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https://github.com/bolero-MURAKAMI/Sprout.git
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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
#ifndef SPROUT_CSTDLIB_DIV_HPP
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#define SPROUT_CSTDLIB_DIV_HPP
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#include <cstddef>
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#include <cstdlib>
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#include <type_traits>
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#include <sprout/config.hpp>
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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namespace detail {
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# define SPROUT_DIV_T_TRAITS_IMPL(DIV_T) \
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typedef DIV_T type; \
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static SPROUT_CONSTEXPR std::size_t offsetof_quot = offsetof(DIV_T, quot); \
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static SPROUT_CONSTEXPR std::size_t offsetof_rem = offsetof(DIV_T, rem);
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template<typename T>
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struct div_t_traits {};
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template<>
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struct div_t_traits<int> {
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public:
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SPROUT_DIV_T_TRAITS_IMPL(std::div_t);
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};
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template<>
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struct div_t_traits<long> {
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public:
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SPROUT_DIV_T_TRAITS_IMPL(std::ldiv_t);
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};
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template<>
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struct div_t_traits<long long> {
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public:
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SPROUT_DIV_T_TRAITS_IMPL(std::lldiv_t);
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};
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# undef SPROUT_DIV_T_TRAITS_IMPL
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extern void* enabler;
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template<
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typename T,
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typename std::enable_if<
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sprout::detail::div_t_traits<T>::offsetof_quot == 0
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>::type*& = sprout::detail::enabler
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>
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SPROUT_CONSTEXPR typename sprout::detail::div_t_traits<T>::type div_impl(T const& numer, T const& denom) {
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return {numer / denom, numer % denom};
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}
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template<
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typename T,
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typename std::enable_if<
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sprout::detail::div_t_traits<T>::offsetof_rem == 0
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>::type*& = sprout::detail::enabler
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>
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SPROUT_CONSTEXPR typename sprout::detail::div_t_traits<T>::type div_impl(T const &numer, T const& denom) {
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return {numer % denom, numer / denom};
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}
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} // namespace detail
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// 7.20.6.2 div<69>Cldiv<69>C‹y‚Ñ lldiv ŠÖ<C5A0>”
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SPROUT_CONSTEXPR std::div_t div(int numer, int denom) {
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return sprout::detail::div_impl(numer, denom);
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}
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SPROUT_CONSTEXPR std::ldiv_t ldiv(long numer, long denom) {
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return sprout::detail::div_impl(numer, denom);
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}
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SPROUT_CONSTEXPR std::lldiv_t lldiv(long long numer, long long denom) {
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return sprout::detail::div_impl(numer, denom);
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}
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SPROUT_CONSTEXPR std::ldiv_t div(long numer, long denom) {
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return sprout::ldiv(numer, denom);
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}
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SPROUT_CONSTEXPR std::lldiv_t div(long long numer, long long denom) {
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return sprout::lldiv(numer, denom);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTDLIB_DIV_HPP
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