfc-libc-taking-a-dependency-on-boost-math-for-the-c-17-math-special-functions
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
// (C) Copyright Matt Borland 2021.
|
|
// Use, modification and distribution are subject to the
|
|
// Boost Software License, Version 1.0. (See accompanying file
|
|
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_MATH_CCMATH_DIV_HPP
|
|
#define BOOST_MATH_CCMATH_DIV_HPP
|
|
|
|
#include <cinttypes>
|
|
#include <cstdint>
|
|
#include <boost/math/ccmath/detail/config.hpp>
|
|
|
|
#ifdef BOOST_MATH_NO_CCMATH
|
|
#error "The header <boost/math/div.hpp> can only be used in C++17 and later."
|
|
#endif
|
|
|
|
namespace boost::math::ccmath {
|
|
|
|
namespace detail {
|
|
|
|
template <typename ReturnType, typename Z>
|
|
inline constexpr ReturnType div_impl(const Z x, const Z y) noexcept
|
|
{
|
|
// std::div_t/ldiv_t/lldiv_t/imaxdiv_t can be defined as either { Z quot; Z rem; }; or { Z rem; Z quot; };
|
|
// so don't use braced initialization to guarantee compatibility
|
|
ReturnType ans {0, 0};
|
|
|
|
ans.quot = x / y;
|
|
ans.rem = x % y;
|
|
|
|
return ans;
|
|
}
|
|
|
|
} // Namespace detail
|
|
|
|
// Used for types other than built-ins (e.g. boost multiprecision)
|
|
template <typename Z>
|
|
struct div_t
|
|
{
|
|
Z quot;
|
|
Z rem;
|
|
};
|
|
|
|
template <typename Z>
|
|
inline constexpr auto div(Z x, Z y) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<Z, int>)
|
|
{
|
|
return detail::div_impl<std::div_t>(x, y);
|
|
}
|
|
else if constexpr (std::is_same_v<Z, long>)
|
|
{
|
|
return detail::div_impl<std::ldiv_t>(x, y);
|
|
}
|
|
else if constexpr (std::is_same_v<Z, long long>)
|
|
{
|
|
return detail::div_impl<std::lldiv_t>(x, y);
|
|
}
|
|
else if constexpr (std::is_same_v<Z, std::intmax_t>)
|
|
{
|
|
return detail::div_impl<std::imaxdiv_t>(x, y);
|
|
}
|
|
else
|
|
{
|
|
return detail::div_impl<boost::math::ccmath::div_t<Z>>(x, y);
|
|
}
|
|
}
|
|
|
|
inline constexpr std::ldiv_t ldiv(long x, long y) noexcept
|
|
{
|
|
return detail::div_impl<std::ldiv_t>(x, y);
|
|
}
|
|
|
|
inline constexpr std::lldiv_t lldiv(long long x, long long y) noexcept
|
|
{
|
|
return detail::div_impl<std::lldiv_t>(x, y);
|
|
}
|
|
|
|
inline constexpr std::imaxdiv_t imaxdiv(std::intmax_t x, std::intmax_t y) noexcept
|
|
{
|
|
return detail::div_impl<std::imaxdiv_t>(x, y);
|
|
}
|
|
|
|
} // Namespaces
|
|
|
|
#endif // BOOST_MATH_CCMATH_DIV_HPP
|