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 1.90.0.
boost::units::dimensionless_type — Dimension lists in which all exponents resolve to zero reduce to dimensionless_type.
// In header: <boost/units/dimensionless_type.hpp> struct dimensionless_type { // types typedef dimensionless_type type; typedef unspecified tag; typedef mpl::long_< 0 > size; };