...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_base<Left, Right, typename enable_if< are_integral< Left, Right > >::type>
// In header: <boost/accumulators/numeric/functional.hpp> template<typename Left, typename Right> struct average_base<Left, Right, typename enable_if< are_integral< Left, Right > >::type> : public boost::numeric::functional::divides< double const, double const > { };