build: core library and each system separated to dedicated CMake targets

Refers to #249

src/core/include/units/bits/equivalent.h

@@ -0,0 +1,112 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/bits/basic_concepts.h>
+#include <units/unit.h>
+
+namespace units {
+
+namespace detail {
+
+template<typename T, typename U>
+struct equivalent_impl : std::false_type {
+};
+
+template<typename T>
+struct equivalent_impl<T, T> : std::true_type {
+};
+
+
+// units
+
+template<Unit U1, Unit U2>
+struct equivalent_impl<U1, U2> : std::disjunction<std::is_base_of<U1, U2>, std::is_base_of<U2, U1>> {};
+
+
+// dimensions
+
+template<BaseDimension D1, BaseDimension D2>
+struct equivalent_impl<D1, D2> : std::conjunction<std::bool_constant<D1::symbol == D2::symbol>,
+                     same_unit_reference<typename D1::base_unit, typename D2::base_unit>> {
+};
+
+template<Exponent E1, Exponent E2>
+struct equivalent_exp : std::false_type {
+};
+
+template<BaseDimension Dim1, std::intmax_t Num, std::intmax_t Den, BaseDimension Dim2>
+struct equivalent_exp<exponent<Dim1, Num, Den>, exponent<Dim2, Num, Den>> : equivalent_impl<Dim1, Dim2> {
+};
+
+template<DerivedDimension D1, DerivedDimension D2>
+struct equivalent_derived_dim : std::false_type {
+};
+
+template<typename... Es1, typename... Es2>
+  requires(sizeof...(Es1) == sizeof...(Es2))
+struct equivalent_derived_dim<derived_dimension_base<Es1...>, derived_dimension_base<Es2...>> :
+    std::conjunction<equivalent_exp<Es1, Es2>...> {
+};
+
+template<DerivedDimension D1, DerivedDimension D2>
+struct equivalent_impl<D1, D2> :
+    std::disjunction<std::is_base_of<D1, D2>, std::is_base_of<D2, D1>,
+                     equivalent_derived_dim<downcast_base_t<D1>, downcast_base_t<D2>>> {
+};
+
+
+// additionally accounts for unknown dimensions
+template<Unit U1, Dimension D1, Unit U2, Dimension D2>
+struct equivalent_unit : std::disjunction<equivalent_impl<U1, U2>,
+                                          std::bool_constant<U1::ratio / dimension_unit<D1>::ratio == U2::ratio / dimension_unit<D2>::ratio>> {};
+
+
+// (point) kinds
+
+template<typename T, typename U>
+  requires (Kind<T> && Kind<U>) || (PointKind<T> && PointKind<U>)
+struct equivalent_impl<T, U> :
+  std::conjunction<std::is_same<typename T::base_kind, typename U::base_kind>,
+                   equivalent_impl<typename T::dimension, typename U::dimension>> {};
+
+
+// quantities, quantity points, quantity (point) kinds
+
+template<typename Q1, typename Q2>
+  requires (Quantity<Q1> && Quantity<Q2>) || (QuantityPoint<Q1> && QuantityPoint<Q2>)
+struct equivalent_impl<Q1, Q2> : std::conjunction<equivalent_impl<typename Q1::dimension, typename Q2::dimension>,
+                                                                  equivalent_unit<typename Q1::unit, typename Q1::dimension,
+                                                                                  typename Q2::unit, typename Q2::dimension>> {};
+
+template<typename QK1, typename QK2>
+  requires (QuantityKind<QK1> && QuantityKind<QK2>) || (QuantityPointKind<QK1> && QuantityPointKind<QK2>)
+struct equivalent_impl<QK1, QK2> : std::conjunction<equivalent_impl<typename QK1::kind_type, typename QK2::kind_type>,
+                                                    equivalent_impl<typename QK1::quantity_type, typename QK2::quantity_type>> {};
+
+}  // namespace detail
+
+template<typename T, typename U>
+inline constexpr bool equivalent = detail::equivalent_impl<T, U>::value;
+
+}  // namespace units