...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::as_feature<tag::mean_of_weights(immediate)>
struct as_feature<tag::mean_of_weights(immediate)> { // types typedef tag::immediate_mean_of_weights type; };