...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_mean_of_variates
template<typename VariateType, typename VariateTag> struct weighted_mean_of_variates : public boost::accumulators::depends_on< Feature1, Feature2, > { };