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A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `一种一元函数对象类型，用作Key类型的哈希函数。它接受单个Key类型的参数，并返回std::size_t`.类型的值。
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_Hash_
_Hash_
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_T_
_T_
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`std::pair<const Key, T>` must be https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the table from any `std::pair` object convertible to it, and it also must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the table.
`std::pair<const Key, T>` must bekey,="" t="">` 必须能够从任何可转换为其的 `std::pair` 对象出发，在表中进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the table from any `std::pair` object convertible to it, and it also must be构造，并且也必须可以从表中进行 https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the table.擦除。</const>
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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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---
---
:329
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Synopsis
Synopsis概要
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The internal data structure of `boost::concurrent_flat_map` is similar to that of `boost::unordered_flat_map`. 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_map` is similar to that of `boost::unordered_flat_map`. As a result of its using open-addressing techniques,`boost::concurrent++_++flat++_++map` 的内部数据结构与 `boost::unordered++_++flat++_++map` 类似。由于采用开放寻址技术， `value_++_++type` must be move-constructible and pointer stability is not kept under rehashing.必须支持移动构造，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_map` 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 and modification are done through user-provided _visitation functions_ that are passed to `concurrent_flat_map` 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_map` does not model the standard尽管它充当容器的角色，boost::concurrent_flat_map 并未遵循标准 C++ 的 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 and modification are done through user-provided _visitation functions_ that are passed to `concurrent_flat_map` operations where they are executed internally in a controlled fashion. Such visitation-based API allows for low-contention concurrent usage scenarios.概念。特别地，它不提供迭代器及相关操作（例如 begin、end 等）。元素的访问和修改是通过用户提供的 访问函数 来完成的，这些函数被传递给 concurrent_flat_map 的操作，并以受控的方式在内部执行。这种基于访问的 API 能够实现低竞争并发的使用场景。
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`boost::concurrent_flat_map` — A hash table that associates unique keys with another value and allows for concurrent element insertion, erasure, lookup and access without external synchronization mechanisms.
`boost::concurrent_flat_map` — A hash table that associates unique keys with another value and allows for concurrent element insertion, erasure, lookup and access without external synchronization mechanisms.一种哈希表，将唯一键与对应值关联，并允许在无需外部同步机制的情况下进行并发的元素插入、删除、查找和访问。
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:idprefix: concurrent_flat_map_
:idprefix: concurrent_flat_map_
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Class Template concurrent_flat_map
Class Template类模板 concurrent_flat_map
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[#concurrent_flat_map]
[#concurrent_flat_map]
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Processed 37 strings from the uploaded files (skipped: 0, not found: 0, updated: 37).
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xref:reference/concurrent_node_set.adoc[Class Template +++<code style="color: inherit;">+++concurrent_node_set+++</code>+++]
xref:reference/concurrent_node_set.adoc[Class Template +++<code style="color: inherit;">+++concurrent_node_set+++</code>+++]
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xref:reference/header_concurrent_node_set.adoc[+++<code style="color: inherit;">+++<boost/unordered/concurrent_node_set.hpp>+++</code>+++ Synopsis]
xref:reference/header_concurrent_node_set.adoc[+++<code style="color: inherit;">+++<boost/ unordered/="" concurrent_node_set.hpp="">+++</boost></code>+++ Synopsis概要]
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xref:reference/header_concurrent_node_set_fwd.adoc[+++<code style="color: inherit;">+++<boost/unordered/concurrent_node_set_fwd.hpp>+++</code>+++ Synopsis]
xref:reference/header_concurrent_node_set_fwd.adoc[+++<code style="color: inherit;">+++<boost/ unordered/="" concurrent_node_set_fwd.hpp="">+++</boost></code>+++ Synopsis概要]
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xref:reference/concurrent_node_map.adoc[Class Template +++<code style="color: inherit;">+++concurrent_node_map+++</code>+++]
xref:reference/concurrent_node_map.adoc[Class Template类模板 +++<code style="color: inherit;">+++concurrent_node_map+++</code>+++]
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