refactor: 💥 is_XXX customization points for representation types removed

example/include/ranged_representation.h

@@ -62,9 +62,6 @@ public:
   }
 };
 
-template<typename T, auto Min, auto Max>
-constexpr bool mp_units::is_scalar<ranged_representation<T, Min, Max>> = mp_units::is_scalar<T>;
-
 template<typename T, auto Min, auto Max, typename Char>
 struct MP_UNITS_STD_FMT::formatter<ranged_representation<T, Min, Max>, Char> : formatter<T, Char> {
   template<typename FormatContext>

example/include/validated_type.h

@@ -113,9 +113,6 @@ public:
   = default;
 };
 
-template<typename T, typename Validator>
-constexpr bool mp_units::is_scalar<validated_type<T, Validator>> = mp_units::is_scalar<T>;
-
 
 template<typename CharT, typename Traits, typename T, typename Validator>
 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,

example/kalman_filter/kalman_filter-example_2.cpp

@@ -38,10 +38,6 @@ import mp_units;
 
 // Based on: https://www.kalmanfilter.net/alphabeta.html#ex2
 
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 using namespace mp_units;
 
 void print_header(const kalman::SystemState auto& initial)

example/kalman_filter/kalman_filter-example_3.cpp

@@ -38,10 +38,6 @@ import mp_units;
 
 // Based on: https://www.kalmanfilter.net/alphabeta.html#ex3
 
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 using namespace mp_units;
 
 void print_header(const kalman::SystemState auto& initial)

example/kalman_filter/kalman_filter-example_4.cpp

@@ -38,10 +38,6 @@ import mp_units;
 
 // Based on: https://www.kalmanfilter.net/alphabeta.html#ex4
 
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 using namespace mp_units;
 
 void print_header(const kalman::SystemState auto& initial)

example/measurement.cpp

@@ -124,6 +124,13 @@ public:
     return os << v.value() << " ± " << v.uncertainty();
   }
 
+  [[nodiscard]] friend constexpr measurement abs(const measurement& v)
+    requires requires { abs(v.value()); } || requires { std::abs(v.value()); }
+  {
+    using std::abs;
+    return measurement(abs(v.value()), v.uncertainty());
+  }
+
 private:
   value_type value_{};
   value_type uncertainty_{};
@@ -131,12 +138,8 @@ private:
 
 }  // namespace
 
-template<typename T>
-constexpr bool mp_units::is_scalar<measurement<T>> = true;
-template<typename T>
-constexpr bool mp_units::is_vector<measurement<T>> = true;
-
 static_assert(mp_units::RepresentationOf<measurement<double>, mp_units::quantity_character::scalar>);
+static_assert(mp_units::RepresentationOf<measurement<double>, mp_units::quantity_character::vector>);
 
 namespace {
 

example/storage_tank.cpp

@@ -40,12 +40,6 @@ import mp_units;
 #include <mp-units/systems/si.h>
 #endif
 
-// allows standard gravity (acceleration) and weight (force) to be expressed with scalar representation
-// types instead of requiring the usage of Linear Algebra library for this simple example
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 namespace {
 
 using namespace mp_units;

example/strong_angular_quantities.cpp

@@ -33,10 +33,6 @@ import mp_units;
 #include <mp-units/systems/si.h>
 #endif
 
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 int main()
 {
   using namespace mp_units;

example/total_energy.cpp

@@ -37,10 +37,6 @@ import mp_units;
 #include <mp-units/systems/si.h>
 #endif
 
-template<class T>
-  requires mp_units::is_scalar<T>
-constexpr bool mp_units::is_vector<T> = true;
-
 namespace {
 
 using namespace mp_units;