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xo-unit: + Quantity.rescale()

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Roland Conybeare 2024-04-24 11:31:10 -04:00
commit 8ec337c589
1 changed files with 15 additions and 0 deletions
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15
include/xo/unit/Quantity.hpp
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@ -45,6 +45,21 @@ namespace xo {
constexpr Quantity unit_qty() const { return Quantity(1, unit_); } constexpr Quantity unit_qty() const { return Quantity(1, unit_); }
constexpr Quantity reciprocal() const { return Quantity(1.0 / scale_, unit_.reciprocal()); } constexpr Quantity reciprocal() const { return Quantity(1.0 / scale_, unit_.reciprocal()); }
constexpr
auto rescale(const natural_unit<Int> & unit2) const {
/* conversion factor from .unit -> unit2*/
auto rr = detail::nu_ratio(this->unit_, unit2);
if (rr.natural_unit_.is_dimensionless()) {
repr_type r_scale = (::sqrt(rr.outer_scale_sq_)
* rr.outer_scale_exact_.template to<repr_type>()
* this->scale_);
return Quantity(r_scale, unit2);
} else {
return Quantity(std::numeric_limits<repr_type>::quiet_NaN(), unit2);
}
}
template <typename Quantity2> template <typename Quantity2>
static constexpr static constexpr
auto multiply(const Quantity & x, const Quantity2 & y) { auto multiply(const Quantity & x, const Quantity2 & y) {