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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`.
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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
---
---
English Chinese (Simplified Han script) Actions
Returns:;; A range containing all elements with key equivalent to `k`. If the container doesn't contain any such elements, returns `std::make_pair(b.end(), b.end())`. Notes:;; The `template<class K>` overloads only participate in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.
返回：包含所有键与 `k` 等价的元素的范围。若容器中不包含任何此类元素，则返回 `std::make_pair(b.end(), b.end())`。说明：`template<class k="">` 重载仅在 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef 时参与重载决议。库假定 `Hash` 可同时以 `K` 和 `Key` 调用，且 `Pred` 是透明的。这实现了异构查找，从而避免了实例化 `Key` 类型对象的开销。</class>
```c++ local_iterator begin(size_type n); const_local_iterator begin(size_type n) const; ```
```c++ local_iterator begin(size_type n); const_local_iterator begin(size_type n) const; ```
operator
operator
```c++ template<class Key, class Hash, class Pred, class Alloc> bool operator!=(const unordered_set<Key, Hash, Pred, Alloc>& x, const unordered_set<Key, Hash, Pred, Alloc>& y); ```
```c++ template<class key,="" class="" hash,="" pred,="" alloc=""> bool operator!=(const unordered_set<key, hash,="" pred,="" alloc="">&amp; x, const unordered_set<key, hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
Return `false` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
如果 `x.size() == y.size()` 且对于 `x` 中的每个元素，在 `y` 中均存在一个具有相同键且值相等（使用 `operator==` 比较值类型）的元素，则返回 `false`。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container and https://en.cppreference.com/w/cpp/named_req/CopyAssignable[CopyAssignable^].
要求：`value_type` 需满足对容器而言的 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可复制插入^] 要求和 https://en.cppreference.com/w/cpp/named_req/CopyAssignable[可复制赋值^] 要求。
Iterators
迭代器
: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`

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Translation uploaded
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`.
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。
06/05/2026
User avatar admin

String added in the repository
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`.
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`.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
No related strings found in the glossary.

String information

Flags
safe-html, strict-same
Unit identifier
50846
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 11