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`Key` must be https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] into the container
`Key` must be https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] into the container 必须满足
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_Key_
_Key键_
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*Template Parameters*
*Template Parameters模板参数*
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Description
Description描述
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---
---
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Synopsis
Synopsis概要
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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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The “doc/modules/ROOT/pages/reference/concurrent_flat_set_zh_Hans.adoc” file was changed. 06/05/2026
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File “doc/modules/ROOT/pages/reference/concurrent_flat_set_zh_Hans.adoc” was added. 06/05/2026
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Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
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Deletes all preexisting elements of a `concurrent_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_set` `other` saved to the storage read by `ar`.
Deletes all preexisting elements of a `concurrent_flat_set` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_set` `other` saved to the storage read by `ar`.
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Loading an concurrent_flat_set from an archive
Loading an concurrent_flat_set from an archive
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---
---
:1598
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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). Concurrency:;; Blocking on `x`.
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). Concurrency:;; Blocking on `x`.
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Saves all the elements of a `concurrent_flat_set` `x` to an archive (XML archive) `ar`.
Saves all the elements of a `concurrent_flat_set` `x` to an archive (XML archive) `ar`.
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