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A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
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The number of buckets can be automatically increased by a call to insert, or as the result of calling rehash.
桶的数量可以通过调用 insert 自动增加，或者作为调用 rehash 的结果。
Configuration macros
配置宏
`BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0`
`BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0`
Globally define this macro to support loading of ``unordered_set``s saved to a Boost.Serialization archive with a version of Boost prior to Boost 1.84.
全局定义此宏以支持加载由 Boost 1.84 之前版本的 Boost 保存到 Boost.Serialization 归档中的 `unordered_set`。
Typedefs
类型定义
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A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value_type`。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
Convertible to `const_iterator`.
可转换为 `const++_++iterator` 。
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---
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A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value_type`。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
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---
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An iterator with the same value type, difference type and pointer and reference type as iterator.
一种迭代器，其值类型、差值类型以及指针和引用类型均与 iterator 相同。
A `local_iterator` object can be used to iterate through a single bucket.
`local++_iterator` 对象可用于遍历单个桶内的元素。
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---
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A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
一种常量迭代器，其值类型、差值类型以及指针和引用类型均与 const++_iterator 相同。
A const_local_iterator object can be used to iterate through a single bucket.
`const_local_iterator` 对象可用于遍历单个桶。
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---
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A class for holding extracted container elements, modelling https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle].
一个用于存放被提取容器元素的类，符合 https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle] 模型。
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---
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A specialization of an internal class template:
内部类模板的特化：
with `Iterator` = `iterator` and `NodeType` = `node_type`.
其中 `Iterator` = `iterator`，`NodeType` = `node_type`。
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---
---
Constructors
构造函数
Default Constructor
默认构造函数
```c++ unordered_set(); ```
```c++ unordered_set(); ```
Constructs an empty container using `hasher()` as the hash function, `key_equal()` as the key equality predicate, `allocator_type()` as the allocator and a maximum load factor of `1.0`.
使用 `hasher()` 作为哈希函数，`key_equal()` 作为键相等谓词，`allocator_type()` 作为分配器，以及最大负载因子 `1.0` 构造一个空容器。
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Postconditions:;; `size() == 0` Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0` 要求：如果使用默认值，则 `hasher`、`key_equal` 和 `allocator_type` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]要求。
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---
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Bucket Count Constructor
桶数构造函数
```c++ explicit unordered_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
```c++ explicit unordered_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
English Chinese (Simplified Han script) Actions
Returns:;; An iterator which refers to the past-the-end value for the container.
返回：指向容器尾后位置的迭代器。
```c++ const_iterator cbegin() const noexcept; ```
```c++ const_iterator cbegin() const noexcept; ```
A binary function object that implements an equivalence relation on values of type `Key`. A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type bool.
一个二元函数对象，用于实现 `Key` 类型值上的等价关系。该二元函数对象在 `Key` 类型值上诱导出等价关系。它接受两个 `Key` 类型的参数并返回一个 `bool` 类型的值。
_Allocator_
_Allocator_
An allocator whose value type is the same as the container's value type.
一个分配器，其值类型与容器的值类型相同。
Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
支持使用 https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[异形指针] 的分配器。
The elements are organized into buckets. Keys with the same hash code are stored in the same bucket.
元素被组织到桶中。具有相同哈希码的键存储在同一桶中。
The number of buckets can be automatically increased by a call to insert, or as the result of calling rehash.
桶的数量可以通过调用 insert 自动增加，或者作为调用 rehash 的结果。
Configuration macros
配置宏
`BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0`
`BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0`
Globally define this macro to support loading of ``unordered_set``s saved to a Boost.Serialization archive with a version of Boost prior to Boost 1.84.
全局定义此宏以支持加载由 Boost 1.84 之前版本的 Boost 保存到 Boost.Serialization 归档中的 `unordered_set`。
Typedefs
类型定义
Convertible to `const_iterator`.
可转换为 `const++_++iterator` 。
An iterator with the same value type, difference type and pointer and reference type as iterator.
一种迭代器，其值类型、差值类型以及指针和引用类型均与 iterator 相同。
A `local_iterator` object can be used to iterate through a single bucket.
`local++_iterator` 对象可用于遍历单个桶内的元素。
A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
一种常量迭代器，其值类型、差值类型以及指针和引用类型均与 const++_iterator 相同。
A const_local_iterator object can be used to iterate through a single bucket.
`const_local_iterator` 对象可用于遍历单个桶。
A class for holding extracted container elements, modelling https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle].
一个用于存放被提取容器元素的类，符合 https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle] 模型。
A specialization of an internal class template:
内部类模板的特化：
with `Iterator` = `iterator` and `NodeType` = `node_type`.
其中 `Iterator` = `iterator`，`NodeType` = `node_type`。
Constructors
构造函数
Default Constructor
默认构造函数
```c++ unordered_set(); ```
```c++ unordered_set(); ```
Constructs an empty container using `hasher()` as the hash function, `key_equal()` as the key equality predicate, `allocator_type()` as the allocator and a maximum load factor of `1.0`.
使用 `hasher()` 作为哈希函数，`key_equal()` 作为键相等谓词，`allocator_type()` 作为分配器，以及最大负载因子 `1.0` 构造一个空容器。
Returns:;; A `const_iterator` referring to the first element of the container, or if the container is empty the past-the-end value for the container.
返回：指向容器第一个元素的 `const_iterator`，若容器为空，则返回容器尾后迭代器。
```c++ const_iterator cend() const noexcept; ```
```c++ const_iterator cend() const noexcept; ```
Returns:;; A `const_iterator` which refers to the past-the-end value for the container.
返回：指向容器尾后位置的 `const_iterator`。
Bucket Count Constructor
桶数构造函数
```c++ explicit unordered_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
```c++ explicit unordered_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
Size and Capacity
大小与容量

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Translation uploaded
A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
A constant iterator with the same value type, difference type and pointer and reference type as一种常量迭代器，其值类型、差值类型以及指针和引用类型均与 const++_iterator. 相同。
06/05/2026
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A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
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String information

Flags
safe-html, strict-same
Unit identifier
50868
Source string location
:316
String age
06/05/2026
Last updated
06/06/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/modules/ROOT/pages/reference/unordered_set_zh_Hans.adoc, string 33