63e88f80
 Hu Chunming
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// (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 <cmath>
#include <cstdlib>
#include <cinttypes>
#include <cstdint>
#include <type_traits>
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 initialziation 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
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