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Code cleanup

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Mateusz Pusz
2018-09-28 10:53:21 -07:00
parent 312dbf4f81
commit 40ab45b506
3 changed files with 126 additions and 126 deletions
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44
src/include/units/dimension.h
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@ -58,18 +58,18 @@ namespace units {
}
template<typename T>
bool concept Exp = detail::is_exp<T>::value;
bool concept Exponent = detail::is_exp<T>::value;
// exp_less
template<Exp E1, Exp E2>
template<Exponent E1, Exponent E2>
struct exp_less : dim_id_less<typename E1::dimension, typename E2::dimension> {
};
// exp_invert
template<Exp Exponent>
template<Exponent E>
struct exp_invert;
template<typename BaseDimension, int Value>
@ -77,21 +77,21 @@ namespace units {
using type = exp<BaseDimension, -Value>;
};
template<Exp Exponent>
using exp_invert_t = typename exp_invert<Exponent>::type;
template<Exponent E>
using exp_invert_t = typename exp_invert<E>::type;
// dimension
template<Exp... Exponents>
using dimension = mp::type_list<Exponents...>;
template<Exponent... Es>
using dimension = mp::type_list<Es...>;
// is_dimension
namespace detail {
template<typename T>
struct is_dimension : std::false_type {};
template<Exp... Exponents>
struct is_dimension<dimension<Exponents...>> : std::bool_constant<(is_exp<Exponents>::value && ...)> {};
template<Exponent... Es>
struct is_dimension<dimension<Es...>> : std::bool_constant<(is_exp<Es>::value && ...)> {};
}
template<typename T>
@ -113,19 +113,19 @@ namespace units {
using type = dimension<>;
};
template<Exp E>
template<Exponent E>
struct dim_consolidate<dimension<E>> {
using type = dimension<E>;
};
template<Exp E1, Exp... ERest>
template<Exponent E1, Exponent... ERest>
struct dim_consolidate<dimension<E1, ERest...>> {
using rest = dim_consolidate_t<dimension<ERest...>>;
using type = std::conditional_t<std::is_same_v<rest, dimension<>>, dimension<E1>,
mp::type_list_push_front_t<rest, E1>>;
};
template<typename D, int V1, int V2, Exp... ERest>
template<typename D, int V1, int V2, Exponent... ERest>
struct dim_consolidate<dimension<exp<D, V1>, exp<D, V2>, ERest...>> {
using type = std::conditional_t<V1 + V2 == 0, dim_consolidate_t<dimension<ERest...>>,
dim_consolidate_t<dimension<exp<D, V1 + V2>, ERest...>>>;
@ -133,13 +133,13 @@ namespace units {
} // namespace detail
template<Exp... Exponents>
template<Exponent... Es>
struct make_dimension {
using type = detail::dim_consolidate_t<mp::type_list_sort_t<dimension<Exponents...>, exp_less>>;
using type = detail::dim_consolidate_t<mp::type_list_sort_t<dimension<Es...>, exp_less>>;
};
template<Exp... Exponents>
using make_dimension_t = typename make_dimension<Exponents...>::type;
template<Exponent... Es>
using make_dimension_t = typename make_dimension<Es...>::type;
@ -148,9 +148,9 @@ namespace units {
template<Dimension D1, Dimension D2>
struct dimension_multiply;
template<Exp... Exp1, Exp... Exp2>
struct dimension_multiply<dimension<Exp1...>, dimension<Exp2...>> {
using type = make_dimension_t<Exp1..., Exp2...>;
template<Exponent... E1, Exponent... E2>
struct dimension_multiply<dimension<E1...>, dimension<E2...>> {
using type = make_dimension_t<E1..., E2...>;
};
template<Dimension D1, Dimension D2>
@ -161,9 +161,9 @@ namespace units {
template<Dimension D1, Dimension D2>
struct dimension_divide;
template<Exp... Exp1, Exp... Exp2>
struct dimension_divide<dimension<Exp1...>, dimension<Exp2...>>
: dimension_multiply<dimension<Exp1...>, dimension<exp_invert_t<Exp2>...>> {
template<Exponent... E1, Exponent... E2>
struct dimension_divide<dimension<E1...>, dimension<E2...>>
: dimension_multiply<dimension<E1...>, dimension<exp_invert_t<E2>...>> {
};
template<Dimension D1, Dimension D2>

206
src/include/units/quantity.h
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@ -30,7 +30,7 @@ namespace units {
// is_quantity
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
template<Dimension D, typename Rep, mp::Ratio R>
class quantity;
namespace detail {
@ -39,8 +39,8 @@ namespace units {
struct is_quantity : std::false_type {
};
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
struct is_quantity<quantity<Dimension, Rep, Ratio>> : std::true_type {
template<Dimension D, typename Rep, mp::Ratio R>
struct is_quantity<quantity<D, Rep, R>> : std::true_type {
};
}
@ -60,50 +60,50 @@ namespace units {
namespace detail {
template<Quantity To, mp::Ratio CRatio, typename CRep, bool NumIsOne = false, bool DenIsOne = false>
template<Quantity To, mp::Ratio CR, typename CRep, bool NumIsOne = false, bool DenIsOne = false>
struct quantity_cast_impl {
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
static constexpr To cast(const quantity<Dimension, Rep, Ratio>& q)
template<Dimension D, typename Rep, mp::Ratio R>
static constexpr To cast(const quantity<D, Rep, R>& q)
{
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio::num) /
static_cast<CRep>(CRatio::den)));
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CR::num) /
static_cast<CRep>(CR::den)));
}
};
template<Quantity To, mp::Ratio CRatio, typename CRep>
struct quantity_cast_impl<To, CRatio, CRep, true, true> {
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
static constexpr To cast(const quantity<Dimension, Rep, Ratio>& q)
template<Quantity To, mp::Ratio CR, typename CRep>
struct quantity_cast_impl<To, CR, CRep, true, true> {
template<Dimension D, typename Rep, mp::Ratio R>
static constexpr To cast(const quantity<D, Rep, R>& q)
{
return To(static_cast<typename To::rep>(q.count()));
}
};
template<Quantity To, mp::Ratio CRatio, typename CRep>
struct quantity_cast_impl<To, CRatio, CRep, true, false> {
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
static constexpr To cast(const quantity<Dimension, Rep, Ratio>& q)
template<Quantity To, mp::Ratio CR, typename CRep>
struct quantity_cast_impl<To, CR, CRep, true, false> {
template<Dimension D, typename Rep, mp::Ratio R>
static constexpr To cast(const quantity<D, Rep, R>& q)
{
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CRatio::den)));
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CR::den)));
}
};
template<Quantity To, mp::Ratio CRatio, typename CRep>
struct quantity_cast_impl<To, CRatio, CRep, false, true> {
template<Dimension Dimension, typename Rep, mp::Ratio Ratio>
static constexpr To cast(const quantity<Dimension, Rep, Ratio>& q)
template<Quantity To, mp::Ratio CR, typename CRep>
struct quantity_cast_impl<To, CR, CRep, false, true> {
template<Dimension D, typename Rep, mp::Ratio R>
static constexpr To cast(const quantity<D, Rep, R>& q)
{
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio::num)));
return To(static_cast<typename To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CR::num)));
}
};
} // namespace detail
template<Quantity To, Dimension Dimension, typename Rep, mp::Ratio Ratio>
requires mp::Same<typename To::dimension, Dimension>
constexpr To quantity_cast(const quantity<Dimension, Rep, Ratio>& q)
template<Quantity To, Dimension D, typename Rep, mp::Ratio R>
requires mp::Same<typename To::dimension, D>
constexpr To quantity_cast(const quantity<D, Rep, R>& q)
{
using c_ratio = std::ratio_divide<Ratio, typename To::ratio>;
using c_ratio = std::ratio_divide<R, typename To::ratio>;
using c_rep = std::common_type_t<typename To::rep, Rep, intmax_t>;
using cast = detail::quantity_cast_impl<To, c_ratio, c_rep, c_ratio::num == 1, c_ratio::den == 1>;
return cast::cast(q);
@ -120,13 +120,13 @@ namespace units {
// quantity
template<Dimension Dimension, typename Rep, mp::Ratio Ratio = std::ratio<1>>
template<Dimension D, typename Rep, mp::Ratio R = std::ratio<1>>
class quantity {
Rep value_;
public:
using dimension = Dimension;
using dimension = D;
using rep = Rep;
using ratio = Ratio;
using ratio = R;
static_assert(!detail::is_quantity<Rep>::value, "rep cannot be a quantity");
static_assert(ratio::num > 0, "ratio must be positive");
@ -210,149 +210,149 @@ namespace units {
};
// clang-format off
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>
constexpr operator+(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>
constexpr operator+(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using ret = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using ret = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return ret(ret(lhs).count() + ret(rhs).count());
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>
constexpr operator-(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>
constexpr operator-(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using ret = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using ret = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return ret(ret(lhs).count() - ret(rhs).count());
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio, typename Rep2>
quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>
constexpr operator*(const quantity<Dimension, Rep1, Ratio>& q,
template<Dimension D, typename Rep1, mp::Ratio R, typename Rep2>
quantity<D, std::common_type_t<Rep1, Rep2>, R>
constexpr operator*(const quantity<D, Rep1, R>& q,
const Rep2& v)
{
using ret = quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>;
using ret = quantity<D, std::common_type_t<Rep1, Rep2>, R>;
return ret(ret(q).count() * v);
}
template<typename Rep1, Dimension Dimension, typename Rep2, mp::Ratio Ratio>
quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>
template<typename Rep1, Dimension D, typename Rep2, mp::Ratio R>
quantity<D, std::common_type_t<Rep1, Rep2>, R>
constexpr operator*(const Rep1& v,
const quantity<Dimension, Rep2, Ratio>& q)
const quantity<D, Rep2, R>& q)
{
return q * v;
}
template<Dimension Dimension1, typename Rep1, mp::Ratio Ratio1, Dimension Dimension2, typename Rep2, mp::Ratio Ratio2>
requires treat_as_floating_point_v<std::common_type_t<Rep1, Rep2>> || std::ratio_multiply<Ratio1, Ratio2>::den == 1
quantity<dimension_multiply_t<Dimension1, Dimension2>, std::common_type_t<Rep1, Rep2>, std::ratio_multiply<Ratio1, Ratio2>>
constexpr operator*(const quantity<Dimension1, Rep1, Ratio1>& lhs,
const quantity<Dimension2, Rep2, Ratio2>& rhs)
template<Dimension D1, typename Rep1, mp::Ratio R1, Dimension D2, typename Rep2, mp::Ratio R2>
requires treat_as_floating_point_v<std::common_type_t<Rep1, Rep2>> || std::ratio_multiply<R1, R2>::den == 1
quantity<dimension_multiply_t<D1, D2>, std::common_type_t<Rep1, Rep2>, std::ratio_multiply<R1, R2>>
constexpr operator*(const quantity<D1, Rep1, R1>& lhs,
const quantity<D2, Rep2, R2>& rhs)
{
using ret = quantity<dimension_multiply_t<Dimension1, Dimension2>, std::common_type_t<Rep1, Rep2>, std::ratio_multiply<Ratio1, Ratio2>>;
using ret = quantity<dimension_multiply_t<D1, D2>, std::common_type_t<Rep1, Rep2>, std::ratio_multiply<R1, R2>>;
return ret(lhs.count() * rhs.count());
}
template<typename Rep1, Exp Exponent, mp::Ratio Ratio, typename Rep2>
quantity<dimension<exp_invert_t<Exponent>>, std::common_type_t<Rep1, Rep2>, Ratio>
template<typename Rep1, Exponent E, mp::Ratio R, typename Rep2>
quantity<dimension<exp_invert_t<E>>, std::common_type_t<Rep1, Rep2>, R>
constexpr operator/(const Rep1& v,
const quantity<dimension<Exponent>, Rep2, Ratio>& q)
const quantity<dimension<E>, Rep2, R>& q)
{
using ret = quantity<dimension<exp_invert_t<Exponent>>, std::common_type_t<Rep1, Rep2>, Ratio>;
using den = quantity<dimension<Exponent>, std::common_type_t<Rep1, Rep2>, Ratio>;
using ret = quantity<dimension<exp_invert_t<E>>, std::common_type_t<Rep1, Rep2>, R>;
using den = quantity<dimension<E>, std::common_type_t<Rep1, Rep2>, R>;
return ret(v / den(q).count());
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio, typename Rep2>
quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>
constexpr operator/(const quantity<Dimension, Rep1, Ratio>& q,
template<Dimension D, typename Rep1, mp::Ratio R, typename Rep2>
quantity<D, std::common_type_t<Rep1, Rep2>, R>
constexpr operator/(const quantity<D, Rep1, R>& q,
const Rep2& v)
{
using ret = quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>;
using ret = quantity<D, std::common_type_t<Rep1, Rep2>, R>;
return ret(ret(q).count() / v);
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
std::common_type_t<Rep1, Rep2>
constexpr operator/(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
constexpr operator/(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using cq = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using cq = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return cq(lhs).count() / cq(rhs).count();
}
template<Dimension Dimension1, typename Rep1, mp::Ratio Ratio1, Dimension Dimension2, typename Rep2, mp::Ratio Ratio2>
requires treat_as_floating_point_v<std::common_type_t<Rep1, Rep2>> || std::ratio_divide<Ratio1, Ratio2>::den == 1
quantity<dimension_divide_t<Dimension1, Dimension2>, std::common_type_t<Rep1, Rep2>, std::ratio_divide<Ratio1, Ratio2>>
constexpr operator/(const quantity<Dimension1, Rep1, Ratio1>& lhs,
const quantity<Dimension2, Rep2, Ratio2>& rhs)
template<Dimension D1, typename Rep1, mp::Ratio R1, Dimension D2, typename Rep2, mp::Ratio R2>
requires treat_as_floating_point_v<std::common_type_t<Rep1, Rep2>> || std::ratio_divide<R1, R2>::den == 1
quantity<dimension_divide_t<D1, D2>, std::common_type_t<Rep1, Rep2>, std::ratio_divide<R1, R2>>
constexpr operator/(const quantity<D1, Rep1, R1>& lhs,
const quantity<D2, Rep2, R2>& rhs)
{
using ret = quantity<dimension_divide_t<Dimension1, Dimension2>, std::common_type_t<Rep1, Rep2>, std::ratio_divide<Ratio1, Ratio2>>;
using ret = quantity<dimension_divide_t<D1, D2>, std::common_type_t<Rep1, Rep2>, std::ratio_divide<R1, R2>>;
return ret(lhs.count() / rhs.count());
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio, typename Rep2>
quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>
constexpr operator%(const quantity<Dimension, Rep1, Ratio>& q,
template<Dimension D, typename Rep1, mp::Ratio R, typename Rep2>
quantity<D, std::common_type_t<Rep1, Rep2>, R>
constexpr operator%(const quantity<D, Rep1, R>& q,
const Rep2& v)
{
using ret = quantity<Dimension, std::common_type_t<Rep1, Rep2>, Ratio>;
using ret = quantity<D, std::common_type_t<Rep1, Rep2>, R>;
return ret(ret(q).count() % v);
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>
constexpr operator%(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>
constexpr operator%(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using ret = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using ret = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return ret(ret(lhs).count() % ret(rhs).count());
}
// clang-format on
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator==(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator==(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using ct = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using ct = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return ct(lhs).count() == ct(rhs).count();
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator!=(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator!=(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
return !(lhs == rhs);
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator<(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator<(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
using ct = std::common_type_t<quantity<Dimension, Rep1, Ratio1>, quantity<Dimension, Rep2, Ratio2>>;
using ct = std::common_type_t<quantity<D, Rep1, R1>, quantity<D, Rep2, R2>>;
return ct(lhs).count() < ct(rhs).count();
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator<=(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator<=(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
return !(rhs < lhs);
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator>(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator>(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
return rhs < lhs;
}
template<Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
constexpr bool operator>=(const quantity<Dimension, Rep1, Ratio1>& lhs,
const quantity<Dimension, Rep2, Ratio2>& rhs)
template<Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
constexpr bool operator>=(const quantity<D, Rep1, R1>& lhs,
const quantity<D, Rep2, R2>& rhs)
{
return !(lhs < rhs);
}
@ -362,10 +362,10 @@ namespace units {
namespace std {
// todo: simplified
template<units::Dimension Dimension, typename Rep1, mp::Ratio Ratio1, typename Rep2, mp::Ratio Ratio2>
struct common_type<units::quantity<Dimension, Rep1, Ratio1>, units::quantity<Dimension, Rep2, Ratio2>> {
template<units::Dimension D, typename Rep1, mp::Ratio R1, typename Rep2, mp::Ratio R2>
struct common_type<units::quantity<D, Rep1, R1>, units::quantity<D, Rep2, R2>> {
using type =
units::quantity<Dimension, std::common_type_t<Rep1, Rep2>, mp::common_ratio_t<Ratio1, Ratio2>>;
units::quantity<D, std::common_type_t<Rep1, Rep2>, mp::common_ratio_t<R1, R2>>;
};
} // namespace std

2
test/test_quantity.cpp
View File

@ -22,7 +22,7 @@
#include "units/si/velocity.h"
#include <utility>
#include <chrono>
using namespace units;
using namespace units::literals;