Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2018. The current version is 1.89.0.
boost::units::reduce_unit — Returns a unique type for every unit.
// In header: <boost/units/reduce_unit.hpp> template<typename Unit> struct reduce_unit { // types typedef unspecified type; };