...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::dimensionless_unit — Utility class to simplify construction of dimensionless units in a system.
// In header: <boost/units/dimensionless_unit.hpp> template<typename System> struct dimensionless_unit { // types typedef unit< dimensionless_type, System > type; };