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xo-unit: quantity refactoring

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This commit is contained in:
Roland Conybeare 2024-05-23 15:01:56 -04:00
commit b2d7bf93d2
3 changed files with 52 additions and 46 deletions
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6
docs/install.rst
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@ -65,11 +65,7 @@ Installing from source
----------------------
Install scripts for `xo-unit`, `xo-ratio` and `xo-flatstring` depend on shared cmake macros
and a bootstrap script `xo-cmake-config`.
* `xo-cmake`_ source
.. _xo-cmake: https://github.com/rconybea/xo-cmake
and a bootstrap script `xo-cmake-config` fro `xo-cmake`.
Preamble:

53
include/xo/unit/quantity.hpp
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@ -264,8 +264,23 @@ namespace xo {
return *this;
}
// operator*=
// operator/=
/** multiply @p y in-place. y must be dimensionless **/
template <typename Dimensionless>
requires std::is_arithmetic_v<Dimensionless>
constexpr
quantity & operator*=(Dimensionless y) {
this->scale_ *= y;
return *this;
}
/** divide @p y in-place. y must be dimensionless **/
template <typename Dimensionless>
requires std::is_arithmetic_v<Dimensionless>
constexpr
quantity & operator/=(Dimensionless y) {
this->scale_ /= y;
return *this;
}
///@}
@ -634,6 +649,40 @@ namespace xo {
return detail::quantity_util::subtract(x, y);
}
/** 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- (const Quantity & x, Dimensionless y)
{
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;
}
/** 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- (Dimensionless x, const Quantity & 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;
}
///@}
namespace qty {

39
include/xo/unit/quantity_ops.hpp
View file

@ -9,45 +9,6 @@
namespace xo {
namespace qty {
/** @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- (const Quantity & x, Dimensionless y)
{
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;
}
/** 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- (Dimensionless x, const Quantity & 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>