Function operator<

src/fl/stl/flat_set.h:339–343

template <typename Key, typename Less>
bool operator<(const flat_set<Key, Less>& lhs,
               const flat_set<Key, Less>& rhs) {
    return fl::lexicographical_compare(lhs.begin(), lhs.end(),
                                       rhs.begin(), rhs.end());
}

template <typename Key, typename Less>
bool operator<=(const flat_set<Key, Less>& lhs,