...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::impl::count_impl
// In header: <boost/accumulators/statistics/count.hpp> struct count_impl { // types typedef std::size_t result_type; // construct/copy/destruct count_impl(dont_care); // public member functions void operator()(dont_care) ; result_type result(dont_care) const; };