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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. Complexity:;; O(`bucket_count()`)
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Key English Chinese (Simplified Han script) Actions
Initializer List Assignment
初始化列表赋值
```c++ unordered_flat_set& operator=(std::initializer_list<value_type> il); ```
```c++ unordered_flat_set&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
Assign from values in initializer list. All previously existing elements are destroyed.
从初始化列表中的值进行赋值。所有先前存在的元素均被销毁。
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]
要求：;; `value_type` 必须是 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]。
Iterators
迭代器
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. Complexity:;; O(`bucket_count()`)
返回：;; 指向容器第一个元素的迭代器，若容器为空，则返回容器的尾后迭代器。
复杂度：;; O(`bucket_count()`)
:627
---
---
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：;; 指向容器尾后值的迭代器。
:638
---
---
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. Complexity:;; O(`bucket_count()`)
返回：;; 指向容器第一个元素的常量迭代器，若容器为空，则返回容器的尾后常量迭代器。
复杂度：;; O(`bucket_count()`)
:649
---
---
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：;; 指向容器尾后值的常量迭代器。
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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
Key English Chinese (Simplified Han script) Actions
Modifiers
修改器
Returns:;; `size() == 0`
返回：;; `size() == 0`
Returns:;; `size()` of the largest possible container.
返回：;; 可能的最大容器的 `size()`。
```c++ template<class... Args> iterator emplace_hint(const_iterator position, Args&&... args); ```
```c++ template<class... args=""> iterator emplace_hint(const_iterator position, Args&amp;&amp;... args); ```</class...>
```c++ std::pair<iterator, bool> insert(const value_type& obj); ```
```c++ std::pair<iterator, bool=""> insert(const value_type&amp; obj); ```</iterator,>
Constructs an empty container, using allocator `a`.
构造一个空容器，使用分配器 `a`。
Move Constructor from concurrent_flat_set
从 concurrent_flat_set 移动构造
```c++ unordered_flat_set(concurrent_flat_set<Key, Hash, Pred, Allocator>&& other); ```
```c++ unordered_flat_set(concurrent_flat_set<key, hash,="" pred,="" allocator="">&amp;&amp; other); ```</key,>
```c++ unordered_flat_set(size_type n, allocator_type const& a); ```
```c++ unordered_flat_set(size_type n, allocator_type const&amp; a); ```
Bucket Count Constructor with Hasher and Allocator
带哈希函数和分配器的桶数构造函数
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default key equality predicate and `a` as the allocator.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，默认的键相等谓词，并以 `a` 作为分配器。
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and default key equality predicate,and inserts the elements from `il` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，`a` 作为分配器，以及默认的键相等谓词，并将 `il` 中的元素插入其中。
Note:;; The destructor is applied to every element, and all memory is deallocated
注意：;; 析构函数会应用于每个元素，并且所有内存都会被释放。
Assignment
赋值操作
Copy Assignment
复制赋值
Assign from values in initializer list. All previously existing elements are destroyed.
从初始化列表中的值进行赋值。所有先前存在的元素均被销毁。
Iterators
迭代器
Returns:;; An iterator which refers to the past-the-end value for the container.
返回：;; 指向容器尾后值的迭代器。
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. Complexity:;; O(`bucket_count()`)
返回：;; 指向容器第一个元素的常量迭代器，若容器为空，则返回容器的尾后常量迭代器。
复杂度：;; O(`bucket_count()`)
Size and Capacity
大小与容量
empty
空
```c++ [[nodiscard]] bool empty() const noexcept; ```
```c++ [[nodiscard]] bool empty() const noexcept; ```
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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. Complexity:;; O(`bucket_count()`)
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. Complexity:返回：;; 指向容器第一个元素的常量迭代器，若容器为空，则返回容器的尾后常量迭代器。
复杂度：;; O(`bucket_count()`)
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. Complexity:;; O(`bucket_count()`)
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. Complexity:;; O(`bucket_count()`)
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
54306
Source string location
:646
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_flat_set_zh_Hans.adoc, string 149