serif::dimensions::Dimensionless serif::dimensions::PhysicalQuantity dimensions.hpp std::string_view std::string_view serif::dimensions::Dimensionless::identifier identifier serif::dimensions::Dimensionless::identifier = "dimensionless" Non dimensional type. serif::dimensions::Dimensionless serif::dimensions::PhysicalQuantity serif::dimensions::Dimensionless identifier serif::dimensions::PhysicalQuantity std::basic_string_view< Char > std::string_view serif::dimensions::Dimensionlessidentifier