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Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
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Key English Chinese (Simplified Han script) Actions
hash_function
哈希函数
``` hasher hash_function() const; ```
``` hasher hash_function() const; ```
Returns:;; The table's hash function.
返回值：;; 表的哈希函数。
:1336
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---
key_eq
key_eq
``` key_equal key_eq() const; ```
``` key_equal key_eq() const; ```
Returns:;; The table's key equality predicate.
返回值：;; 表的键相等性断言。
:1346
---
---
Set Operations
集合操作
count
count
```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` (0 or 1). 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
返回值：;; 键与`k`等价的元素数量（0 或 1）。
备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。

在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
:1364
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---
contains
包含
```c++ bool contains(const key_type& k) const; template<class K> bool contains(const K& k) const; ```
```c++ bool contains(const key_type&amp; k) const; template<class k=""> bool contains(const K&amp; k) const; ```</class>
Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
返回值：;; 布尔值，表示表中是否存在键与`k`相等的元素。
备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。
在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
:1380
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---
Bucket Interface
桶接口
bucket_count
bucket_count
```c++ size_type bucket_count() const noexcept; ```
```c++ size_type bucket_count() const noexcept; ```
Returns:;; The size of the bucket array.
返回值：;; 哈希桶数组的大小。
:1391
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---
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`.
返回值：;; `static_cast<float>(size()) / static_cast<float>(bucket_count())`；若`bucket_count() == 0`，则返回`0`。</float></float>
:1403
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---
max_load_factor
max_load_factor
```c++ float max_load_factor() const noexcept; ```
```c++ float max_load_factor() const noexcept; ```
Returns:;; Returns the table's maximum load factor.
返回值：;; 返回哈希表的最大负载因子。
:1414
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---
English Chinese (Simplified Han script) Actions
Returns:;; The number of elements erased (0 or 1). Throws:;; Only throws an exception if it is thrown by `hasher`, `key_equal` or `f`. Notes:;; The `template<class K, class F>` overload only participates in overload resolution if `std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>>` is `false`. + + The `template<class K, class F>` 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.
返回值：;; 删除的元素数量（0 或 1）。
抛出：;; 仅当 `hasher`、`key_equal` 或 `f` 抛出异常时才会抛出异常。
备注：;; 仅当 `std::is_execution_policy_v<std::remove_cvref_t<executionpolicy>&gt;` 为 `false` 时，`template<class k,="" class="" f="">` 重载才参与重载决议。

仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k,="" class="" f="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。</class></class></std::remove_cvref_t<executionpolicy>
Parallel erase_if
并行条件擦除
Invokes `f` with references to each of the elements in the table, and erases those for which `f` returns `true`. Execution is parallelized according to the semantics of the execution policy specified.
以表中每个元素的引用调用`f`，并删除`f`返回`true`的元素。执行过程将根据指定执行策略的语义进行并行化。
```c++ void swap(concurrent_flat_set& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```
```c++ void swap(concurrent_flat_set&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value || boost::allocator_traits<allocator>::propagate_on_container_swap::value); ```</allocator></allocator>
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the tables' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
若`Allocator::propagate_on_container_swap`已声明且`Allocator::propagate_on_container_swap::value`为`true`，则交换两个表的分配器。否则，使用不相等的分配器进行交换会导致未定义行为。
Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()` Concurrency:;; Blocking on `*this`.
后置条件：;; `size() == 0`，`max_load() &gt;= max_load_factor() * bucket_count()`
并发：;; 阻塞`*this`。
merge
合并
```c++ template<class H2, class P2> size_type merge(concurrent_flat_set<Key, H2, P2, Allocator>& source); template<class H2, class P2> size_type merge(concurrent_flat_set<Key, H2, P2, Allocator>&& source); ```
```c++ template<class h2,="" class="" p2=""> size_type merge(concurrent_flat_set<key, h2,="" p2,="" allocator="">&amp; source); template<class h2,="" class="" p2=""> size_type merge(concurrent_flat_set<key, h2,="" p2,="" allocator="">&amp;&amp; source); ```</key,></class></key,></class>
Returns:;; The table's allocator.
返回值：;; 表的分配器。
hash_function
哈希函数
``` hasher hash_function() const; ```
``` hasher hash_function() const; ```
Returns:;; The table's hash function.
返回值：;; 表的哈希函数。
key_eq
key_eq
contains
包含
```c++ bool contains(const key_type& k) const; template<class K> bool contains(const K& k) const; ```
```c++ bool contains(const key_type&amp; k) const; template<class k=""> bool contains(const K&amp; k) const; ```</class>
Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
返回值：;; 布尔值，表示表中是否存在键与`k`相等的元素。
备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。
在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
Bucket Interface
桶接口
max_load_factor
max_load_factor
max_load
max_load（最大负载）
```c++ size_type max_load() const noexcept; ```
```c++ size_type max_load() const noexcept; ```
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 table.
效果：;; 必要时调整哈希桶数组的大小，使桶数量至少为 `n`，且负载因子小于等于最大负载因子。
适用情况下，该操作会**增大或缩小**哈希表的桶数量（`bucket_count()`）。
When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array.
当 `size() == 0` 时，`rehash(0)` 会释放底层的哈希桶数组内存。
Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the table.
与 `rehash` 功能类似，该函数可用于**增加或减少**哈希表中的桶数量。
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the table's hash function or comparison function. Concurrency:;; Blocking on `*this`.
抛出：;; 若抛出异常，函数不会产生任何效果（哈希表的哈希函数或比较函数抛出的异常除外）。
并发：;; 阻塞`*this`。
Effects:;; Sets to zero the internal statistics kept by the table. Notes:;; Only available if xref:reference/stats.adoc#stats[statistics calculation] is xref:concurrent_flat_set_boost_unordered_enable_stats[enabled].
效果：;; 将哈希表内部统计数据置零。
备注：;; 仅当 xref:reference/stats.adoc#stats[统计计算] 被 xref:concurrent_flat_set_boost_unordered_enable_stats[启用] 时，本接口方可使用。
Deduction Guides
推导指引
- It has an `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.
- 该推导指引包含 `InputIterator` 模板参数，且为此参数推导出的类型不符合输入迭代器的要求。 - 该推导指引包含 `Allocator` 模板参数，且为该参数推导出的类型不符合分配器要求。 - 该推导指引包含 `Hash` 模板参数，且为该参数推导出的类型为整型或符合分配器要求。 - 该推导指引包含 `Pred` 模板参数，且为该参数推导出的类型符合分配器要求。
Equality Comparisons
相等性比较
operator
operator
Returns `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).
若 x.size() == y.size()，且对于 x 中的每个元素，y 中均存在一个具有相同键、值相等（使用 operator== 比较值类型）的元素，则返回 false。

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Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. Notes:;; The `template<class K>` overload only participates in overload resolution if返回值：;; 布尔值，表示表中是否存在键与`k`相等的元素。
备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` and与 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。
在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
06/05/2026
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Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
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
50496
Source string location
:1374
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/concurrent_flat_set_zh_Hans.adoc, string 353