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 2013. The current version is 1.89.0.
boost::units::pow
// In header: <boost/units/cmath.hpp> template<typename S, typename Y> quantity< BOOST_UNITS_DIMENSIONLESS_UNIT(S), Y > pow(const quantity< BOOST_UNITS_DIMENSIONLESS_UNIT(S), Y > & q1, const quantity< BOOST_UNITS_DIMENSIONLESS_UNIT(S), Y > & q2);