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The internal data structure of `boost::concurrent_flat_set` is similar to that of `boost::unordered_flat_set`. As a result of its using open-addressing techniques, `value_type` must be move-constructible and pointer stability is not kept under rehashing.
The internal data structure of `boost::concurrent_flat_set` is similar to that of `boost::unordered_flat_set`. As a result of its using open-addressing techniques,`boost::concurrent++_++flat++_++set` 的内部数据结构类似于 `boost::unordered++_++flat++_++set` 。由于其采用开放寻址技术， `value_++_++type` must be move-constructible and pointer stability is not kept under rehashing.必须满足可移动构造要求，且在重哈希过程中无法保持指针稳定性。
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Even though it acts as a container, `boost::concurrent_flat_set` does not model the standard C++ https://en.cppreference.com/w/cpp/named_req/Container[Container^] concept. In particular, iterators and associated operations (`begin`, `end`, etc.) are not provided. Element access is done through user-provided _visitation functions_ that are passed to `concurrent_flat_set` operations where they are executed internally in a controlled fashion. Such visitation-based API allows for low-contention concurrent usage scenarios.
Even though it acts as a container, `boost::concurrent_flat_set` does not model the standard C++ https://en.cppreference.com/w/cpp/named_req/Container[Container^] concept. In particular, iterators and associated operations (尽管 `boost::concurrent++_++flat++_++set` 具备容器特性，但它并不符合 C{plus}{plus}标准中的 https://en.cppreference.com/w/cpp/named_req/Container[容器] 概念。具体而言，该容器未提供迭代器及相关操作（如 `begin`, 、 `end`, etc.) are not provided. Element access is done through user-provided _visitation functions_ that are passed to `concurrent_flat_set` operations where they are executed internally in a controlled fashion. Such visitation-based API allows for low-contention concurrent usage scenarios. 等）。元素访问通过用户提供的__访问函数__实现，这些函数被传递至 `concurrent++_++flat++_++set` 操作中，并在其内部以受控方式执行。这种基于访问机制的 API 设计能够有效支持低争用的并发应用场景。
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`boost::concurrent_flat_set` — A hash table that stores unique values and allows for concurrent element insertion, erasure, lookup and access without external synchronization mechanisms.
`boost::concurrent_flat_set` — A hash table that stores unique values and allows for concurrent element insertion, erasure, lookup and access without external synchronization mechanisms.++_++flat++_++set` —— 一种存储唯一值的哈希表，它支持并发的元素插入、删除、查找及访问操作，且无需外部同步机制。
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:idprefix: concurrent_flat_set_
:idprefix: concurrent_flat_set_
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Class Template concurrent_flat_set
Class Template concurrent_flat_类模板 concurrent++_++flat++_++set
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[#concurrent_flat_set]
[#concurrent_flat_set]
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Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
Requires:要求;; `x.key_++_++equal()` is functionally equivalent to需要在功能上等价于 `other.key_++_++equal()`. Concurrency:;; Blocking on 。 并发性;; 阻塞于 `x`. 。
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Deletes all preexisting elements of a `concurrent_flat_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_map` `other` saved to the storage read by `ar`.
Deletes all preexisting elements of a `concurrent_flat_删除 `concurrent++_++flat++_++map` 容器 `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_中所有已存在的元素，并从归档（XML 归档） `ar` 中插入原始 `concurrent++_++flat++_++map` 容器 `other` saved to the storage read by `ar`.的元素副本，这些副本是从 `ar` 所读取的存储中恢复的。
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Loading an concurrent_flat_map from an archive
Loading an concurrent_flat_map from an archive从归档加载concurrent++_++flat++_++map
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---
---
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Requires:;; `std::remove_const<key_type>::type` and `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). Concurrency:;; Blocking on `x`.
Requires:;; 要求：`std::remove_const<key_type>::type` and和 `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support必须是可序列化的（支持 XML 序列化），并且它们支持 Boost.Serialization 的 `save_construct_data`/ / `load_construct_data` protocol (automatically suported by 协议（https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). Concurrency:;; Blocking on `x`.可默认构造^] 类型自动支持该协议）。并发：阻塞 `x`。</mapped_type></key_type>
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Saves all the elements of a `concurrent_flat_map` `x` to an archive (XML archive) `ar`.
Saves all the elements of a `concurrent_flat_将 `concurrent++_++flat++_++map` 容器 `x` to an archive (XML archive)的所有元素保存到归档（XML归档） `ar`. 中。
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Saving an concurrent_flat_map to an archive
Saving an concurrent_flat_map to an archive将concurrent++_++flat++_++map保存到归档
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``concurrent_flat_map``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.
``concurrent_flat_map``s can be archived/retrieved by means of++_++flat++_++map` 可通过本组件库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.进行归档/检索。支持常规归档与 XML 归档两种格式。
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Serialization
Serialization序列化
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Equivalent to [listing,subs="+macros,+quotes"]
Equivalent to等价于 [listing,subs="+macros,+quotes"]
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```c++ template<class K, class T, class H, class P, class A, class Predicate> typename concurrent_flat_map<K, T, H, P, A>::size_type erase_if(concurrent_flat_map<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class K,k,="" class T, class H, class P, class A, class P="" t,="" h,="" p,="" a,="" predicate=""> typename concurrent_flat_map<K, T, H, P, Ak, t,="" h,="" p,="" a="">::size_type erase_if(concurrent_flat_map<K, T, H, P, A>&k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
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erase_if
erase_if
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---
---
:1792
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