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When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
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max_load_factor
最大负载因子
```c++ float max_load_factor() const noexcept; ```
```c++ float max_load_factor() const noexcept; ```
Returns:;; Returns the container's maximum load factor.
返回：;; 返回容器的最大负载因子。
:1094
---
---
Set max_load_factor
设置最大负载因子
```c++ void max_load_factor(float z); ```
```c++ void max_load_factor(float z); ```
Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_set`.
效果：;; 不执行任何操作，因为用户不允许更改此参数。为与 `boost::unordered_set` 保持兼容而保留。
:1104
---
---
max_load
最大负载
```c++ size_type max_load() const noexcept; ```
```c++ size_type max_load() const noexcept; ```
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。
:1118
---
---
rehash
重哈希
```c++ void rehash(size_type n); ```
```c++ void rehash(size_type n); ```
Changes if necessary the size of the bucket array so that there are at least `n` buckets, and so that the load factor is less than or equal to the maximum load factor. When applicable, this will either grow or shrink the `bucket_count()` associated with the container.
必要时改变桶数组的大小，使得至少包含 `n` 个桶，并且负载因子小于或等于最大负载因子。在适用的情况下，这将增大或缩小与容器相关联的 `bucket_count()`。
When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
当 `size() == 0` 时，`rehash(0)` 将释放底层桶数组的内存。如果所提供的分配器使用 fancy pointers，随后将执行一次默认分配。
:1129
Invalidates iterators, pointers and references, and changes the order of elements.
使迭代器、指针和引用失效，并改变元素的顺序。
:1132
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
:1134
---
---
reserve
保留
```c++ void reserve(size_type n); ```
```c++ void reserve(size_type n); ```
Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`.
等价于 `a.rehash(ceil(n / a.max_load_factor()))`。
Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.
与 `rehash` 类似，此函数可用于增加或减少容器中桶的数量。
:1145
Invalidates iterators, pointers and references, and changes the order of elements.
使迭代器、指针和引用失效，并改变元素的顺序。
:1148
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
:1150
---
---
Statistics
统计信息
get_stats
get_stats
```c++ stats get_stats() const; ```
```c++ stats get_stats() const; ```
Returns:;; A statistical description of the insertion and lookup operations performed by the container so far. Notes:;; Only available if xref:reference/stats.adoc#stats[statistics calculation] is xref:unordered_flat_set_boost_unordered_enable_stats[enabled].
返回：;; 对容器迄今为止所执行的插入和查找操作的统计描述。备注：;; 仅在 xref:reference/stats.adoc#stats[统计信息计算] 已 xref:unordered_flat_set_boost_unordered_enable_stats[启用] 时可用。
:1163
---
---
English Chinese (Simplified Han script) Actions
pull
pull
Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()`
Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()`
merge
合并
```c++ size_type count(const key_type& k) const; template<class K> size_type count(const K& k) const; ```
```c++ size_type count(const key_type&amp; k) const; template<class k=""> size_type count(const K&amp; k) const; ```</class>
Returns:;; The number of elements with key equivalent to `k`. Notes:;; The `template<class K>` overload only participates 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：;; 键与 `k` 等价的元素个数。备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef 时才会参与重载决议。库假定 `Hash` 可同时以 `K` 和 `Key` 类型调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型的开销。</class>
```c++ std::pair<iterator, iterator> equal_range(const key_type& k); std::pair<const_iterator, const_iterator> equal_range(const key_type& k) const; template<class K> std::pair<iterator, iterator> equal_range(const K& k); template<class K> std::pair<const_iterator, const_iterator> equal_range(const K& k) const; ```
```c++ std::pair<iterator, iterator=""> equal_range(const key_type&amp; k); std::pair<const_iterator, const_iterator=""> equal_range(const key_type&amp; k) const; template<class k=""> std::pair<iterator, iterator=""> equal_range(const K&amp; k); template<class k=""> std::pair<const_iterator, const_iterator=""> equal_range(const K&amp; k) const; ```</const_iterator,></class></iterator,></class></const_iterator,></iterator,>
Bucket Interface
桶接口
Returns:;; The size of the bucket array.
返回：;; 桶数组的大小。
Hash Policy
哈希策略
load_factor
负载因子
```c++ float load_factor() const noexcept; ```
```c++ float load_factor() const noexcept; ```
Returns:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket_count() == 0`.
返回：;; `static_cast<float>(size())/static_cast<float>(bucket_count())`，如果 `bucket_count() == 0` 则返回 `0`。</float></float>
max_load_factor
最大负载因子
```c++ void rehash(size_type n); ```
```c++ void rehash(size_type n); ```
Changes if necessary the size of the bucket array so that there are at least `n` buckets, and so that the load factor is less than or equal to the maximum load factor. When applicable, this will either grow or shrink the `bucket_count()` associated with the container.
必要时改变桶数组的大小，使得至少包含 `n` 个桶，并且负载因子小于或等于最大负载因子。在适用的情况下，这将增大或缩小与容器相关联的 `bucket_count()`。
When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
当 `size() == 0` 时，`rehash(0)` 将释放底层桶数组的内存。如果所提供的分配器使用 fancy pointers，随后将执行一次默认分配。
```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```
```c++ template<class... args=""> std::pair<iterator, bool=""> emplace(Args&amp;&amp;... args); ```</iterator,></class...>
`boost::unordered_flat_set` — An open-addressing unordered associative container that stores unique values.
`boost::unordered_flat_set` — 一种开放定址无序关联容器，用于存储唯一值。
The performance of `boost::unordered_flat_set` is much better than that of `boost::unordered_set` or other implementations of `std::unordered_set`. Unlike standard unordered associative containers, which are node-based, the elements of a `boost::unordered_flat_set` are held directly in the bucket array, and insertions into an already occupied bucket are diverted to available buckets in the vicinity of the original position. This type of data layout is known as _open addressing_.
`boost::unordered_flat_set` 的性能远优于 `boost::unordered_set` 或 `std::unordered_set` 的其他实现。与基于节点的标准无序关联容器不同，`boost::unordered_flat_set` 的元素直接保存在桶数组中，当插入位置已被占用时，会转移到原始位置附近可用的桶中。这种数据布局称为**开放定址**。
As a result of its using open addressing, the interface of `boost::unordered_flat_set` deviates in a number of aspects from that of `boost::unordered_flat_set`/`std::unordered_flat_set`:
由于采用开放定址，`boost::unordered_flat_set` 的接口在多个方面与 `boost::unordered_set`/`std::unordered_set` 存在差异：
- `value_type` must be move-constructible. - Pointer stability is not kept under rehashing. - `begin()` is not constant-time. - There is no API for bucket handling (except `bucket_count`) or node extraction/insertion. - The maximum load factor of the container is managed internally and can't be set by the user.
- `value_type` 必须可移动构造。
- 在重哈希过程中不保持指针稳定性。
- `begin()` 不是常数时间操作。
- 没有用于桶操作的 API（除了 `bucket_count`），也没有节点提取/插入的 API。
- 容器的最大负载因子由内部管理，用户无法设置。
_Key_
_键_
`Key` must be https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] into the container
`Key` 必须可以 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] 到容器中
_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`.
一种一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数，并返回一个 `std::size_t` 类型的值。
An allocator whose value type is the same as the container's value type.
一种分配器，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[fancy pointers] 的分配器。
The elements of the container are held into an internal _bucket array_. An element is inserted into a bucket determined by its hash code, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.
容器的元素保存在内部的**桶数组**中。元素根据其哈希码被插入到对应的桶中，但如果该桶已被占用（发生**冲突**），则会使用原始位置附近的一个可用桶。
The size of the bucket array can be automatically increased by a call to `insert`/`emplace`, or as a result of calling `rehash`/`reserve`. The _load factor_ of the container (number of elements divided by number of buckets) is never greater than `max_load_factor()`, except possibly for small sizes where the implementation may decide to allow for higher loads.
桶数组的大小可以通过调用 `insert`/`emplace` 自动增加，或者作为调用 `rehash`/`reserve` 的结果而增加。容器的**负载因子**（元素个数除以桶数量）永远不会大于 `max_load_factor()`，但在容量较小的情况下，实现可能会允许更高的负载。
If `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<Hash>::value` is `true`, the hash function is used as-is; otherwise, a bit-mixing post-processing stage is added to increase the quality of hashing at the expense of extra computational cost.
如果`link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanching[hash_is_avalanching]<hash>::value` 为 `true`，则哈希函数将按原样使用；否则，将添加一个比特混合后处理阶段，以增加哈希质量，但会增加额外的计算成本。</hash>

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When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
When当 `size() == 0`, 时，`rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.将释放底层桶数组的内存。如果所提供的分配器使用 fancy pointers，随后将执行一次默认分配。
06/05/2026
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String added in the repository
When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
06/05/2026
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String information

Flags
safe-html, strict-same
Unit identifier
54468
Source string location
:1127
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 311