unordered_map<int,char>example{{1,'a'},{2,'b'}};if(autosearch=example.find(2);search!=example.end())std::cout<<"Found "<<search->first<<' '<<search->second<<'\n';elsestd::cout<<"Not found\n";// C++20 demo: Heterogeneous lookup for unordered containers (transparent hashing)...
unordered_map::operator[] unordered_map::count unordered_map::find unordered_map::contains (C++20) unordered_map::equal_range Bucket interface unordered_map::begin(size_type)unordered_map::cbegin(size_type) unordered_map::end(size_type)unordered_map::cend(size_type) ...
unordered_map<Key, T, Hash, Pred, polymorphic_allocator<pair<const Key, T>>>; template<class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>> using unordered_multimap = std:: unordered_multimap<Key, T, Hash, Pred, polymorphic_allocator<pair<const Key, T>>>; } ...
#include <iostream>#include <string>#include <unordered_map>intmain(){std::unordered_map<int,std::string>dict={{1,"one"},{2,"two"}};dict.insert({3,"three"});dict.insert(std::make_pair(4,"four"));dict.insert({{4,"another four"},{5,"five"}});constboolok=dict.insert({1,...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...
C++ Library - <unordered_map> C++ Library - <unordered_set> C++ Library - <vector> C++ Library - <algorithm> C++ Library - <iterator> The C++ Advanced Library C++ Library - <any> C++ Library - <barrier> C++ Library - <bit> C++ Library - <chrono> C++ Library - <cinttypes> C++ Libr...
unordered_map::operator[] unordered_map::count unordered_map::find unordered_map::contains (C++20) unordered_map::equal_range Bucket interface unordered_map::begin(size_type)unordered_map::cbegin(size_type) unordered_map::end(size_type)unordered_map::cend(size_type) ...
unordered_map::operator[] unordered_map::count unordered_map::find unordered_map::contains (C++20) unordered_map::equal_range Bucket interface unordered_map::begin(size_type)unordered_map::cbegin(size_type) unordered_map::end(size_type)unordered_map::cend(size_type) ...
unordered_multimap 创建账户 std::unordered_multimap 在标头<unordered_map>定义 template< classKey, classT, classHash=std::hash<Key>, classKeyEqual=std::equal_to<Key>, classAllocator=std::allocator<std::pair<constKey, T>> >classunordered_multimap;...
__cpp_lib_unordered_map_try_emplace std::unordered_map::try_emplace、std::unordered_map::insert_or_assign 201411L (C++17) N4279 __cpp_lib_unreachable std::unreachable 202202L (C++23) P0627R6 __cpp_lib_unwrap_ref std::unwrap_ref_decay 和std::unwrap_reference 201811L (C++20) P...