...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::less_equal — std::less_equal like comparator that returns boost::pfr::le (x, y)
// In header: <boost/pfr/functors.hpp> template<typename T = void> struct less_equal { // public member functions bool operator()(const T &, const T &) const; };