...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::units::is_quantity_of_dimension<quantity< Unit, Y >, Dim>
// In header: <boost/units/is_quantity_of_dimension.hpp> template<typename Unit, typename Y, typename Dim> struct is_quantity_of_dimension<quantity< Unit, Y >, Dim> : public boost::units::is_unit_of_dimension< Unit, Dim > { };