...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::value
// In header: <boost/accumulators/framework/accumulators/value_accumulator.hpp> template<typename ValueType, typename Tag> struct value : public boost::accumulators::depends_on<> { };