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.

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.

Nov 29, 2021 · // Define a const == operator for the class/struct and specialize std::hash // structure in the std namespace std::unordered_map<Foo, std::string> m7 = { {Foo (1), "One"}, …

Nov 5, 2023 · std::unordered_set<Key,Hash,KeyEqual,Allocator>:: contains < cpp ‎ | container ‎ | unordered set C++ ... Containers library

May 9, 2025 · The value_type must be EmplaceConstructible into unordered_set from std::forward<K>(obj). This overload participates in overload resolution only if Hash and …

Nov 29, 2021 · std::unordered_set<Key,Hash,KeyEqual,Allocator>:: find < cpp ‎ | container ‎ | unordered set C++ ... Containers library

Nov 21, 2021 · std::unordered_set<Key,Hash,KeyEqual,Allocator>:: unordered_set C++ Containers library

Nov 27, 2023 · Classes unordered_set (C++11) collection of unique keys, hashed by keys (class template) [edit] unordered_multiset (C++11) collection of keys, hashed by keys (class …

Dec 4, 2021 · If value_type is not EmplaceConstructible into unordered_map from args, the behavior is undefined. If after the operation the new number of elements is greater than old …

Dec 4, 2021 · #include <unordered_map>#include <iostream>int(){std::unordered_map<intstd::string>={{1"one"}{2"two"}{3"three"}{4"four"}{5"five"}{6"six"}};// …