unordered associative container
group of class templates in the C++ Standard Library that implement hash table variants: std::unordered_set, std::unordered_map, std::unordered_multiset, std::unordered_multimap
group of class templates in the C++ Standard Library that implement hash table variants: std::unordered_set, std::unordered_map, std::unordered_multiset, std::unordered_multimap