...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::feature_of<tag::reference< ValueType, Tag >>
// In header: <boost/accumulators/framework/accumulators/reference_accumulator.hpp> template<typename ValueType, typename Tag> struct feature_of<tag::reference< ValueType, Tag >> : public boost::accumulators::feature_of< tag::reference_tag< Tag > > { };