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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.
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```c++ unordered_set& operator=(std::initializer_list<value_type> il); ```
```c++ unordered_set&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
将初始化列表中的值赋给容器。所有已存在的元素将被新元素覆盖或销毁。
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。
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---
---
Iterators
迭代器
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begin
begin
```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。
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---
---
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end
end
```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。
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---
---
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cbegin
cbegin
```c++ const_iterator cbegin() const noexcept; ```
```c++ const_iterator cbegin() const noexcept; ```
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。
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---
---
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cend
cend
```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`。
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---
---
Size and Capacity
大小与容量
empty
空
```c++ [[nodiscard]] bool empty() const noexcept; ```
```c++ [[nodiscard]] bool empty() const noexcept; ```
Returns:;; `size() == 0`
返回：`size() == 0`
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---
---
size
大小
```c++ size_type size() const noexcept; ```
```c++ size_type size() const noexcept; ```
Returns:;; `std::distance(begin(), end())`
返回：`std::distance(begin(), end())`
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---
---
max_size
max_size
English Chinese (Simplified Han script) Actions
`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&amp; hf = hasher(), const key_equal&amp; eql = key_equal(), const allocator_type&amp; a = allocator_type()); ```
Size and Capacity
大小与容量
empty
空
```c++ [[nodiscard]] bool empty() const noexcept; ```
```c++ [[nodiscard]] bool empty() const noexcept; ```
Returns:;; `size() == 0`
返回：`size() == 0`
size
大小
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `a` as the allocator and a maximum load factor of `1.0`.
explicit unordered_set(size_type n, const hasher&amp; hf = hasher(), const key_equal&amp; eql = key_equal(), const allocator_type&amp; a = allocator_type());
Iterator Range Constructor
迭代器范围构造函数
```c++ size_type size() const noexcept; ```
```c++ size_type size() const noexcept; ```
Returns:;; `std::distance(begin(), end())`
返回：`std::distance(begin(), end())`
max_size
max_size

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Translation uploaded
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.
Returns:;; A返回：指向容器第一个元素的 `const_iterator` referring to the first element of the container, or if the container is empty the past-the-end value for the container.，若容器为空，则返回容器尾后迭代器。
06/05/2026
User avatar admin

String added in the repository
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.
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.
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
50989
Source string location
:676
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 154