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shotamatsuda/ratio.h

Last active August 16, 2016 15:07
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ratio.h
#include <ratio>
namespace detail {
template <class... Args>
struct RatioAdd;
template <class R1, class R2>
struct RatioAdd<R1, R2> {
using Type = std::ratio_add<R1, R2>;
};
template <class R1, class R2, class... Args>
struct RatioAdd<R1, R2, Args...> {
using Type = typename RatioAdd<
std::ratio_add<R1, R2>,
Args...
>::Type;
};
template <class... Args>
struct RatioSubtract;
template <class R1, class R2>
struct RatioSubtract<R1, R2> {
using Type = std::ratio_subtract<R1, R2>;
};
template <class R1, class R2, class... Args>
struct RatioSubtract<R1, R2, Args...> {
using Type = typename RatioSubtract<
std::ratio_subtract<R1, R2>,
Args...
>::Type;
};
template <class... Args>
struct RatioMultiply;
template <class R1, class R2>
struct RatioMultiply<R1, R2> {
using Type = std::ratio_multiply<R1, R2>;
};
template <class R1, class R2, class... Args>
struct RatioMultiply<R1, R2, Args...> {
using Type = typename RatioMultiply<
std::ratio_multiply<R1, R2>,
Args...
>::Type;
};
template <class... Args>
struct RatioDivide;
template <class R1, class R2>
struct RatioDivide<R1, R2> {
using Type = std::ratio_divide<R1, R2>;
};
template <class R1, class R2, class... Args>
struct RatioDivide<R1, R2, Args...> {
using Type = typename RatioDivide<
std::ratio_divide<R1, R2>,
Args...
>::Type;
};
} // namespace detail
template <class... Args>
using RatioAdd = typename detail::RatioAdd<Args...>::Type;
template <class... Args>
using RatioSubtract = typename detail::RatioSubtract<Args...>::Type;
template <class... Args>
using RatioMultiply = typename detail::RatioMultiply<Args...>::Type;
template <class... Args>
using RatioDivide = typename detail::RatioDivide<Args...>::Type;
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