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xo-unit: + with_repr() convenience for xo::qty::quantity

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This commit is contained in:
Roland Conybeare 2024-05-03 21:34:55 -04:00
commit 633c037ba3
1 changed files with 16 additions and 1 deletions
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17
include/xo/unit/quantity.hpp
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@ -44,6 +44,12 @@ namespace xo {
// zero_qty
// reciprocal
template <typename Repr2>
constexpr
auto with_repr() const {
return quantity<Repr2, ratio_int_type, s_unit, ratio_int2x_type>(scale_);
}
/* parallel implementation to Quantity<Repr, Int>::rescale(),
* except that NaturalUnit2 is a compile-time-only template-argument
*
@ -142,7 +148,7 @@ namespace xo {
requires(quantity_concept<Q2>
&& Q2::always_constexpr_unit)
constexpr operator Q2() const {
return this->template rescale<Q2::s_unit>();
return this->template rescale<Q2::s_unit>().template with_repr<typename Q2::repr_type>();
}
public: /* need public members so that a quantity instance can be a non-type template parameter (is a structural type) */
@ -236,6 +242,15 @@ namespace xo {
return x.template rescale<Unit>();
}
template <typename Repr2, typename Q1>
requires (quantity_concept<Q1>
&& Q1::always_constexpr_unit)
constexpr auto
with_repr(const Q1 & x)
{
return x.template with_repr<Repr2>();
}
/** note: won't have constexpr result w/ fractional dimension until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Q1, typename Q2>