std:: unordered_map - cppreference.com
Apr 26, 2025 · std::unordered_map is an associative container that contains key-value pairs with unique keys. Search, insertion, and removal of elements have average constant-time complexity.
std:: unordered_set - cppreference.com
Apr 26, 2025 · std::unordered_set is an associative container that contains a set of unique objects of type Key. Search, insertion, and removal have average constant-time complexity.
std::unordered_map<Key,T,Hash,KeyEqual,Allocator>:: …
Nov 29, 2021 · Define a const == operator for the class/struct and specialize std::hash// structure in the std namespacestd::unordered_map<std::string>={{(1)"One"}{2"Two"}{3"Three"}};// …
Standard library header <unordered_set> (C++11) - Reference
Nov 27, 2023 · unordered_multiset (unordered_multiset &&); explicit unordered_multiset (const Allocator &); unordered_multiset (const unordered_multiset &, const type_identity_t …
std::unordered_multiset<Key,Hash,KeyEqual,Allocator>:: insert
(C++20) unordered_multiset::equal_range Bucket interface unordered_multiset::begin(size_type)unordered_multiset::cbegin(size_type) …
std::unordered_multiset<Key,Hash,KeyEqual,Allocator>::operator ...
constructs the unordered_multiset(public member function) [edit] Retrieved from " https://en.cppreference.com/mwiki/index.php?title=cpp/container/unordered_multiset/operator%3D&oldid=135867 "
std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::~unordered ...
unordered_multimap::load_factor unordered_multimap::max_load_factor unordered_multimap::rehash unordered_multimap::reserve Observers …
std::unordered_set<Key,Hash,KeyEqual,Allocator>:: insert_range
Aug 7, 2023 · (C++20) unordered_set::equal_range Bucket interface unordered_set::begin(size_type)unordered_set::cbegin(size_type) …
std::unordered_map<Key,T,Hash,KeyEqual,Allocator>:: merge
Nov 29, 2021 · unordered_map::merge (C++17) unordered_map::insert unordered_map::insert_range (C++23) unordered_map::insert_or_assign (C++17) …
deduction guides for std::unordered_set - cppreference.com
1-6) These deduction guides are provided for unordered_set to allow deduction from an iterator range (overloads (1,3,4)) and std::initializer_list (overloads (2,5,6)).