C++ 参考手册
- C++11
- C++14
- C++17
- C++20
- C++ 编译器支持情况表
- 独立与宿主实现
- C++ 语言
- C++ 关键词
- 预处理器
- C++ 标准库头文件
- 具名要求
- 功能特性测试 (C++20)
- 工具库
- 类型支持（基本类型、RTTI、类型特性）
- 概念库 (C++20)
- 错误处理
- 动态内存管理
- 日期和时间工具
- 字符串库
- 容器库
- std::array
- std::vector
- std::map
- std::unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::operator[]
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::get_allocator
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin, std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::empty
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::end, std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cend
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::~unordered_map
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::operator=
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::clear
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::insert
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::insert_or_assign
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::emplace
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::emplace_hint
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::try_emplace
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::erase
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::swap
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::extract
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::merge
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::at
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::find
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::contains
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::equal_range
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin(size_type)
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::end(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cend(size_type)
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket_count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_bucket_count
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket_size
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::bucket
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::load_factor
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::max_load_factor
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::rehash
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::reserve
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::hash_function
- std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::key_eq
- operator==,!=(std::unordered_map)
- std::swap(std::unordered_map)
- std::erase_if (std::unordered_map)
- std::unordered_map 的推导指引
- std::priority_queue
- std::span
- std::forward_list
- std::deque
- std::list
- std::set
- std::multiset
- std::multimap
- std::unordered_set
- std::unordered_multiset
- std::unordered_multimap
- std::stack
- std::queue
- std::vector<bool>
- 结点把柄 (C++17)
- 注释
- 迭代器库
- 范围库 (C++20)
- 算法库
- 数值库
- 输入/输出库
- 文件系统库
- 本地化库
- 正则表达式库
- 原子操作库
- 线程支持库
- 实验性 C++ 特性
- 有用的资源
- 索引
- std 符号索引
- 协程支持 (C++20)
- C++ 关键词
位置：首页 > C++ 参考手册 >容器库 >std::unordered_map > std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin(size_type)
std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::begin(size_type), std::unordered_map<Key,T,Hash,KeyEqual,Allocator>::cbegin(size_type)
| local_iterator begin( size_type n ); |
(C++11 起) | |
| const_local_iterator begin( size_type n ) const; |
(C++11 起) | |
| const_local_iterator cbegin( size_type n ) const; |
(C++11 起) | |
返回指向下标为 n 的桶首元素的迭代器。
参数
| n | - | 要访问的桶的下标 |
返回值
指向首元素的迭代器。
复杂度
常数。
参阅
| 返回一个迭代器，指向指定的桶的末尾 (公开成员函数) |