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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.
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Class Template unordered_set
类模板 unordered_set
:idprefix: unordered_set_
:idprefix: unordered_set_
`boost::unordered_set` — An unordered associative container that stores unique values.
`boost::unordered++_++set` — 一种用于存储唯一值的无序关联容器。
Synopsis
概要
:239
---
---
Description
描述
*Template Parameters*
*模板参数*
_Key_
_键_
`Key` must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container (i.e. `allocator_traits` can destroy it).
`Key` 必须可以从容器中 https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^]（即 `allocator_traits` 能够销毁它）。
_Hash_
_Hash_
A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数并返回 `std::size_t` 类型的值。
_Pred_
_Pred_
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
:281
A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value_type`。
:283
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` 。
:287
---
---
:294
A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value_type`。
:296
The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
English Chinese (Simplified Han script) Actions
:idprefix: unordered_set_
:idprefix: unordered_set_
`boost::unordered_set` — An unordered associative container that stores unique values.
`boost::unordered++_++set` — 一种用于存储唯一值的无序关联容器。
Synopsis
概要
Description
描述
*Template Parameters*
*模板参数*
_Key_
_键_
`Key` must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container (i.e. `allocator_traits` can destroy it).
`Key` 必须可以从容器中 https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^]（即 `allocator_traits` 能够销毁它）。
_Hash_
_Hash_
A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数并返回 `std::size_t` 类型的值。
_Pred_
_Pred_
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
Returns:;; An 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迭代器，若容器为空则返回容器尾后迭代器。
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
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。

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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.
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。
06/05/2026
User avatar admin

String added in the repository
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.
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.
06/05/2026
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English Chinese (Simplified Han script)
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String information

Flags
safe-html, strict-same
Unit identifier
50848
Source string location
:246
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 13