...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::pfr::equal_to — std::equal_to like comparator that returns boost::pfr::eq (x, y)
// In header: <boost/pfr/functors.hpp> template<typename T = void> struct equal_to { // public member functions bool operator()(const T &, const T &) const; };