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Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
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Swaps the contents of `x` and `y`.
交换 `x` 和 `y` 的内容。
:1234
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
如果 `Allocator::propagate_on_container_swap` 已声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换两个容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
Effects:;; `x.swap(y)` Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping.
效果：;; `x.swap(y)` 抛出：;; 除非 `key_equal` 或 `hasher` 在交换时抛出异常，否则不抛出任何异常。
:1240
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---
erase_if
erase_if
```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_flat_set<K, T, H, P, A>::size_type erase_if(unordered_flat_set<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename unordered_flat_set<k, t,="" h,="" p,="" a="">::size_type erase_if(unordered_flat_set<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Traverses the container `c` and removes all elements for which the supplied predicate returns `true`.
遍历容器 `c` 并移除所有使给定谓词返回 `true` 的元素。
Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ```
返回：;; 被移除的元素数量。备注：;; 等价于：```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ```
Serialization
序列化
``unordered_flat_set``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.
`unordered_flat_set` 可以通过本库提供的 API，使用 link:../../../../../serialization/index.html[Boost.Serialization^] 进行归档/恢复。支持常规归档和 XML 归档。
Saving an unordered_flat_set to an archive
将 unordered_flat_set 保存到归档中
Saves all the elements of an `unordered_flat_set` `x` to an archive (XML archive) `ar`.
将 `unordered_flat_set` `x` 的所有元素保存到归档（XML 归档）`ar` 中。
Requires:;; `value_type` is serializable (XML serializable), and it supports Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types).
要求：;; `value_type` 必须是可序列化的（支持 XML 序列化），并且支持 Boost.Serialization 的 `save_construct_data`/`load_construct_data` 协议（该协议由 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] 类型的自动支持）。
:1284
---
---
Loading an unordered_flat_set from an archive
从归档中加载 unordered_flat_set
Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
删除 `unordered_flat_set` `x` 中所有已存在的元素，并从归档（XML 归档）`ar` 中插入由 `ar` 所读取存储中保存的原始 `unordered_flat_set` `other` 元素的恢复副本。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`.
要求：;; `x.key_equal()` 在功能上等价于 `other.key_equal()`。
:1295
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---
Saving an iterator/const_iterator to an archive
将迭代器/常量迭代器保存到归档
Saves the positional information of an `iterator` (`const_iterator`) `it` to an archive (XML archive) `ar`. `it` can be and `end()` iterator.
将 `iterator`（`const_iterator`）`it` 的位置信息保存到归档（XML 归档）`ar` 中。`it` 可以是 `end()` 迭代器。
Requires:;; The `unordered_flat_set` `x` pointed to by `it` has been previously saved to `ar`, and no modifying operations have been issued on `x` between saving of `x` and saving of `it`.
要求：;; `it` 所指向的 `unordered_flat_set` `x` 此前已保存至 `ar`，并且在保存 `x` 和保存 `it` 之间未对 `x` 执行任何修改操作。
:1307
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---
Loading an iterator/const_iterator from an archive
从归档加载迭代器/常量迭代器
Makes an `iterator` (`const_iterator`) `it` point to the restored position of the original `iterator` (`const_iterator`) saved to the storage read by an archive (XML archive) `ar`.
使 `iterator`（`const_iterator`）`it` 指向保存到由归档（XML 归档）`ar` 读取的存储中的原始 `iterator`（`const_iterator`）的被恢复位置。
Requires:;; If `x` is the `unordered_flat_set` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
要求：;; 如果 `x` 是 `it` 所指向的 `unordered_flat_set`，则在加载 `x` 和加载 `it` 之间未对 `x` 执行任何修改操作。
English Chinese (Simplified Han script) Actions
reserve
保留
Deduction Guides
推导指引
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++ unordered_flat_set(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_flat_set(std::initializer_list<value_type> il, size_type n, const hasher&amp; hf, const allocator_type&amp; a); ```</value_type>
Erases the elements in the range from `first` to `last`.
删除从 `first` 到 `last` 范围内的元素。
Returns:;; The iterator following the erased elements - i.e. `last`. Throws:;; Nothing in this implementation (neither the `hasher` nor the `key_equal` objects are called).
返回：;; 被删除元素之后的迭代器，即 `last`。抛出：;; 在此实现中不抛出任何异常（既不会调用 `hasher` 也不会调用 `key_equal` 对象）。
swap
交换
Swaps the contents of the container with the parameter.
交换容器与参数的内容。
Constructors
构造函数
- 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.
- 它具有 `InputIterator` 模板参数，并且为该参数推导出的类型不符合输入迭代器的要求。- 它具有 `Allocator` 模板参数，并且为该参数推导出的类型不符合分配器的要求。- 它具有 `Hash` 模板参数，并且为该参数推导出的是整数类型或符合分配器要求的类型。- 它具有 `Pred` 模板参数，并且为该参数推导出的是符合分配器要求的类型。
A `size_­type` parameter type in a deduction guide refers to the `size_­type` member type of the container type deduced by the deduction guide. Its default value coincides with the default value of the constructor selected.
推导指引中的 `size_type` 参数类型指向由该推导指引所推导出的容器类型的 `size_type` 成员类型。其默认值与所选构造函数的默认值一致。
Equality Comparisons
相等性比较
operator
operator
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator==(const unordered_flat_set<Key, T, Hash, Pred, Alloc>& x, const unordered_flat_set<Key, T, Hash, Pred, Alloc>& y); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator==(const unordered_flat_set<key, t,="" hash,="" pred,="" alloc="">&amp; x, const unordered_flat_set<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
Return `true` 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 `true`。
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_flat_set<Key, T, Hash, Pred, Alloc>& x, unordered_flat_set<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(unordered_flat_set<key, t,="" hash,="" pred,="" alloc="">&amp; x, unordered_flat_set<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
Effects:;; `x.swap(y)` Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping.
效果：;; `x.swap(y)` 抛出：;; 除非 `key_equal` 或 `hasher` 在交换时抛出异常，否则不抛出任何异常。
```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_flat_set<K, T, H, P, A>::size_type erase_if(unordered_flat_set<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename unordered_flat_set<k, t,="" h,="" p,="" a="">::size_type erase_if(unordered_flat_set<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Traverses the container `c` and removes all elements for which the supplied predicate returns `true`.
遍历容器 `c` 并移除所有使给定谓词返回 `true` 的元素。
Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ```
返回：;; 被移除的元素数量。备注：;; 等价于：```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ```
Serialization
序列化
``unordered_flat_set``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.
`unordered_flat_set` 可以通过本库提供的 API，使用 link:../../../../../serialization/index.html[Boost.Serialization^] 进行归档/恢复。支持常规归档和 XML 归档。
Saving an unordered_flat_set to an archive
将 unordered_flat_set 保存到归档中
Saves all the elements of an `unordered_flat_set` `x` to an archive (XML archive) `ar`.
将 `unordered_flat_set` `x` 的所有元素保存到归档（XML 归档）`ar` 中。
Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
删除 `unordered_flat_set` `x` 中所有已存在的元素，并从归档（XML 归档）`ar` 中插入由 `ar` 所读取存储中保存的原始 `unordered_flat_set` `other` 元素的恢复副本。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`.
要求：;; `x.key_equal()` 在功能上等价于 `other.key_equal()`。
Saves the positional information of an `iterator` (`const_iterator`) `it` to an archive (XML archive) `ar`. `it` can be and `end()` iterator.
将 `iterator`（`const_iterator`）`it` 的位置信息保存到归档（XML 归档）`ar` 中。`it` 可以是 `end()` 迭代器。
Requires:;; The `unordered_flat_set` `x` pointed to by `it` has been previously saved to `ar`, and no modifying operations have been issued on `x` between saving of `x` and saving of `it`.
要求：;; `it` 所指向的 `unordered_flat_set` `x` 此前已保存至 `ar`，并且在保存 `x` 和保存 `it` 之间未对 `x` 执行任何修改操作。
Loading an iterator/const_iterator from an archive
从归档加载迭代器/常量迭代器
Makes an `iterator` (`const_iterator`) `it` point to the restored position of the original `iterator` (`const_iterator`) saved to the storage read by an archive (XML archive) `ar`.
使 `iterator`（`const_iterator`）`it` 指向保存到由归档（XML 归档）`ar` 读取的存储中的原始 `iterator`（`const_iterator`）的被恢复位置。

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Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.删除 `unordered_flat_set` `x` 中所有已存在的元素，并从归档（XML 归档）`ar` 中插入由 `ar` 所读取存储中保存的原始 `unordered_flat_set` `other` 元素的恢复副本。
06/05/2026
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String added in the repository
Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
Deletes all preexisting elements of an `unordered_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_set` `other` saved to the storage read by `ar`.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
No related strings found in the glossary.

String information

Flags
safe-html, strict-same
Unit identifier
54520
Source string location
:1288
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 363