...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::tag<std::vector< T, Al >>
// In header: <boost/accumulators/numeric/functional/vector.hpp> template<typename T, typename Al> struct tag<std::vector< T, Al >> { // types typedef std_vector_tag type; };