...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::numeric::functional::average<Left, Right, std_vector_tag, void>
// In header: <boost/accumulators/numeric/functional/vector.hpp> template<typename Left, typename Right> struct average<Left, Right, std_vector_tag, void> { };