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The copy constructor. Copies the contained elements, hash function, predicate and allocator.
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```c++ concurrent_flat_set(); ```
```c++ concurrent_flat_set(); ```
Constructs an empty table using `hasher()` as the hash function, `key_equal()` as the key equality predicate and `allocator_type()` as the allocator.
构造一个空容器，使用`hasher()`作为哈希函数，`key_equal()`作为键相等谓词，`allocator_type()`作为分配器。
:403
Postconditions:;; `size() == 0` Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0` 要求：若使用默认参数，则 `hasher`、`key_equal` 和 `allocator_type` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
:406
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Bucket Count Constructor
桶数构造函数
```c++ explicit concurrent_flat_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
```c++ explicit concurrent_flat_set(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, and `a` as the allocator.
构造一个拥有至少`n`个桶的空容器，使用`hf`作为哈希函数，`eql`作为键相等谓词，`a`作为分配器。
:420
Postconditions:;; `size() == 0` Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0`
要求：若使用默认参数，则 `hasher`、`key_equal` 和 `allocator_type` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
:423
---
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Iterator Range Constructor
迭代器范围构造函数
Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a` as the allocator, 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、 `eql` 作为键相等性谓词、 `a` 作为分配器，并将 `++[++f, l)` 范围内的元素插入其中。
:439
Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求;; 若使用默认值，则 `hasher` 、 `key++_++equal` 和 `allocator++_++type` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造] 要求。
:441
---
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Copy Constructor
复制构造函数
```c++ concurrent_flat_set(concurrent_flat_set const& other); ```
```c++ concurrent_flat_set(concurrent_flat_set const& other); ```
The copy constructor. Copies the contained elements, hash function, predicate and allocator.
拷贝构造函数。拷贝容器内的元素、哈希函数、相等谓词及分配器。
If `Allocator::select_on_container_copy_construction` exists and has the right signature, the allocator will be constructed from its result.
若`Allocator::select_on_container_copy_construction`存在且签名正确，则分配器将根据其返回值构造。
Requires:;; `value_type` is copy constructible Concurrency:;; Blocking on `other`.
要求：`value_type` 可复制构造。并发：阻塞 `other`。
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Move Constructor
移动构造函数
```c++ concurrent_flat_set(concurrent_flat_set&& other); ```
```c++ concurrent_flat_set(concurrent_flat_set&& other); ```
The move constructor. The internal bucket array of `other` is transferred directly to the new table. The hash function, predicate and allocator are moved-constructed from `other`. If statistics are xref:concurrent_flat_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` and calls `other.reset_stats()`.
移动构造函数。`other` 的内部桶数组将直接转移至新容器。哈希函数、谓词及分配器均从 `other` 移动构造。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats[启用]，则从 `other` 转移内部统计信息并调用 `other.reset_stats()`。
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Concurrency:;; Blocking on `other`.
并发说明：;; 对 `other` 产生阻塞
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Iterator Range Constructor with Allocator
带分配器的迭代器范围构造函数
```c++ template<class InputIterator> concurrent_flat_set(InputIterator f, InputIterator l, const allocator_type& a); ```
```c++ template<class inputiterator=""> concurrent_flat_set(InputIterator f, InputIterator l, const allocator_type&amp; a); ```</class>
Constructs an empty table using `a` as the allocator, with the default hash function and key equality predicate and inserts the elements from `[f, l)` into it.
构造一个以`a`为分配器、使用默认哈希函数与键相等谓词的空容器，并将`[f, l)`范围内的元素插入其中。
:482
Requires:;; `hasher`, `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`hasher`、`key_equal` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
:484
---
---
Allocator Constructor
分配器构造函数
```c++ explicit concurrent_flat_set(Allocator const& a); ```
```c++ explicit concurrent_flat_set(Allocator const&amp; a); ```
English Chinese (Simplified Han script) Actions
Initializer List Constructor
初始化列表构造函数
Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate and `a`, 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、 `eql` 作为键相等性谓词、 `a` 作为分配器，并 `il` 中的元素插入其中。
The copy constructor. Copies the contained elements, hash function, predicate and allocator.
拷贝构造函数。拷贝容器内的元素、哈希函数、相等谓词及分配器。
Requires:;; `value_type` is copy constructible Concurrency:;; Blocking on `other`.
要求：`value_type` 可复制构造。并发：阻塞 `other`。
Move Constructor
移动构造函数
```c++ concurrent_flat_set(concurrent_flat_set&& other); ```
```c++ concurrent_flat_set(concurrent_flat_set&amp;&amp; other); ```
The move constructor. The internal bucket array of `other` is transferred directly to the new table. The hash function, predicate and allocator are moved-constructed from `other`. If statistics are xref:concurrent_flat_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` and calls `other.reset_stats()`.
移动构造函数。`other` 的内部桶数组将直接转移至新容器。哈希函数、谓词及分配器均从 `other` 移动构造。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats[启用]，则从 `other` 转移内部统计信息并调用 `other.reset_stats()`。
```c++ template<class InputIterator> concurrent_flat_set(InputIterator f, InputIterator l, const allocator_type& a); ```
```c++ template<class inputiterator=""> concurrent_flat_set(InputIterator f, InputIterator l, const allocator_type&amp; a); ```</class>
Allocator Constructor
分配器构造函数
```c++ explicit concurrent_flat_set(Allocator const& a); ```
```c++ explicit concurrent_flat_set(Allocator const&amp; a); ```
Constructs a table, copying ``other``'s contained elements, hash function, and predicate, but using allocator `a`.
构造一个容器，复制 `other` 中的元素、哈希函数和谓词，但使用分配器 `a`。
Move Constructor with Allocator
带分配器的移动构造函数
```c++ concurrent_flat_set(concurrent_flat_set&& other, Allocator const& a); ```
```c++ concurrent_flat_set(concurrent_flat_set&amp;&amp; other, Allocator const&amp; a); ```
If `a == other.get_allocator()`, the elements of `other` are transferred directly to the new table; otherwise, elements are moved-constructed from those of `other`. The hash function and predicate are moved-constructed from `other`, and the allocator is copy-constructed from `a`. If statistics are xref:concurrent_flat_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` iff `a == other.get_allocator()`, and always calls `other.reset_stats()`.
若`a == other.get_allocator()`，则`other`的元素将直接转移至新容器；否则，元素从`other`的元素移动构造而来。哈希函数与谓词从`other`移动构造，分配器从`a`拷贝构造。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats[enabled]，仅当`a == other.get_allocator()`时从`other`转移内部统计信息，且始终调用`other.reset_stats()`。
Move Constructor from unordered_flat_set
从 unordered++_++flat++_++set 的移动构造函数
```c++ concurrent_flat_set(unordered_flat_set<Key, Hash, Pred, Allocator>&& other); ```
```c++ concurrent_flat_set(unordered_flat_set<key, hash,="" pred,="" allocator="">&amp;&amp; other); ```</key,>
Move construction from a xref:#unordered_flat_set[`unordered_flat_set`]. The internal bucket array of `other` is transferred directly to the new container. The hash function, predicate and allocator are moved-constructed from `other`. If statistics are xref:concurrent_flat_set_boost_unordered_enable_stats[enabled], transfers the internal statistical information from `other` and calls `other.reset_stats()`.
通过 xref:#unordered_flat_set[`unordered_flat_set`] 移动构造。`other` 的内部桶数组直接转移至新容器。哈希函数、谓词及分配器均从 `other` 移动构造。若统计功能已通过 xref:concurrent_flat_set_boost_unordered_enable_stats[enabled]，则从 `other` 转移内部统计信息并调用 `other.reset_stats()`。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
要求;; `x.key++_++equal()` 需要在功能上等价于 `other.key++_++equal()` 。 并发性;; 阻塞于 `x` 。

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The copy constructor. Copies the contained elements, hash function, predicate and allocator.
The copy constructor. Copies the contained elements, hash function, predicate and allocator.拷贝构造函数。拷贝容器内的元素、哈希函数、相等谓词及分配器。
06/05/2026
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The copy constructor. Copies the contained elements, hash function, predicate and allocator.
The copy constructor. Copies the contained elements, hash function, predicate and allocator.
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
50214
Source string location
:448
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 71