...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::amount_base_dimension — base dimension of amount
// In header: <boost/units/physical_dimensions/amount.hpp> struct amount_base_dimension : public boost::units::base_dimension< amount_base_dimension,-4 > { };