...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_covariance
// In header: <boost/accumulators/statistics/weighted_covariance.hpp> template<typename VariateType, typename VariateTag> struct weighted_covariance : public boost::accumulators::depends_on< count, sum_of_weights, weighted_mean, weighted_mean_of_variates< VariateType, VariateTag > > { // types typedef accumulators::impl::weighted_covariance_impl< mpl::_1, mpl::_2, VariateType, VariateTag > impl; };