...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::intrusive::priority_compare<void>
// In header: <boost/intrusive/priority_compare.hpp> struct priority_compare<void> { // public member functions template<typename T, typename U> bool operator()(const T &, const U &) const; };