...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::value< ValueType, Tag >>
template<typename ValueType, typename Tag> struct feature_of<tag::value< ValueType, Tag >> : public boost::accumulators::feature_of< Feature > { };