...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::log::attribute_value_ordering::l2_visitor
// In header: <boost/log/utility/record_ordering.hpp> template<typename LeftT> struct l2_visitor { // types typedef void result_type; // construct/copy/destruct l2_visitor(FunT const &, LeftT const &, bool &); // public member functions template<typename RightT> result_type operator()(RightT const &) const; };