refactor: get_associated_quantity.h moved to a dedicated header file

src/core/CMakeLists.txt

@@ -43,6 +43,7 @@ add_library(
     include/mp_units/bits/algorithm.h
     include/mp_units/bits/dimension_concepts.h
     include/mp_units/bits/expression_template.h
+    include/mp_units/bits/get_associated_quantity.h
     include/mp_units/bits/magnitude.h
     include/mp_units/bits/math_concepts.h
     include/mp_units/bits/prime.h

src/core/include/mp_units/bits/get_associated_quantity.h

@@ -0,0 +1,54 @@
+// 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 <mp_units/bits/expression_template.h>
+#include <mp_units/bits/unit_concepts.h>
+#include <mp_units/quantity_spec.h>
+
+namespace mp_units::detail {
+
+template<typename U, auto... Vs>
+[[nodiscard]] consteval auto get_associated_quantity(power<U, Vs...>)
+{
+  return pow<Vs...>(get_associated_quantity(U{}));
+}
+
+template<typename... Us>
+[[nodiscard]] consteval auto get_associated_quantity(type_list<Us...>)
+{
+  return (dimensionless * ... * get_associated_quantity(Us{}));
+}
+
+template<AssociatedUnit U>
+[[nodiscard]] consteval auto get_associated_quantity(U)
+{
+  if constexpr (requires { U::reference_unit; })
+    return get_associated_quantity(U::reference_unit);
+  else if constexpr (requires { typename U::_num_; })
+    return get_associated_quantity(typename U::_num_{}) / get_associated_quantity(typename U::_den_{});
+  else if constexpr (requires { U::quantity_spec; })
+    return U::quantity_spec;
+}
+
+}  // namespace mp_units::detail

src/core/include/mp_units/reference.h

@@ -22,43 +22,13 @@
 
 #pragma once
 
+#include <mp_units/bits/get_associated_quantity.h>
 #include <mp_units/bits/quantity_concepts.h>
 #include <mp_units/bits/reference_concepts.h>
 #include <mp_units/bits/representation_concepts.h>
-#include <mp_units/quantity_spec.h>
 
 namespace mp_units {
 
-namespace detail {
-
-template<AssociatedUnit U>
-[[nodiscard]] consteval auto get_associated_quantity(U);
-
-template<typename U, auto... Vs>
-[[nodiscard]] consteval auto get_associated_quantity(power<U, Vs...>)
-{
-  return get_associated_quantity(U{});
-}
-
-template<typename... Us>
-[[nodiscard]] consteval auto get_associated_quantity(type_list<Us...>)
-{
-  return (dimensionless * ... * get_associated_quantity(Us{}));
-}
-
-template<AssociatedUnit U>
-[[nodiscard]] consteval auto get_associated_quantity(U)
-{
-  if constexpr (requires { U::reference_unit; })
-    return get_associated_quantity(U::reference_unit);
-  else if constexpr (requires { typename U::_num_; })
-    return get_associated_quantity(typename U::_num_{}) / get_associated_quantity(typename U::_den_{});
-  else if constexpr (requires { U::base_quantity; })
-    return U::base_quantity;
-}
-
-}  // namespace detail
-
 [[nodiscard]] consteval QuantitySpec auto get_quantity_spec(AssociatedUnit auto u)
 {
   return detail::get_associated_quantity(u);
@@ -78,7 +48,6 @@ template<auto Q, auto U>
   return U;
 }
 
-
 template<Reference auto R, RepresentationOf<get_quantity_spec(R).character> Rep>
 class quantity;