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dimension_sqrt and dimension_pow support added

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Mateusz Pusz
2019-09-18 15:32:22 -06:00
parent 36fd4ba97a
commit 021df4a46f
2 changed files with 28 additions and 1 deletions
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26
src/include/units/dimension.h
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@@ -130,7 +130,11 @@ namespace std::experimental::units {
template<Exponent E, int Num, int Den>
struct exp_multiply {
using type = exp<typename E::dimension, E::num * Num, E::den * Den>;
// todo: provide custom implementation for ratio_add
using r1 = std::ratio<E::num, E::den>;
using r2 = std::ratio<Num, Den>;
using r = std::ratio_multiply<r1, r2>;
using type = exp<typename E::dimension, r::num, r::den>;
};
template<Exponent E, int Num, int Den>
@@ -257,4 +261,24 @@ namespace std::experimental::units {
template<Dimension D1, Dimension D2>
using dimension_divide_t = dimension_divide<typename D1::base_type, typename D2::base_type>::type;
// dimension_sqrt
template<Dimension D>
struct dimension_sqrt;
template<typename... Es>
struct dimension_sqrt<dimension<Es...>> : std::type_identity<downcasting_traits_t<dimension<exp_multiply_t<Es, 1, 2>...>>> {};
template<Dimension D>
using dimension_sqrt_t = dimension_sqrt<typename D::base_type>::type;
// dimension_pow
template<Dimension D, std::size_t N>
struct dimension_pow;
template<typename... Es, std::size_t N>
struct dimension_pow<dimension<Es...>, N> : std::type_identity<downcasting_traits_t<dimension<exp_multiply_t<Es, N, 1>...>>> {};
template<Dimension D, std::size_t N>
using dimension_pow_t = dimension_pow<typename D::base_type, N>::type;
} // namespace std::experimental::units

3
test/unit_test/test_custom_units.cpp
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@@ -90,6 +90,9 @@ template<> struct downcasting_traits<downcast_from<volt_per_sqrt_hertz>> : downc
namespace {
static_assert(std::is_same_v<dimension_sqrt_t<power_spectral_density>, amplitude_spectral_density>);
static_assert(std::is_same_v<dimension_pow_t<amplitude_spectral_density, 2>, power_spectral_density>);
//static_assert(sqrt(quantity<sq_volt_per_hertz>(4)) = quantity<volt_per_sqrt_hertz>(2));
}