...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::impl::lazy_weighted_variance_impl — Lazy calculation of variance of weighted samples.
// In header: <boost/accumulators/statistics/weighted_variance.hpp> template<typename Sample, typename Weight, typename MeanFeature> struct lazy_weighted_variance_impl : public accumulator_base { // types typedef numeric::functional::multiplies< Sample, Weight >::result_type weighted_sample; typedef numeric::functional::fdiv< weighted_sample, Weight >::result_type result_type; // construct/copy/destruct lazy_weighted_variance_impl(dont_care); // public member functions template<typename Args> result_type result(Args const &) const; };