...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::accumulators::tag::weighted_moment
// In header: <boost/accumulators/statistics/weighted_moment.hpp> template<int N> struct weighted_moment : public boost::accumulators::depends_on< count, sum_of_weights > { };