roland/xo-alloc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

xo-unit ++ docs ++ quantity arithmetic + example

Browse source
This commit is contained in:
Roland Conybeare 2024-05-23 14:44:00 -04:00
commit b0ce5eaee9
34 changed files with 713 additions and 173 deletions
Download patch file Download diff file Expand all files Collapse all files

41
include/xo/unit/quantity_ops.hpp
View file

@ -9,24 +9,45 @@
namespace xo {
namespace qty {
/** note: does not require unit scaling, so constexpr with c++23 **/
template <typename Dimensionless, typename Quantity>
requires std::is_arithmetic_v<Dimensionless> && quantity_concept<Quantity>
/** @defgroup quantity-dimensionless-operators **/
///@{
/** subtract an arithmetic value from a dimensionless quantity **/
template <typename Quantity,
typename Dimensionless>
requires (quantity_concept<Quantity>
&& Quantity::is_dimensionless()
&& std::is_arithmetic_v<Dimensionless>)
constexpr auto
operator* (Dimensionless x, const Quantity & y)
operator- (const Quantity & x, Dimensionless y)
{
return y.scale_by(x);
using repr_type = std::common_type_t<typename Quantity::repr_type, Dimensionless>;
auto xp = static_cast<repr_type>(x.scale());
auto yp = static_cast<repr_type>(y);
return xp - yp;
}
/** note: does not require unit scaling, so constexpr with c++23 **/
template <typename Dimensionless, typename Quantity>
requires std::is_arithmetic_v<Dimensionless> && quantity_concept<Quantity>
/** subtract a dimensionless quantity from an arithmetic value **/
template <typename Dimensionless,
typename Quantity>
requires (std::is_arithmetic_v<Dimensionless>
&& quantity_concept<Quantity>
&& Quantity::is_dimensionless())
constexpr auto
operator* (const Quantity & x, Dimensionless y)
operator- (Dimensionless x, const Quantity & y)
{
return x.scale_by(y);
using repr_type = std::common_type_t<Dimensionless, typename Quantity::repr_type>;
auto xp = static_cast<repr_type>(x);
auto yp = static_cast<repr_type>(y.scale());
return xp - yp;
}
///@}
/** note: won't have constexpr result until c++26 (when ::sqrt(), ::pow() are constexpr)
**/
template <typename Quantity, typename Quantity2>