forked from mpusz/mp-units
Mateusz Pusz
00d863508d
- now stores dimension's symbol rather than its name - temperature and current renamed to exactly match their names in SI
188 lines
4.7 KiB
C++
188 lines
4.7 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#pragma once
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#include <units/bits/external/downcasting.h>
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#include <units/bits/external/fixed_string.h>
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#include <units/bits/external/hacks.h>
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#include <units/bits/external/numeric_concepts.h>
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#include <units/bits/external/type_traits.h>
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#include <units/customization_points.h>
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namespace units {
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namespace detail {
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template<typename T, typename U = T>
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concept basic_arithmetic = // exposition only
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std::magma<std::ranges::plus, T, U> &&
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std::magma<std::ranges::minus, T, U> &&
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std::magma<std::ranges::times, T, U> &&
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std::magma<std::ranges::divided_by, T, U>;
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} // namespace detail
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// PrefixType
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struct prefix_type;
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template<typename T>
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concept PrefixType = std::derived_from<T, prefix_type>;
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// Prefix
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// TODO gcc:92150
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92150
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// namespace detail {
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// template<typename T>
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// inline constexpr bool is_prefix = false;
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// template<typename PrefixType, Ratio R, basic_fixed_string Symbol>
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// inline constexpr bool is_prefix<prefix<PrefixType, R, Symbol>> = true;
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// } // namespace detail
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template<typename T>
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// concept Prefix = detail::is_prefix<T>;
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concept Prefix = true;
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namespace detail {
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template<typename T>
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inline constexpr bool is_ratio = false;
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} // namespace detail
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template<typename T>
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concept Ratio = detail::is_ratio<T>;
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// UnitRatio
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template<typename R>
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concept UnitRatio = Ratio<R> && (R::num * R::den > 0);
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// Unit
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template<UnitRatio R, typename U>
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struct scaled_unit;
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template<typename T>
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concept Unit = is_derived_from_instantiation<T, scaled_unit>;
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// BaseDimension
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template<basic_fixed_string Symbol, Unit U>
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requires U::is_named
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struct base_dimension;
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namespace detail {
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#if __GNUC__ == 9 && __GNUC_MINOR__ < 2
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template<typename T>
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inline constexpr bool is_base_dimension = true;
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#else
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template<typename T>
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inline constexpr bool is_base_dimension = false;
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template<basic_fixed_string Name, typename... Params>
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inline constexpr bool is_base_dimension<base_dimension<Name, Params...>> = true;
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#endif
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} // namespace detail
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template<typename T>
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concept BaseDimension = detail::is_base_dimension<typename T::base_type_workaround>;
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// Exponent
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namespace detail {
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template<typename T>
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inline constexpr bool is_exp = false;
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} // namespace detail
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template<typename T>
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concept Exponent = detail::is_exp<T>;
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// DerivedDimension
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namespace detail {
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template<Exponent E, Exponent... ERest>
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requires (BaseDimension<typename E::dimension> && ... && BaseDimension<typename ERest::dimension>)
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struct derived_dimension_base;
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} // namespace detail
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template<typename T>
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concept DerivedDimension = is_instantiation<downcast_base_t<T>, detail::derived_dimension_base>;
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// Dimension
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template<typename T>
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concept Dimension = BaseDimension<T> || DerivedDimension<T>;
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// UnitOf
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namespace detail {
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template<Dimension D>
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struct dimension_unit_impl;
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template<BaseDimension D>
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struct dimension_unit_impl<D> {
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using type = D::base_unit;
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};
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template<DerivedDimension D>
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struct dimension_unit_impl<D> {
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using type = D::coherent_unit;
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};
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} // namespace detail
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template<Dimension D>
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using dimension_unit = detail::dimension_unit_impl<D>::type;
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template<typename U, typename D>
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concept UnitOf =
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Unit<U> &&
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Dimension<D> &&
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std::same_as<typename U::reference, typename dimension_unit<D>::reference>;
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// Quantity
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namespace detail {
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template<typename T>
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inline constexpr bool is_quantity = false;
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} // namespace detail
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template<typename T>
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concept Quantity = detail::is_quantity<T>;
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// Scalar
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template<typename T>
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concept Scalar = (!Quantity<T>) && std::regular<T> && std::totally_ordered<T> && detail::basic_arithmetic<T>;
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} // namespace units
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