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feat: units now allow inheritance

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For example to define `cgs::second` based on `si::second`
This commit is contained in:
Mateusz Pusz
2022-12-04 15:04:37 +01:00
parent 91f26759d6
commit d9b227ad30
1 changed files with 40 additions and 10 deletions
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50
src/core/include/units/unit.h
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@@ -528,8 +528,7 @@ template<Magnitude M, Unit U>
return scaled_unit<mag, U>{};
}
template<Magnitude M, Unit U>
[[nodiscard]] consteval Unit auto operator*(U, M) = delete;
[[nodiscard]] consteval Unit auto operator*(Unit auto, Magnitude auto) = delete;
/**
* `scaled_unit` specializations have priority in this operation. This means that the library framework
@@ -567,22 +566,53 @@ template<Unit Lhs, Unit Rhs>
return detail::expr_divide<derived_unit, struct one, detail::type_list_of_unit_less>(lhs, rhs);
}
template<Unit U>
[[nodiscard]] consteval Unit auto operator/(int value, U u)
[[nodiscard]] consteval Unit auto operator/(int value, Unit auto u)
{
gsl_Expects(value == 1);
return detail::expr_invert<derived_unit, struct one>(u);
}
template<Unit U>
[[nodiscard]] consteval Unit auto operator/(U, int) = delete;
[[nodiscard]] consteval Unit auto operator/(Unit auto, int) = delete;
template<Unit Lhs, Unit Rhs>
[[nodiscard]] consteval bool operator==(Lhs lhs, Rhs rhs)
namespace detail {
consteval bool same_canonical_reference_unit(...) { return false; }
template<basic_symbol_text Symbol, auto... D>
consteval bool same_canonical_reference_unit(const named_unit<Symbol, D...>&, const named_unit<Symbol, D...>&)
{
return true;
}
template<typename F1, typename F2, auto... Vs>
consteval bool same_canonical_reference_unit(const power<F1, Vs...>&, const power<F2, Vs...>&)
{
return same_canonical_reference_unit(F1{}, F2{});
}
template<typename... Us1, typename... Us2>
requires(sizeof...(Us1) == sizeof...(Us2))
consteval bool same_canonical_reference_unit(const type_list<Us1...>&, const type_list<Us2...>&)
{
return (... && same_canonical_reference_unit(Us1{}, Us2{}));
}
template<typename... Us1, typename... Us2>
consteval bool same_canonical_reference_unit(const derived_unit<Us1...>&, const derived_unit<Us2...>&)
{
return same_canonical_reference_unit(typename derived_unit<Us1...>::_num_{},
typename derived_unit<Us2...>::_num_{}) &&
same_canonical_reference_unit(typename derived_unit<Us1...>::_den_{}, typename derived_unit<Us2...>::_den_{});
}
} // namespace detail
[[nodiscard]] consteval bool operator==(Unit auto lhs, Unit auto rhs)
{
auto canonical_lhs = detail::get_canonical_unit(lhs);
auto canonical_rhs = detail::get_canonical_unit(rhs);
return is_same_v<decltype(canonical_lhs.reference_unit), decltype(canonical_rhs.reference_unit)> &&
return detail::same_canonical_reference_unit(canonical_lhs.reference_unit, canonical_rhs.reference_unit) &&
canonical_lhs.mag == canonical_rhs.mag;
}
@@ -591,7 +621,7 @@ template<Unit Lhs, Unit Rhs>
{
auto canonical_lhs = detail::get_canonical_unit(u1);
auto canonical_rhs = detail::get_canonical_unit(u2);
return is_same_v<decltype(canonical_lhs.reference_unit), decltype(canonical_rhs.reference_unit)>;
return detail::same_canonical_reference_unit(canonical_lhs.reference_unit, canonical_rhs.reference_unit);
}
// Common unit