refactor: units nearly done
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Mateusz Pusz committed
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@@ -38,50 +38,12 @@
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namespace units {
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// namespace detail {
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// template<typename>
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// inline constexpr bool can_be_prefixed = false;
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// } // namespace detail
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/**
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* @brief A common point for a hierarchy of units
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*
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* A unit is an entity defined and adopted by convention, with which any other quantity of
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* the same kind can be compared to express the ratio of the second quantity to the first
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* one as a number.
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*
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* All units of the same dimension can be convereted between each other. To allow this all of
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* them are expressed as different ratios of the same one proprietary chosen reference unit
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* (i.e. all length units are expressed in terms of meter, all mass units are expressed in
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* terms of gram, ...)
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*
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* @tparam M a Magnitude representing the (relative) size of this unit
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* @tparam U a unit to use as a reference for this dimension
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*
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* @note U cannot be constrained with Unit as for some specializations (i.e. named_unit)
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* it gets the incomplete child's type with the CRTP idiom.
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*/
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template<Magnitude auto M, typename U>
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struct scaled_unit {
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static constexpr UNITS_MSVC_WORKAROUND(Magnitude) auto mag = M;
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using reference = U;
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};
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// TODO: Remove when P1985 accepted
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namespace detail {
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template<Magnitude auto M, typename U>
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void to_base_scaled_unit(const volatile scaled_unit<M, U>*);
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template<typename T>
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inline constexpr bool is_specialization_of_scaled_unit = false;
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inline constexpr bool is_unit = false;
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template<Magnitude auto M, typename U>
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inline constexpr bool is_specialization_of_scaled_unit<scaled_unit<M, U>> = true;
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} // namespace detail
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}
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/**
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* @brief A concept matching all unit types in the library
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@@ -89,129 +51,12 @@ inline constexpr bool is_specialization_of_scaled_unit<scaled_unit<M, U>> = true
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* Satisfied by all unit types derived from an specialization of :class:`scaled_unit`.
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*/
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template<typename T>
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concept Unit = requires(T* t) { detail::to_base_scaled_unit(t); };
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namespace detail {
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template<typename>
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inline constexpr bool is_named = false;
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}
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template<typename T>
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concept NamedUnit = Unit<T> && detail::is_named<T>;
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template<Unit auto U1, Unit auto U2>
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struct same_unit_reference : is_same<typename decltype(U1)::reference, typename decltype(U2)::reference> {};
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namespace detail {
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template<Unit U1, Unit U2>
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struct unit_less : std::bool_constant<type_name<U1>() < type_name<U2>()> {};
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template<typename T1, typename T2>
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using type_list_of_unit_less = expr_less<T1, T2, unit_less>;
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/**
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* @brief Unpacks the list of potentially derived dimensions to a list containing only base dimensions
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*
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* @tparam Es Exponents of potentially derived dimensions
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*/
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// template<typename NumList, typename DenList>
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// struct unit_extract;
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// template<>
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// struct unit_extract<type_list<>, type_list<>> {
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// using num = type_list<>;
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// using den = type_list<>;
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// };
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// template<typename T, typename... NRest, typename... Dens>
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// requires BaseUnit<T> || BaseUnit<typename T::factor>
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// struct unit_extract<type_list<T, NRest...>, type_list<Dens...>> {
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// using impl = unit_extract<type_list<NRest...>, type_list<Dens...>>;
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// using num = type_list_push_front<typename impl::num, T>;
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// using den = TYPENAME impl::den;
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// };
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// template<typename T, typename... DRest>
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// requires BaseUnit<T> || BaseUnit<typename T::factor>
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// struct unit_extract<type_list<>, type_list<T, DRest...>> {
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// using impl = unit_extract<type_list<>, type_list<DRest...>>;
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// using num = TYPENAME impl::num;
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// using den = type_list_push_front<typename impl::den, T>;
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// };
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// template<DerivedUnit T, typename... NRest, typename... Dens>
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// struct unit_extract<type_list<T, NRest...>, type_list<Dens...>> :
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// unit_extract<type_list_push_back<typename T::normalized_num, NRest...>,
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// type_list_push_back<typename T::normalized_den, Dens...>> {};
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// template<DerivedUnit T, int... Ints, typename... NRest, typename... Dens>
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// struct unit_extract<type_list<power<T, Ints...>, NRest...>, type_list<Dens...>> :
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// unit_extract<type_list_push_back<typename expr_power<typename T::normalized_num, power<T, Ints...>::num,
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// power<T, Ints...>::den>::type,
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// NRest...>,
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// type_list_push_back<typename expr_power<typename T::normalized_den, power<T, Ints...>::num,
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// power<T, Ints...>::den>::type,
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// Dens...>> {};
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// template<DerivedUnit T, typename... DRest>
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// struct unit_extract<type_list<>, type_list<T, DRest...>> :
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// unit_extract<typename T::normalized_den, type_list_push_back<typename T::normalized_num, DRest...>> {};
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// template<DerivedUnit T, int... Ints, typename... DRest>
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// struct unit_extract<type_list<>, type_list<power<T, Ints...>, DRest...>> :
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// unit_extract<typename expr_power<typename T::normalized_den, power<T, Ints...>::num, power<T,
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// Ints...>::den>::type,
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// type_list_push_back<typename expr_power<typename T::normalized_num, power<T, Ints...>::num,
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// power<T, Ints...>::den>::type,
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// DRest...>> {};
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/**
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* @brief Converts user provided derived dimension specification into a valid units::normalized_dimension definition
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*
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* User provided definition of a derived dimension may contain the same base dimension repeated more than once on the
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* list possibly hidden in other derived units provided by the user. The process here should:
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* 1. Extract derived dimensions into exponents of base dimensions.
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* 2. Sort the exponents so the same dimensions are placed next to each other.
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* 3. Consolidate contiguous range of exponents of the same base dimensions to a one (or possibly zero) exponent for
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* this base dimension.
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*/
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template<typename OneTypeBase, typename... Us>
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struct normalized_unit : detail::expr_fractions<OneTypeBase, Us...> {
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// private:
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// using base = detail::expr_fractions<OneTypeBase, Us...>;
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// using extracted = unit_extract<typename base::num, typename base::den>;
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// using num_list = expr_consolidate<type_list_sort<typename extracted::num, type_list_of_unit_less>>;
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// using den_list = expr_consolidate<type_list_sort<typename extracted::den, type_list_of_unit_less>>;
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// using simple = expr_simplify<num_list, den_list, type_list_of_unit_less>;
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// public:
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// using normalized_num = TYPENAME simple::num;
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// using normalized_den = TYPENAME simple::den;
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};
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} // namespace detail
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// TODO add checking for `per` and power elements as well
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template<typename T>
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concept UnitSpec = Unit<T> || is_specialization_of<T, per> || detail::is_specialization_of_power<T>;
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concept Unit = detail::is_unit<T>;
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// User should not instantiate this type!!!
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// It should not be exported from the module
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template<UnitSpec... Us>
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struct derived_unit : detail::normalized_unit<derived_unit<>, Us...>, scaled_unit<mag<1>, derived_unit<Us...>> {
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static constexpr bool is_base = false;
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};
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/**
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* @brief Unit one
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*
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* Unit of a dimensionless quantity.
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*/
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inline constexpr struct one : derived_unit<> {
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} one;
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template<Magnitude auto M, Unit U>
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struct scaled_unit {};
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/**
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* @brief A named unit
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@@ -225,85 +70,186 @@ template<basic_symbol_text Symbol, auto...>
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struct named_unit;
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template<basic_symbol_text Symbol>
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struct named_unit<Symbol> : scaled_unit<mag<1>, named_unit<Symbol>> {
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struct named_unit<Symbol> {
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static constexpr auto symbol = Symbol;
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static constexpr bool is_base = true;
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};
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template<basic_symbol_text Symbol, Unit auto U>
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struct named_unit<Symbol, U> : decltype(U) {
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struct named_unit<Symbol, U> {
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static constexpr auto symbol = Symbol;
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static constexpr bool is_base = decltype(U)::is_base;
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};
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namespace detail {
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template<basic_symbol_text Symbol, auto... Args>
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void to_base_specialization_of_named_unit(const volatile named_unit<Symbol, Args...>*);
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} // namespace detail
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template<typename T>
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concept NamedUnit = Unit<T> && requires(T* t) { detail::to_base_specialization_of_named_unit(t); };
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template<Unit auto V>
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inline constexpr bool unit_can_be_prefixed = NamedUnit<std::remove_const_t<decltype(V)>>;
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/**
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* @brief A prefixed unit
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*
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* Defines a new unit that is a scaled version of another unit by the provided prefix. It is
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* only possible to create such a unit if the given prefix type matches the one defined in a
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* reference unit.
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* coherent_unit unit.
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*
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* @tparam Child inherited class type used by the downcasting facility (CRTP Idiom)
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* @tparam P prefix to be appied to the reference unit
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* @tparam U reference unit
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* @tparam P prefix to be appied to the coherent_unit unit
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* @tparam U coherent_unit unit
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*/
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template<basic_symbol_text Symbol, Magnitude auto M, NamedUnit auto U>
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// requires detail::can_be_prefixed<U>
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struct prefixed_unit : scaled_unit<M* decltype(U)::mag, typename decltype(U)::reference> {
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// static constexpr auto symbol = symbol + decltype(U)::symbol;
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static constexpr bool is_base = decltype(U)::is_base;
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requires unit_can_be_prefixed<U>
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struct prefixed_unit : std::remove_const_t<decltype(M * U)> {
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static constexpr auto symbol = Symbol + U.symbol;
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};
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/**
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* @brief A coherent unit of a derived quantity
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*
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* Defines a new coherent unit of a derived quantity. It should be passed as a coherent unit
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* in the dimension's definition for such a quantity.
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*
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* @tparam Child inherited class type used by the downcasting facility (CRTP Idiom)
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*/
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// template<typename Child>
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// struct derived_unit : downcast_dispatch<Child, scaled_unit<mag<1>(), Child>> {};
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namespace detail {
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template<basic_symbol_text Symbol, auto... Args>
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void is_named_impl(const volatile named_unit<Symbol, Args...>*);
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template<typename T>
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inline constexpr bool is_power_of_unit =
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requires { requires is_specialization_of_power<T> && Unit<typename T::factor>; };
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template<basic_symbol_text Symbol, Magnitude auto M, NamedUnit auto U>
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void is_named_impl(const volatile prefixed_unit<Symbol, M, U>*);
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template<typename T>
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concept UnitLike = Unit<T> || is_power_of_unit<T>;
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template<Unit U>
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inline constexpr bool is_named<U> = requires(U * u) { is_named_impl(u); };
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template<typename T>
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inline constexpr bool is_per_of_units = false;
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// template<typename Child, basic_symbol_text Symbol>
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// void can_be_prefixed_impl(const volatile named_unit<Child, Symbol>*);
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// template<typename Child, basic_symbol_text Symbol, Magnitude auto M, typename U>
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// void can_be_prefixed_impl(const volatile named_scaled_unit<Child, Symbol, M, U>*);
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// template<typename U, basic_symbol_text Symbol>
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// void can_be_prefixed_impl(const volatile alias_unit<U, Symbol>*);
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// template<Unit U>
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// inline constexpr bool can_be_prefixed<U> = requires(U * u) { can_be_prefixed_impl(u); };
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// template<Magnitude auto M, typename U>
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// inline constexpr bool can_be_prefixed<scaled_unit<M, U>> = can_be_prefixed<typename U::reference>;
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template<typename... Ts>
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inline constexpr bool is_per_of_units<per<Ts...>> = (... && UnitLike<Ts>);
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} // namespace detail
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template<typename T>
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concept UnitSpec = detail::UnitLike<T> || detail::is_per_of_units<T>;
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// User should not instantiate this type!!!
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// It should not be exported from the module
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template<UnitSpec... Us>
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struct derived_unit : detail::expr_fractions<derived_unit<>, Us...> {};
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/**
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* @brief Unit one
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*
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* Unit of a dimensionless quantity.
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*/
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inline constexpr struct one : derived_unit<> {
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} one;
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namespace detail {
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template<auto M, typename U>
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void is_unit_impl(const volatile scaled_unit<M, U>*);
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template<basic_symbol_text Symbol, auto... Args>
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void is_unit_impl(const volatile named_unit<Symbol, Args...>*);
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template<typename... Us>
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void is_unit_impl(const volatile derived_unit<Us...>*);
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template<typename T>
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requires requires(T* t) { is_unit_impl(t); }
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inline constexpr bool is_unit<T> = true;
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/**
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* @brief A common point for a hierarchy of units
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*
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* A unit is an entity defined and adopted by convention, with which any other quantity of
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* the same kind can be compared to express the ratio of the second quantity to the first
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* one as a number.
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*
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* All units of the same dimension can be convereted between each other. To allow this all of
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* them are expressed as different ratios of the same one proprietary chosen coherent_unit unit
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* (i.e. all length units are expressed in terms of meter, all mass units are expressed in
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* terms of gram, ...)
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*
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* @tparam M a Magnitude representing the (relative) size of this unit
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* @tparam U a unit to use as a coherent_unit for this dimension
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*
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* @note U cannot be constrained with Unit as for some specializations (i.e. named_unit)
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* it gets the incomplete child's type with the CRTP idiom.
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*/
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template<UnitLike U, Magnitude M>
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struct canonical_unit {
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U reference_unit;
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M mag;
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};
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[[nodiscard]] constexpr auto get_canonical_unit(UnitLike auto u);
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template<UnitLike T, auto M, typename U>
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[[nodiscard]] constexpr auto get_canonical_unit_impl(T, const volatile scaled_unit<M, U>&)
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{
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auto base = get_canonical_unit(U{});
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return canonical_unit{base.reference_unit, M * base.mag};
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}
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template<UnitLike T, basic_symbol_text Symbol>
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[[nodiscard]] constexpr auto get_canonical_unit_impl(T t, const volatile named_unit<Symbol>&)
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{
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return canonical_unit{t, mag<1>};
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}
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template<UnitLike T, basic_symbol_text Symbol, Unit auto U>
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[[nodiscard]] constexpr auto get_canonical_unit_impl(T, const volatile named_unit<Symbol, U>&)
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{
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return get_canonical_unit(U);
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}
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template<UnitLike T, typename F, int Num, int... Den>
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[[nodiscard]] constexpr auto get_canonical_unit_impl(T, const volatile power<F, Num, Den...>&)
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{
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auto base = get_canonical_unit(F{});
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return canonical_unit{
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derived_unit<power_or_T<std::remove_const_t<decltype(base.reference_unit)>, power<F, Num, Den...>::exponent>>{},
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pow<power<F, Num, Den...>::exponent>(base.mag)};
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}
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template<UnitLike T, UnitSpec... Us>
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[[nodiscard]] constexpr auto get_canonical_unit_impl(T, const volatile derived_unit<Us...>&)
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{
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if constexpr (type_list_size<typename derived_unit<Us...>::_den_> != 0) {
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auto num = get_canonical_unit(type_list_map<typename derived_unit<Us...>::_num_, derived_unit>{});
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auto den = get_canonical_unit(type_list_map<typename derived_unit<Us...>::_den_, derived_unit>{});
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return canonical_unit{num.reference_unit / den.reference_unit, num.mag / den.mag};
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} else {
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auto num = (one * ... * get_canonical_unit(Us{}).reference_unit);
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auto mag = (units::mag<1> * ... * get_canonical_unit(Us{}).mag);
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return canonical_unit{num, mag};
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}
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}
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[[nodiscard]] constexpr auto get_canonical_unit(UnitLike auto u) { return get_canonical_unit_impl(u, u); }
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template<Unit U1, Unit U2>
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struct unit_less : std::bool_constant<type_name<U1>() < type_name<U2>()> {};
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template<typename T1, typename T2>
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using type_list_of_unit_less = expr_less<T1, T2, unit_less>;
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} // namespace detail
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// Operators
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template<Magnitude M, Unit U>
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[[nodiscard]] consteval Unit auto operator*(M mag, U)
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{
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return scaled_unit<mag, U>{};
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// TODO Try passing magnitude parameters rather than magnitude type itself in case of a trivial magnitude
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// (single integer, ratio...)
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return scaled_unit<mag, std::remove_const_t<U>>{};
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}
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template<Magnitude M1, Magnitude auto M2, typename U>
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[[nodiscard]] consteval Unit auto operator*(M1 mag, scaled_unit<M2, U>)
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{
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return scaled_unit<mag * M2, U>{};
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}
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template<Magnitude M, Unit U>
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[[nodiscard]] consteval Unit auto operator*(U, M) = delete;
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template<Unit U1, Unit U2>
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[[nodiscard]] consteval Unit auto operator*(U1, U2)
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@@ -324,72 +270,46 @@ template<Unit U>
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return detail::expr_invert<U, struct one, derived_unit>();
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}
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template<Unit U>
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[[nodiscard]] consteval Unit auto operator/(U, int) = delete;
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template<Unit U1, Unit U2>
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[[nodiscard]] consteval bool operator==(U1, U2)
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[[nodiscard]] consteval bool operator==(U1 lhs, U2 rhs)
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{
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return is_same_v<U1, U2>;
|
||||
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)> &&
|
||||
canonical_lhs.mag == canonical_rhs.mag;
|
||||
}
|
||||
|
||||
|
||||
// template<BaseDimension D1, BaseDimension D2>
|
||||
// constexpr bool operator==(D1, D2)
|
||||
// {
|
||||
// return D1::symbol == D2::symbol;
|
||||
// }
|
||||
|
||||
// template<BaseDimension D1, Dimension D2>
|
||||
// requires(type_list_size<typename D2::normalized_den> == 0) && (type_list_size<typename D2::normalized_num> == 1) &&
|
||||
// BaseDimension<type_list_front<typename D2::normalized_num>>
|
||||
// constexpr bool operator==(D1, D2)
|
||||
// {
|
||||
// return D1::symbol == type_list_front<typename D2::normalized_num>::symbol;
|
||||
// }
|
||||
|
||||
// template<Dimension D1, BaseDimension D2>
|
||||
// requires(type_list_size<typename D1::normalized_den> == 0) && (type_list_size<typename D1::normalized_num> == 1) &&
|
||||
// BaseDimension<type_list_front<typename D1::normalized_num>>
|
||||
// constexpr bool operator==(D1, D2)
|
||||
// {
|
||||
// return type_list_front<typename D1::normalized_num>::symbol == D2::symbol;
|
||||
// }
|
||||
|
||||
// template<DerivedDimension D1, DerivedDimension D2>
|
||||
// constexpr bool operator==(D1, D2)
|
||||
// {
|
||||
// return std::is_same_v<typename D1::normalized_num, typename D2::normalized_num> &&
|
||||
// std::is_same_v<typename D1::normalized_den, typename D2::normalized_den>;
|
||||
// }
|
||||
|
||||
// TODO implement this
|
||||
// template<Dimension D1, Dimension D2>
|
||||
// [[nodiscard]] consteval bool equivalent(D1, D2)
|
||||
// {
|
||||
// return is_same_v<detail::dim_type<D1>, detail::dim_type<D2>>;
|
||||
// }
|
||||
|
||||
// Convertible
|
||||
template<Unit U1, Unit U2>
|
||||
[[nodiscard]] consteval bool convertible(U1, U2)
|
||||
[[nodiscard]] consteval bool convertible(U1 lhs, U2 rhs)
|
||||
{
|
||||
// TODO implement this
|
||||
return std::derived_from<U1, U2> || std::derived_from<U2, U1>;
|
||||
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)>;
|
||||
}
|
||||
|
||||
// Helper types and variable factories
|
||||
template<Unit U>
|
||||
struct square_ : decltype(U{} * U{}) {};
|
||||
|
||||
template<Unit auto U>
|
||||
inline constexpr square_<std::remove_const_t<decltype(U)>> square;
|
||||
|
||||
template<Unit U>
|
||||
struct cubic_ : decltype(U{} * U{} * U{}) {};
|
||||
|
||||
// it is not allowed to use the same name for a variable and class template
|
||||
// (even though it works for objects of regular class types)
|
||||
template<Unit auto U>
|
||||
inline constexpr square_<std::remove_const_t<decltype(U)>> square;
|
||||
|
||||
template<Unit auto U>
|
||||
inline constexpr cubic_<std::remove_const_t<decltype(U)>> cubic;
|
||||
|
||||
} // namespace units
|
||||
|
||||
namespace std {
|
||||
|
||||
// TODO implement this
|
||||
template<units::Unit U1, units::Unit U2>
|
||||
requires(units::convertible(U1{}, U2{}))
|
||||
|
||||
Reference in new issue
Block a user