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 · std::unordered_map<Key,T,Hash,KeyEqual,Allocator>:: unordered_map C++ Containers library std::unordered_map

Nov 21, 2021 · unordered_set(std::initializer_list<value_type> init, size_type bucket_count, const Allocator & alloc ) : unordered_set ( init, bucket_count, Hash(), key_equal(), alloc){} (14) (since …

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 · Simple comparison demo: Found 2 Heterogeneous lookup for unordered containers (transparent hashing): std::size_t string_hash::operator () (const char*) const true …

Nov 5, 2023 · #include <iostream>#include <unordered_set>int(){std::unordered_set<int>{1234};for(int:{25})if(contains())std::cout<<<<": …

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 …

Apr 26, 2025 · std::unordered_multimap is an unordered associative container that supports equivalent keys (an unordered_multimap may contain multiple copies of each key value) and …

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"}};// …