...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::sum_of_weights
// In header: <boost/accumulators/statistics/sum.hpp> struct sum_of_weights : public boost::accumulators::depends_on<> { // types typedef mpl::true_ is_weight_accumulator; };