feat: DerivedQuantitySpecExpr and DerivedUnitExpr removed

src/core/include/mp-units/framework/quantity_spec.h

@@ -429,7 +429,10 @@ struct quantity_spec<Self, QS, Eq, Args...> : detail::quantity_spec_interface<Se
 
 namespace detail {
 
-template<detail::DerivedQuantitySpecExpr... Expr>
+template<typename T>
+struct is_dimensionless : std::false_type {};
+
+template<typename... Expr>
 struct derived_quantity_spec_impl :
 #if MP_UNITS_API_NO_CRTP
     detail::quantity_spec_interface,
@@ -492,7 +495,7 @@ struct derived_quantity_spec_impl :
  * @note User should not instantiate this type! It is not exported from the C++ module. The library will
  *       instantiate this type automatically based on the dimensional arithmetic equation provided by the user.
  */
-template<detail::DerivedQuantitySpecExpr... Expr>
+template<typename... Expr>
 struct derived_quantity_spec final : detail::derived_quantity_spec_impl<Expr...> {};
 
 /**

src/core/include/mp-units/framework/quantity_spec_concepts.h

@@ -76,28 +76,9 @@ template<typename T>
 concept NamedQuantitySpec =
   QuantitySpec<T> && is_derived_from_specialization_of_quantity_spec<T> && (!QuantityKindSpec<T>);
 
-template<typename T>
-struct is_dimensionless : std::false_type {};
-
-template<typename T>
-concept IsPowerOfQuantitySpec = is_specialization_of_power<T> &&
-                                (NamedQuantitySpec<typename T::factor> || is_dimensionless<typename T::factor>::value);
-
-
-template<typename T>
-constexpr bool is_per_of_quantity_specs = false;
-
-template<typename... Ts>
-constexpr bool is_per_of_quantity_specs<per<Ts...>> =
-  (... && (NamedQuantitySpec<Ts> || is_dimensionless<Ts>::value || IsPowerOfQuantitySpec<Ts>));
-
-template<typename T>
-concept DerivedQuantitySpecExpr = detail::NamedQuantitySpec<T> || detail::is_dimensionless<T>::value ||
-                                  detail::IsPowerOfQuantitySpec<T> || detail::is_per_of_quantity_specs<T>;
-
 }  // namespace detail
 
-template<detail::DerivedQuantitySpecExpr... Expr>
+template<typename... Expr>
 struct derived_quantity_spec;
 
 namespace detail {

src/core/include/mp-units/framework/unit.h

@@ -67,7 +67,7 @@ struct scaled_unit_impl;
 template<typename T>
 constexpr bool is_specialization_of_scaled_unit = false;
 
-template<DerivedUnitExpr... Expr>
+template<typename... Expr>
 struct derived_unit_impl;
 
 /**
@@ -461,7 +461,7 @@ namespace detail {
 template<typename T>
 struct is_one : std::false_type {};
 
-template<DerivedUnitExpr... Expr>
+template<typename... Expr>
 struct derived_unit_impl : detail::unit_interface, detail::expr_fractions<detail::is_one, Expr...> {
   using _base_type_ = derived_unit_impl;  // exposition only
 };
@@ -513,7 +513,7 @@ struct derived_unit_impl : detail::unit_interface, detail::expr_fractions<detail
  * @note User should not instantiate this type! It is not exported from the C++ module. The library will
  *       instantiate this type automatically based on the unit arithmetic equation provided by the user.
  */
-template<detail::DerivedUnitExpr... Expr>
+template<typename... Expr>
 struct derived_unit final : detail::derived_unit_impl<Expr...> {};
 
 /**
@@ -831,13 +831,13 @@ constexpr auto unit_symbol_impl(Out out, const power<F, Num, Den...>&, const uni
   return copy_symbol_exponent<CharT, Num, Den...>(fmt.encoding, negative_power, out);
 }
 
-template<typename CharT, std::output_iterator<CharT> Out, DerivedUnitExpr... Us>
+template<typename CharT, std::output_iterator<CharT> Out, typename... Us>
 constexpr Out unit_symbol_impl(Out out, const type_list<>&, const unit_symbol_formatting&, bool)
 {
   return out;
 }
 
-template<typename CharT, std::output_iterator<CharT> Out, DerivedUnitExpr U, DerivedUnitExpr... Rest>
+template<typename CharT, std::output_iterator<CharT> Out, typename U, typename... Rest>
 constexpr Out unit_symbol_impl(Out out, const type_list<U, Rest...>&, const unit_symbol_formatting& fmt,
                                bool negative_power)
 {
@@ -845,7 +845,7 @@ constexpr Out unit_symbol_impl(Out out, const type_list<U, Rest...>&, const unit
           (print_separator<CharT>(out, fmt), out = unit_symbol_impl<CharT>(out, Rest{}, fmt, negative_power)));
 }
 
-template<typename CharT, std::output_iterator<CharT> Out, DerivedUnitExpr... Nums, DerivedUnitExpr... Dens>
+template<typename CharT, std::output_iterator<CharT> Out, typename... Nums, typename... Dens>
 constexpr Out unit_symbol_impl(Out out, const type_list<Nums...>& nums, const type_list<Dens...>& dens,
                                const unit_symbol_formatting& fmt)
 {

src/core/include/mp-units/framework/unit_concepts.h

@@ -60,23 +60,7 @@ MP_UNITS_EXPORT struct one;
 MP_UNITS_EXPORT template<typename T>
 concept PrefixableUnit = Unit<T> && is_derived_from_specialization_of_v<T, named_unit>;
 
-namespace detail {
-
-template<typename T>
-constexpr bool is_power_of_unit = requires { requires is_specialization_of_power<T> && Unit<typename T::factor>; };
-
-template<typename T>
-constexpr bool is_per_of_units = false;
-
-template<typename... Ts>
-constexpr bool is_per_of_units<per<Ts...>> = (... && (Unit<Ts> || is_power_of_unit<Ts>));
-
-template<typename T>
-concept DerivedUnitExpr = Unit<T> || detail::is_power_of_unit<T> || detail::is_per_of_units<T>;
-
-}  // namespace detail
-
-template<detail::DerivedUnitExpr... Expr>
+template<typename... Expr>
 struct derived_unit;
 
 MP_UNITS_EXPORT template<symbol_text Symbol, Magnitude auto M, PrefixableUnit auto U>