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This is an older version of Boost and was released in 2022. The current version is 1.89.0.
boost::accumulators::impl::immediate_weighted_mean_impl
// In header: <boost/accumulators/statistics_fwd.hpp> template<typename Sample, typename Weight, typename Tag> struct immediate_weighted_mean_impl : public accumulator_base { // construct/copy/destruct template<typename Args> immediate_weighted_mean_impl(Args const &); // public member functions template<typename Args> void operator()(Args const &); result_type result(dont_care) const; template<typename Archive> void serialize(Archive &, const unsigned int); };