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xo-unit: operator<=> for (xquantity, double) pairs

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Roland Conybeare 2024-05-01 14:30:51 -04:00
commit 6a949d16c5
1 changed files with 20 additions and 0 deletions
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20
include/xo/unit/xquantity.hpp
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@ -401,6 +401,26 @@ namespace xo {
return Quantity::compare(x, y);
}
/** note: won't have constexpr result until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Quantity, double>
requires quantity2_concept<Quantity>
constexpr auto
operator<=> (const Quantity & x, double y)
{
return Quantity::compare(x, Quantity(y, nu::dimensionless));
}
/** note: won't have constexpr result until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Quantity, double>
requires quantity2_concept<Quantity>
constexpr auto
operator<=> (double x, const Quantity & y)
{
return Quantity::compare(Quantity(x, nu::dimensionless), y);
}
namespace unit {
constexpr auto nanogram = natural_unit_qty(nu::nanogram);
}