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xo-unit: + Quantity<=>Quantity, Quantity==Quantity

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Roland Conybeare 2024-04-24 11:35:25 -04:00
commit 382ceb8803
1 changed files with 20 additions and 0 deletions
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include/xo/unit/Quantity.hpp
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@ -280,6 +280,26 @@ namespace xo {
return Quantity::subtract(x, y);
}
/** note: won't have constexpr result until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Quantity, typename Quantity2>
requires quantity2_concept<Quantity> && quantity2_concept<Quantity2>
constexpr auto
operator== (const Quantity & x, const Quantity2 & y)
{
return (Quantity::compare(x, y) == 0);
}
/** note: won't have constexpr result until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Quantity, typename Quantity2>
requires quantity2_concept<Quantity> && quantity2_concept<Quantity2>
constexpr auto
operator<=> (const Quantity & x, const Quantity2 & y)
{
return Quantity::compare(x, y);
}
namespace unit {
constexpr auto nanogram = natural_unit_qty(nu2::nanogram);
}