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Returns:;; A `const_iterator` which refers to the past-the-end value for the container.
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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()`)
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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：;; 指向容器尾后值的迭代器。
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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. 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()`)
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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
```c++ size_type max_size() const noexcept; ```
```c++ size_type max_size() const noexcept; ```
Returns:;; `size()` of the largest possible container.
返回：;; 可能的最大容器的 `size()`。
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---
---
Modifiers
修改器
English Chinese (Simplified Han script) Actions
Returns:;; The maximum number of elements the container can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the container's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions.
返回：;; 假设不再删除更多元素，容器在不进行重哈希的情况下所能容纳的最大元素数量。注意：;; 在构造、重哈希或清空之后，容器的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下，该值可能因删除操作而减小。
rehash
重哈希
Destructor
析构函数
The assignment operator. Destroys previously existing elements, copy-assigns the hash function and predicate from `other`, copy-assigns the allocator from `other` if `Alloc::propagate_on_container_copy_assignment` exists and `Alloc::propagate_on_container_copy_assignment::value` is `true`, and finally inserts copies of the elements of `other`.
赋值运算符。销毁先前存在的元素，从 `other` 复制赋值哈希函数和谓词，如果 `Alloc::propagate_on_container_copy_assignment` 存在且 `Alloc::propagate_on_container_copy_assignment::value` 为 `true`，则从 `other` 复制赋值分配器，最后插入 `other` 元素的副本。
Move Assignment
移动赋值
```c++ unordered_flat_set& operator=(unordered_flat_set&& other) noexcept((boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_move_assignment::value) && std::is_same<pointer, value_type*>::value); ``` The move assignment operator. Destroys previously existing elements, swaps the hash function and predicate from `other`, and move-assigns the allocator from `other` if `Alloc::propagate_on_container_move_assignment` exists and `Alloc::propagate_on_container_move_assignment::value` is `true`. If at this point the allocator is equal to `other.get_allocator()`, the internal bucket array of `other` is transferred directly to the new container; otherwise, inserts move-constructed copies of the elements of `other`. If statistics are xref:unordered_flat_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` iff the final allocator is equal to `other.get_allocator()`, and always calls `other.reset_stats()`.
```c++
unordered_flat_set&amp; operator=(unordered_flat_set&amp;&amp; other) noexcept((boost::allocator_traits<allocator>::is_always_equal::value || boost::allocator_traits<allocator>::propagate_on_container_move_assignment::value) &amp;&amp; std::is_same<pointer, value_type*="">::value);
```
移动赋值运算符。销毁先前存在的元素，交换来自 `other` 的哈希函数和谓词，如果 `Alloc::propagate_on_container_move_assignment` 存在且 `Alloc::propagate_on_container_move_assignment::value` 为 `true`，则从 `other` 移动赋值分配器。如果此时分配器等于 `other.get_allocator()`，则 `other` 的内部桶数组直接转移给当前容器；否则，插入 `other` 元素的移动构造副本。如果启用了统计信息（xref:unordered_flat_set_boost_unordered_enable_stats[enabled]），则仅当最终的分配器等于 `other.get_allocator()` 时才从 `other` 转移内部统计信息，并且总是调用 `other.reset_stats()`。</pointer,></allocator></allocator>
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>
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()`)
end
end
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
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。
size
大小
*Template Parameters*
*模板参数*
Allocator Constructor
分配器构造函数
Copy Constructor with Allocator
带分配器的复制构造函数
Complexity:;; Constant time. Concurrency:;; Blocking on `other`.
复杂度：;; 常数时间。
并发性：;; 在 `other` 上阻塞。
`position` is a suggestion to where the element should be inserted. This implementation ignores it.
`position` 是关于元素应该插入位置的一个提示。此实现会忽略它。
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator, with the default key equality predicate, and inserts the elements from `[f, l)` 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，并使用默认的键相等谓词，然后将 `[f, l)` 范围内的元素插入其中。
```c++ size_type erase(const key_type& k); template<class K> size_type erase(K&& k); ```
```c++ size_type erase(const key_type&amp; k); template<class k=""> size_type erase(K&amp;&amp; k); ```</class>
get_stats
get_stats
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()` 并且对于 `x` 中的每个元素，在 `y` 中都有一个具有相同键且值相等的元素（使用 `operator==` 比较值类型），则返回 `false`。
operator!
operator!
```c++ ~unordered_flat_set(); ```
```c++ ~unordered_flat_set(); ```
```c++ unordered_flat_set& operator=(unordered_flat_set const& other); ```
```c++ unordered_flat_set&amp; operator=(unordered_flat_set const&amp; other); ```
Erase all elements with key equivalent to `k`.
删除所有键与 `k` 等价的元素。

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Translation uploaded
Returns:;; A `const_iterator` which refers to the past-the-end value for the container.
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。
06/05/2026
User avatar admin

String added in the repository
Returns:;; A `const_iterator` which refers to the past-the-end value for the container.
Returns:;; A `const_iterator` which refers to 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
54310
Source string location
:657
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 153