...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::feature_of<tag::immediate_mean_of_weights>
// In header: <boost/accumulators/statistics/mean.hpp> struct feature_of<tag::immediate_mean_of_weights> { };