[flat.map.defn]

namespace std { template<class Key, class T, class Compare = less<Key>, class KeyContainer = vector<Key>, class MappedContainer = vector<T>> class flat_map { public: // types using key_type = Key; using mapped_type = T; using value_type = pair<key_type, mapped_type>; using key_compare = Compare; using reference = pair<const key_type&, mapped_type&>; using const_reference = pair<const key_type&, const mapped_type&>; using size_type = size_t; using difference_type = ptrdiff_t; using iterator = implementation-defined; // see [container.requirements] using const_iterator = implementation-defined; // see [container.requirements] using reverse_iterator = std::reverse_iterator<iterator>; using const_reverse_iterator = std::reverse_iterator<const_iterator>; using key_container_type = KeyContainer; using mapped_container_type = MappedContainer; class value_compare { private: key_compare comp; // exposition only value_compare(key_compare c) : comp(c) { } // exposition only public: bool operator()(const_reference x, const_reference y) const { return comp(x.first, y.first); } }; struct containers { key_container_type keys; mapped_container_type values; }; // [flat.map.cons], construct/copy/destroy flat_map() : flat_map(key_compare()) { } flat_map(key_container_type key_cont, mapped_container_type mapped_cont, const key_compare& comp = key_compare()); template<class Allocator> flat_map(const key_container_type& key_cont, const mapped_container_type& mapped_cont, const Allocator& a); template<class Allocator> flat_map(const key_container_type& key_cont, const mapped_container_type& mapped_cont, const key_compare& comp, const Allocator& a); flat_map(sorted_unique_t, key_container_type key_cont, mapped_container_type mapped_cont, const key_compare& comp = key_compare()); template<class Allocator> flat_map(sorted_unique_t, const key_container_type& key_cont, const mapped_container_type& mapped_cont, const Allocator& a); template<class Allocator> flat_map(sorted_unique_t, const key_container_type& key_cont, const mapped_container_type& mapped_cont, const key_compare& comp, const Allocator& a); explicit flat_map(const key_compare& comp) : c(), compare(comp) { } template<class Allocator> flat_map(const key_compare& comp, const Allocator& a); template<class Allocator> explicit flat_map(const Allocator& a); template<class InputIterator> flat_map(InputIterator first, InputIterator last, const key_compare& comp = key_compare()) : c(), compare(comp) { insert(first, last); } template<class InputIterator, class Allocator> flat_map(InputIterator first, InputIterator last, const key_compare& comp, const Allocator& a); template<class InputIterator, class Allocator> flat_map(InputIterator first, InputIterator last, const Allocator& a); template<container-compatible-range<value_type> R> flat_map(from_range_t fr, R&& rg) : flat_map(fr, std::forward<R>(rg), key_compare()) { } template<container-compatible-range<value_type> R, class Allocator> flat_map(from_range_t, R&& rg, const Allocator& a); template<container-compatible-range<value_type> R> flat_map(from_range_t, R&& rg, const key_compare& comp) : flat_map(comp) { insert_range(std::forward<R>(rg)); } template<container-compatible-range<value_type> R, class Allocator> flat_map(from_range_t, R&& rg, const key_compare& comp, const Allocator& a); template<class InputIterator> flat_map(sorted_unique_t s, InputIterator first, InputIterator last, const key_compare& comp = key_compare()) : c(), compare(comp) { insert(s, first, last); } template<class InputIterator, class Allocator> flat_map(sorted_unique_t, InputIterator first, InputIterator last, const key_compare& comp, const Allocator& a); template<class InputIterator, class Allocator> flat_map(sorted_unique_t, InputIterator first, InputIterator last, const Allocator& a); flat_map(initializer_list<value_type> il, const key_compare& comp = key_compare()) : flat_map(il.begin(), il.end(), comp) { } template<class Allocator> flat_map(initializer_list<value_type> il, const key_compare& comp, const Allocator& a); template<class Allocator> flat_map(initializer_list<value_type> il, const Allocator& a); flat_map(sorted_unique_t s, initializer_list<value_type> il, const key_compare& comp = key_compare()) : flat_map(s, il.begin(), il.end(), comp) { } template<class Allocator> flat_map(sorted_unique_t, initializer_list<value_type> il, const key_compare& comp, const Allocator& a); template<class Allocator> flat_map(sorted_unique_t, initializer_list<value_type> il, const Allocator& a); flat_map& operator=(initializer_list<value_type> il); // iterators iterator begin() noexcept; const_iterator begin() const noexcept; iterator end() noexcept; const_iterator end() const noexcept; reverse_iterator rbegin() noexcept; const_reverse_iterator rbegin() const noexcept; reverse_iterator rend() noexcept; const_reverse_iterator rend() const noexcept; const_iterator cbegin() const noexcept; const_iterator cend() const noexcept; const_reverse_iterator crbegin() const noexcept; const_reverse_iterator crend() const noexcept; // [flat.map.capacity], capacity [[nodiscard]] bool empty() const noexcept; size_type size() const noexcept; size_type max_size() const noexcept; // [flat.map.access], element access mapped_type& operator[](const key_type& x); mapped_type& operator[](key_type&& x); template<class K> mapped_type& operator[](K&& x); mapped_type& at(const key_type& x); const mapped_type& at(const key_type& x) const; template<class K> mapped_type& at(const K& x); template<class K> const mapped_type& at(const K& x) const; // [flat.map.modifiers], modifiers template<class... Args> pair<iterator, bool> emplace(Args&&... args); template<class... Args> iterator emplace_hint(const_iterator position, Args&&... args); pair<iterator, bool> insert(const value_type& x) { return emplace(x); } pair<iterator, bool> insert(value_type&& x) { return emplace(std::move(x)); } iterator insert(const_iterator position, const value_type& x) { return emplace_hint(position, x); } iterator insert(const_iterator position, value_type&& x) { return emplace_hint(position, std::move(x)); } template<class P> pair<iterator, bool> insert(P&& x); template<class P> iterator insert(const_iterator position, P&&); template<class InputIterator> void insert(InputIterator first, InputIterator last); template<class InputIterator> void insert(sorted_unique_t, InputIterator first, InputIterator last); template<container-compatible-range<value_type> R> void insert_range(R&& rg); void insert(initializer_list<value_type> il) { insert(il.begin(), il.end()); } void insert(sorted_unique_t s, initializer_list<value_type> il) { insert(s, il.begin(), il.end()); } containers extract() &&; void replace(key_container_type&& key_cont, mapped_container_type&& mapped_cont); template<class... Args> pair<iterator, bool> try_emplace(const key_type& k, Args&&... args); template<class... Args> pair<iterator, bool> try_emplace(key_type&& k, Args&&... args); template<class K, class... Args> pair<iterator, bool> try_emplace(K&& k, Args&&... args); template<class... Args> iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); template<class... Args> iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args); template<class K, class... Args> iterator try_emplace(const_iterator hint, K&& k, Args&&... args); template<class M> pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj); template<class M> pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj); template<class K, class M> pair<iterator, bool> insert_or_assign(K&& k, M&& obj); template<class M> iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj); template<class M> iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj); template<class K, class M> iterator insert_or_assign(const_iterator hint, K&& k, M&& obj); iterator erase(iterator position); iterator erase(const_iterator position); size_type erase(const key_type& x); template<class K> size_type erase(K&& x); iterator erase(const_iterator first, const_iterator last); void swap(flat_map& y) noexcept; void clear() noexcept; // observers key_compare key_comp() const; value_compare value_comp() const; const key_container_type& keys() const noexcept { return c.keys; } const mapped_container_type& values() const noexcept { return c.values; } // map operations iterator find(const key_type& x); const_iterator find(const key_type& x) const; template<class K> iterator find(const K& x); template<class K> const_iterator find(const K& x) const; size_type count(const key_type& x) const; template<class K> size_type count(const K& x) const; bool contains(const key_type& x) const; template<class K> bool contains(const K& x) const; iterator lower_bound(const key_type& x); const_iterator lower_bound(const key_type& x) const; template<class K> iterator lower_bound(const K& x); template<class K> const_iterator lower_bound(const K& x) const; iterator upper_bound(const key_type& x); const_iterator upper_bound(const key_type& x) const; template<class K> iterator upper_bound(const K& x); template<class K> const_iterator upper_bound(const K& x) const; pair<iterator, iterator> equal_range(const key_type& x); pair<const_iterator, const_iterator> equal_range(const key_type& x) const; template<class K> pair<iterator, iterator> equal_range(const K& x); template<class K> pair<const_iterator, const_iterator> equal_range(const K& x) const; friend bool operator==(const flat_map& x, const flat_map& y); friend synth-three-way-result<value_type> operator<=>(const flat_map& x, const flat_map& y); friend void swap(flat_map& x, flat_map& y) noexcept { x.swap(y); } private: containers c; // exposition only key_compare compare; // exposition only struct key_equiv { // exposition only key_equiv(key_compare c) : comp(c) { } bool operator()(const_reference x, const_reference y) const { return !comp(x.first, y.first) && !comp(y.first, x.first); } key_compare comp; }; }; template<class KeyContainer, class MappedContainer, class Compare = less<typename KeyContainer::value_type>> flat_map(KeyContainer, MappedContainer, Compare = Compare()) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Allocator> flat_map(KeyContainer, MappedContainer, Allocator) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, less<typename KeyContainer::value_type>, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare, class Allocator> flat_map(KeyContainer, MappedContainer, Compare, Allocator) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare = less<typename KeyContainer::value_type>> flat_map(sorted_unique_t, KeyContainer, MappedContainer, Compare = Compare()) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, Compare, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Allocator> flat_map(sorted_unique_t, KeyContainer, MappedContainer, Allocator) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, less<typename KeyContainer::value_type>, KeyContainer, MappedContainer>; template<class KeyContainer, class MappedContainer, class Compare, class Allocator> flat_map(sorted_unique_t, KeyContainer, MappedContainer, Compare, Allocator) -> flat_map<typename KeyContainer::value_type, typename MappedContainer::value_type, Compare, KeyContainer, MappedContainer>; template<class InputIterator, class Compare = less<iter-key-type<InputIterator>>> flat_map(InputIterator, InputIterator, Compare = Compare()) -> flat_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>, Compare>; template<class InputIterator, class Compare = less<iter-key-type<InputIterator>>> flat_map(sorted_unique_t, InputIterator, InputIterator, Compare = Compare()) -> flat_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>, Compare>; template<ranges::input_range R, class Compare = less<range-key-type<R>>, class Allocator = allocator<byte>> flat_map(from_range_t, R&&, Compare = Compare(), Allocator = Allocator()) -> flat_map<range-key-type<R>, range-mapped-type<R>, Compare, vector<range-key-type<R>, alloc-rebind<Allocator, range-key-type<R>>>, vector<range-mapped-type<R>, alloc-rebind<Allocator, range-mapped-type<R>>>>; template<ranges::input_range R, class Allocator> flat_map(from_range_t, R&&, Allocator) -> flat_map<range-key-type<R>, range-mapped-type<R>, less<range-key-type<R>>, vector<range-key-type<R>, alloc-rebind<Allocator, range-key-type<R>>>, vector<range-mapped-type<R>, alloc-rebind<Allocator, range-mapped-type<R>>>>; template<class Key, class T, class Compare = less<Key>> flat_map(initializer_list<pair<Key, T>>, Compare = Compare()) -> flat_map<Key, T, Compare>; template<class Key, class T, class Compare = less<Key>> flat_map(sorted_unique_t, initializer_list<pair<Key, T>>, Compare = Compare()) -> flat_map<Key, T, Compare>; template<class Key, class T, class Compare, class KeyContainer, class MappedContainer, class Allocator> struct uses_allocator<flat_map<Key, T, Compare, KeyContainer, MappedContainer>, Allocator> : bool_constant<uses_allocator_v<KeyContainer, Allocator> && uses_allocator_v<MappedContainer, Allocator>> { }; }

24 Containers library [containers]

24.6 Container adaptors [container.adaptors]

24.6.9 Class template flat_map [flat.map]

24.6.9.2 Definition [flat.map.defn]