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Ratio maths fixed

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Mateusz Pusz
2020-09-02 21:30:04 +02:00
parent 5c98924efb
commit 72ed03fbf9
3 changed files with 15 additions and 6 deletions
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src/include/units/bits/common_quantity.h
+5 -1
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@@ -52,7 +52,11 @@ struct common_quantity_impl<quantity<D1, U1, Rep1>, quantity<D2, U2, Rep2>, Rep>
template<typename D1, typename U1, typename Rep1, typename D2, typename U2, typename Rep2, typename Rep>
struct common_quantity_impl<quantity<D1, U1, Rep1>, quantity<D2, U2, Rep2>, Rep> {
using dimension = conditional<is_instantiation_of<D1, unknown_dimension>, D2, D1>;
using type = quantity<dimension, downcast_unit<dimension, common_ratio(U1::ratio, U2::ratio)>, Rep>;
static constexpr ratio r1 = D1::base_units_ratio * U1::ratio;
static constexpr ratio r2 = D2::base_units_ratio * U2::ratio;
static constexpr ratio cr = common_ratio(r1, r2);
using unit = downcast_unit<dimension, cr / dimension::base_units_ratio>;
using type = quantity<dimension, unit, Rep>;
};
template<typename D, typename U, typename Rep>
src/include/units/quantity_cast.h
+8 -1
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@@ -313,7 +313,14 @@ struct quantity_cast_impl<To, CRatio, CRep, false, true, false> {
template<typename Q1, typename Q2>
constexpr ratio cast_ratio(const Q1& from, const Q2& to)
{
return quantity_ratio(from) / quantity_ratio(to);
using FromU = Q1::unit;
using ToU = Q2::unit;
if constexpr(same_unit_reference<FromU, ToU>::value) {
return FromU::ratio / ToU::ratio;
}
else {
return quantity_ratio(from) / quantity_ratio(to);
}
}
} // namespace detail