A concept matching all unit types in the library
Declared in <mp-units/framework/unit_concepts.h>
template<typename T>
concept Unit = std::derived_from<T, detail::unit_interface> && detail::SymbolicConstant<T> &&
!is_specialization_of_v<T, named_unit> && !detail::is_specialization_of_prefixed_unit<T>;
Satisfied by all unit types provided by the library.