...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_dimensionless<quantity< Unit, Y >> — check if a quantity is dimensionless
// In header: <boost/units/is_dimensionless.hpp> template<typename Unit, typename Y> struct is_dimensionless<quantity< Unit, Y >> : public boost::units::is_dimensionless< Unit > { };