44 template <typename Key, typename T>
47   using value_type = std::pair<const Key, T>;
49   using node_type = std::pair<Key, T>;
101   const_iterator find(const Key& key) const {  in find()
106   iterator find(const Key& key) {  in find()
115   bool contains(const Key& key) const {  in contains()
123   std::pair<iterator, bool> try_emplace(const_iterator pos, const Key& key, Args&&... args) {  in try_emplace()
137   std::pair<iterator, bool> try_emplace_back(const Key& key, Args&&... args) {  in try_emplace_back()
143   void insert_or_assign(const_iterator pos, const Key& key, T value) {  in insert_or_assign()
154   void insert_or_assign(const Key& key, T value) {  in insert_or_assign()
162   void splice(const_iterator pos, ListMap<Key, T>& other, const_iterator it) {  in splice()  argument
172   std::optional<node_type> extract(const Key& key) {  in extract()
216   std::unordered_map<Key, iterator> key_map_;