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fix: require equal exponent ratios for DimensionOf when UNITS_DOWNCAST OFF

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Johel Ernesto Guerrero Peña
2020-09-09 23:27:37 -04:00
committed by Mateusz Pusz
parent c284b7e25a
commit 4cb1122ff4
1 changed files with 13 additions and 4 deletions
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17
src/include/units/physical/dimensions.h
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@@ -23,23 +23,32 @@
#pragma once
#include <units/base_dimension.h>
#include <units/bits/dimension_op.h>
#include <units/bits/external/type_traits.h>
#include <units/derived_dimension.h>
#include <units/exponent.h>
#include <units/quantity.h>
#include <units/unit.h>
#include <concepts>
namespace units::physical {
namespace detail {
template<template<typename...> typename DimTemplate, typename Child, Unit U, Exponent... Es>
requires requires { typename DimTemplate<Child, U, typename Es::dimension...>; }
void to_base_derived_dimension_of(const volatile derived_dimension<Child, U, Es...>*);
template<typename Dim, template<typename...> typename DimTemplate>
inline constexpr bool same_exponents_of = false;
template<Exponent... Es, template<typename...> typename DimTemplate>
inline constexpr bool same_exponents_of<unknown_dimension<Es...>, DimTemplate> = requires { typename DimTemplate<unknown_dimension<Es...>, unknown_coherent_unit, typename Es::dimension...>; } && std::same_as<exponent_list<Es...>, typename DimTemplate<unknown_dimension<Es...>, unknown_coherent_unit, typename Es::dimension...>::recipe>;
} // namespace detail
template<typename Dim, template<typename...> typename DimTemplate>
concept DimensionOf = Dimension<Dim> && (is_derived_from_specialization_of<Dim, DimTemplate> || requires(const volatile Dim* x) { detail::to_base_derived_dimension_of<DimTemplate>(x); });
concept EquivalentUnknownDimensionOf = Dimension<Dim> && is_derived_from_specialization_of<Dim, unknown_dimension> && detail::same_exponents_of<Dim, DimTemplate>;
template<typename Dim, template<typename...> typename DimTemplate>
concept DimensionOf = Dimension<Dim> && (is_derived_from_specialization_of<Dim, DimTemplate> ||
EquivalentUnknownDimensionOf<Dim, DimTemplate>);
template<typename Q, template<typename...> typename DimTemplate>
concept QuantityOf = Quantity<Q> && DimensionOf<typename Q::dimension, DimTemplate>;