...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 — check that a type is a quantity of the specified dimension
// In header: <boost/units/is_quantity_of_dimension.hpp> template<typename T, typename Dim> struct is_quantity_of_dimension { };