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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`.
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Constructs an empty table with at least `n` buckets, using `a` and default hash function and 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，使用分配器 `a` 以及默认哈希函数和键相等谓词，并将 `il` 中的元素插入其中。
:635
Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`hasher` 和 `key_equal` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
:637
---
---
initializer_list Constructor with Bucket Count and Hasher and Allocator
带桶数、哈希函数和分配器的初始化列表构造函数
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const hasher&amp; hf, const allocator_type&amp; a); ```</value_type>
Constructs an empty table 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，以 `hf` 作为哈希函数、`a` 作为分配器，使用默认键相等谓词，并将 `il` 中的元素插入其中。
:649
Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`key_equal` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
:651
---
---
Destructor
析构函数
```c++ ~concurrent_flat_set(); ```
```c++ ~concurrent_flat_set(); ```
Note:;; The destructor is applied to every element, and all memory is deallocated
注意：;; 析构函数会作用于所有元素，且所有内存都会被释放
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---
---
Assignment
赋值操作
Copy Assignment
复制赋值
```c++ concurrent_flat_set& operator=(concurrent_flat_set const& other); ```
```c++ concurrent_flat_set&amp; operator=(concurrent_flat_set const&amp; other); ```
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。销毁先前已存在的元素，从 `other` 拷贝赋值哈希函数和谓词；若 `Alloc::propagate_on_container_copy_assignment` 存在且其值为 `true`，则从 `other` 拷贝赋值分配器；最后插入 `other` 元素的副本。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] Concurrency:;; Blocking on `*this` and `other`.
要求：`value_type` 需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可复制插入^] 要求。并发：阻塞 `*this` 和 `other`。
:680
---
---
Move Assignment
移动赋值
```c++ concurrent_flat_set& operator=(concurrent_flat_set&& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_move_assignment::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 `*this`; otherwise, inserts move-constructed copies of the elements of `other`. If statistics are xref:concurrent_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++ concurrent_flat_set&amp; operator=(concurrent_flat_set&amp;&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value || boost::allocator_traits<allocator>::propagate_on_container_move_assignment::value); ```
移动赋值运算符。销毁先前已存在的元素，交换当前对象与 other 的哈希函数和谓词；若 Alloc::propagate_on_container_move_assignment 存在且其值为 true，则从 other 移动赋值分配器。若此时分配器与 other.get_allocator() 相等，other 的内部桶数组将直接转移给 *this；否则，插入由 other 元素移动构造的副本。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats [enabled]，仅当最终分配器与 other.get_allocator() 相等时，从 other 转移内部统计信息，且始终调用 other.reset_stats()。</allocator></allocator>
Concurrency:;; Blocking on `*this` and `other`.
并发特性：;; 阻塞 `*this` 与 `other`
:699
---
---
Initializer List Assignment
初始化列表赋值
```c++ concurrent_flat_set& operator=(std::initializer_list<value_type> il); ```
```c++ concurrent_flat_set&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
Assign from values in initializer list. All previously existing elements are destroyed.
通过初始化列表中的值进行赋值。先前存在的所有元素都会被销毁。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] Concurrency:;; Blocking on `*this`.
前置要求：;; `value_type` 需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]
并发特性：;; 阻塞 `*this`
:712
---
---
Visitation
访问操作
[c]visit
[c]visit
```c++ template<class F> size_t visit(const key_type& k, F f); template<class F> size_t visit(const key_type& k, F f) const; template<class F> size_t cvisit(const key_type& k, F f) const; template<class K, class F> size_t visit(const K& k, F f); template<class K, class F> size_t visit(const K& k, F f) const; template<class K, class F> size_t cvisit(const K& k, F f) const; ```
```c++ template<class f=""> size_t visit(const key_type&amp; k, F f); template<class f=""> size_t visit(const key_type&amp; k, F f) const; template<class f=""> size_t cvisit(const key_type&amp; k, F f) const; template<class k,="" class="" f=""> size_t visit(const K&amp; k, F f); template<class k,="" class="" f=""> size_t visit(const K&amp; k, F f) const; template<class k,="" class="" f=""> size_t cvisit(const K&amp; k, F f) const; ```</class></class></class></class></class></class>
If an element `x` exists with key equivalent to `k`, invokes `f` with a const reference to `x`.
若存在键与 `k` 等价的元素 `x`，则以指向 `x` 的常量引用调用函数 `f`。
English Chinese (Simplified Han script) Actions
Bucket Count Constructor with Hasher and Allocator
带哈希函数和分配器的桶数构造函数
```c++ concurrent_flat_set(size_type n, hasher const& hf, allocator_type const& a); ```
```c++ concurrent_flat_set(size_type n, hasher const&amp; hf, allocator_type const&amp; a); ```
Constructs an empty table 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，以 `hf` 作为哈希函数，使用默认键相等谓词，并以 `a` 作为分配器。
Iterator Range Constructor with Bucket Count and Allocator
带桶数和分配器的迭代器范围构造函数
Constructs an empty table with at least `n` buckets, using `a` as the allocator and default hash function and 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 `a` 作为分配器以及默认的哈希函数和键相等性谓词，并将 `++[++f, l)` 范围内的元素插入其中。
Iterator Range Constructor with Bucket Count and Hasher
带桶数和哈希函数的迭代器范围构造函数
initializer_list Constructor with Allocator
带分配器的初始化列表构造函数
Constructs an empty table using `a` and default hash function and key equality predicate, and inserts the elements from `il` into it.
构造一个使用分配器`a`、默认哈希函数和键相等谓词的空容器，并将`il`中的元素插入其中。
initializer_list Constructor with Bucket Count and Allocator
带桶数和分配器的初始化列表构造函数
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const allocator_type& a); ```
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const allocator_type&amp; a); ```</value_type>
Constructs an empty table with at least `n` buckets, using `a` and default hash function and 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，使用分配器 `a` 以及默认哈希函数和键相等谓词，并将 `il` 中的元素插入其中。
initializer_list Constructor with Bucket Count and Hasher and Allocator
带桶数、哈希函数和分配器的初始化列表构造函数
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ concurrent_flat_set(std::initializer_list<value_type> il, size_type n, const hasher&amp; hf, const allocator_type&amp; a); ```</value_type>
```c++ ~concurrent_flat_set(); ```
```c++ ~concurrent_flat_set(); ```
Note:;; The destructor is applied to every element, and all memory is deallocated
注意：;; 析构函数会作用于所有元素，且所有内存都会被释放
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。销毁先前已存在的元素，从 `other` 拷贝赋值哈希函数和谓词；若 `Alloc::propagate_on_container_copy_assignment` 存在且其值为 `true`，则从 `other` 拷贝赋值分配器；最后插入 `other` 元素的副本。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] Concurrency:;; Blocking on `*this` and `other`.
要求：`value_type` 需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可复制插入^] 要求。并发：阻塞 `*this` 和 `other`。
Move Assignment
移动赋值
```c++ concurrent_flat_set& operator=(concurrent_flat_set&& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_move_assignment::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 `*this`; otherwise, inserts move-constructed copies of the elements of `other`. If statistics are xref:concurrent_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++ concurrent_flat_set&amp; operator=(concurrent_flat_set&amp;&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value || boost::allocator_traits<allocator>::propagate_on_container_move_assignment::value); ```
移动赋值运算符。销毁先前已存在的元素，交换当前对象与 other 的哈希函数和谓词；若 Alloc::propagate_on_container_move_assignment 存在且其值为 true，则从 other 移动赋值分配器。若此时分配器与 other.get_allocator() 相等，other 的内部桶数组将直接转移给 *this；否则，插入由 other 元素移动构造的副本。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats [enabled]，仅当最终分配器与 other.get_allocator() 相等时，从 other 转移内部统计信息，且始终调用 other.reset_stats()。</allocator></allocator>
Initializer List Assignment
初始化列表赋值
```c++ concurrent_flat_set& operator=(std::initializer_list<value_type> il); ```
```c++ concurrent_flat_set&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
Assign from values in initializer list. All previously existing elements are destroyed.
通过初始化列表中的值进行赋值。先前存在的所有元素都会被销毁。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] Concurrency:;; Blocking on `*this`.
前置要求：;; `value_type` 需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]
并发特性：;; 阻塞 `*this`
Visitation
访问操作
```c++ template<class F> size_t visit(const key_type& k, F f); template<class F> size_t visit(const key_type& k, F f) const; template<class F> size_t cvisit(const key_type& k, F f) const; template<class K, class F> size_t visit(const K& k, F f); template<class K, class F> size_t visit(const K& k, F f) const; template<class K, class F> size_t cvisit(const K& k, F f) const; ```
```c++ template<class f=""> size_t visit(const key_type&amp; k, F f); template<class f=""> size_t visit(const key_type&amp; k, F f) const; template<class f=""> size_t cvisit(const key_type&amp; k, F f) const; template<class k,="" class="" f=""> size_t visit(const K&amp; k, F f); template<class k,="" class="" f=""> size_t visit(const K&amp; k, F f) const; template<class k,="" class="" f=""> size_t cvisit(const K&amp; k, F f) const; ```</class></class></class></class></class></class>
```c++ template<class ExecutionPolicy, class F> void visit_all(ExecutionPolicy&& policy, F f); template<class ExecutionPolicy, class F> void visit_all(ExecutionPolicy&& policy, F f) const; template<class ExecutionPolicy, class F> void cvisit_all(ExecutionPolicy&& policy, F f) const; ```
```c++ template<class executionpolicy,="" class="" f=""> void visit_all(ExecutionPolicy&amp;&amp; policy, F f); template<class executionpolicy,="" class="" f=""> void visit_all(ExecutionPolicy&amp;&amp; policy, F f) const; template<class executionpolicy,="" class="" f=""> void cvisit_all(ExecutionPolicy&amp;&amp; policy, F f) const; ```</class></class></class>
Returns:;; The number of elements visited (0 or 1). Notes:;; The `template<class K, class F>` overloads only participate 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：;; 访问到的元素数量（0 或 1）。
注意：;; 仅当 `Hash::is_transparent` 与 `Pred::is_transparent` 为合法成员别名时，`template<class k,="" class="" f="">` 重载版本才会参与重载决议。库假定 `Hash` 可同时接收 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
Bulk visit
批量访问
```c++ template<class FwdIterator, class F> size_t visit(FwdIterator first, FwdIterator last, F f); template<class FwdIterator, class F> size_t visit(FwdIterator first, FwdIterator last, F f) const; template<class FwdIterator, class F> size_t cvisit(FwdIterator first, FwdIterator last, F f) const; ```
```c++ template<class fwditerator,="" class="" f=""> size_t visit(FwdIterator first, FwdIterator last, F f); template<class fwditerator,="" class="" f=""> size_t visit(FwdIterator first, FwdIterator last, F f) const; template<class fwditerator,="" class="" f=""> size_t cvisit(FwdIterator first, FwdIterator last, F f) const; ```</class></class></class>
Although functionally equivalent to individually invoking xref:concurrent_flat_set_cvisit[`[c\]visit`] for each key, bulk visitation performs generally faster due to internal streamlining optimizations. It is advisable that `std::distance(first,last)` be at least xref:#concurrent_flat_set_constants[`bulk_visit_size`] to enjoy a performance gain: beyond this size, performance is not expected to increase further.
尽管功能上等同于对每个键单独调用 `[c]visit`，但得益于内部的流式优化，批量访问通常性能更高。建议当 `std::distance(first,last)` 至少达到 `bulk_visit_size` 时使用批量访问以获得性能提升；超过该大小后，性能不会进一步提升。

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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`.
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赋值运算符。销毁先前已存在的元素，从 `other` 拷贝赋值哈希函数和谓词；若 `Alloc::propagate_on_container_copy_assignment` 存在且其值为 `true`，则从 `other` 拷贝赋值分配器；最后插入 `other`. 元素的副本。
06/05/2026
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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`.
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`.
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
50291
Source string location
:672
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 148