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`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
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Class Template unordered_flat_map
类模板 unordered++_++flat++_++map
:idprefix: unordered_flat_map_
:idprefix: unordered_flat_map_
`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
`boost::unordered++_++flat++_++map` —— 一种开放寻址的无序关联容器，用于将唯一键与另一个值关联。
The performance of `boost::unordered_flat_map` is much better than that of `boost::unordered_map` or other implementations of `std::unordered_map`. Unlike standard unordered associative containers, which are node-based, the elements of a `boost::unordered_flat_map` are held directly in the bucket array, and insertions into an already occupied bucket are diverted to available buckets in the vicinity of the original position. This type of data layout is known as _open addressing_.
`boost::unordered++_++flat++_++map` 的性能远优于 `boost::unordered++_++map` 或其他 `std::unordered++_++map` 的实现。与基于节点的标准无序关联容器不同， `boost::unordered++_++flat++_++map` 的元素直接存储在桶数组中，且当元素被插入到已被占用的桶时，会将其重定向到原始位置附近的可用桶。这种数据布局类型称为__开放寻址法__。
As a result of its using open addressing, the interface of `boost::unordered_flat_map` deviates in a number of aspects from that of `boost::unordered_map`/`std::unordered_map`:
由于采用开放寻址法， `boost::unordered++_++flat++_++map` 的接口在多个方面与 `boost::unordered++_++map` / `std::unordered++_++map` 不同：
- `value_type` must be move-constructible. - Pointer stability is not kept under rehashing. - `begin()` is not constant-time. - There is no API for bucket handling (except `bucket_count`) or node extraction/insertion. - The maximum load factor of the container is managed internally and can't be set by the user.
- `value++_++type` 必须支持移动构造。 - 在重哈希的过程中，指针稳定性无法保持。 - `begin()` 不是常数时间复杂度操作。 - 未提供用于桶管理（除 `bucket++_++count` 外）或节点提取/插入的 API。 - 容器的最大负载因子由内部管理，用户无法进行设置。
Other than this, `boost::unordered_flat_map` is mostly a drop-in replacement of node-based standard unordered associative containers.
除此之外， `boost::unordered++_++flat++_++map` 基本可完全替代基于节点的标准无序关联容器。
Synopsis
概要
:282
---
---
Description
描述
*Template Parameters*
*模板参数*
_Key_
_键_
`std::pair<const Key, T>` must be https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container 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 container.
`std::pair<const key,="" t="">` 必须能从任何可转换为它的 `std::pair` 对象满足对容器的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^] 要求，并且还必须满足对容器的 https://en.cppreference.com/w/cpp/named_req/Erasable[可擦除^] 要求。</const>
_T_
_T_
_Hash_
_Hash_
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`.
一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数并返回 `std::size_t` 类型的值。
_Pred_
_Pred_
A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type `bool`.
一个二元函数对象，在 `Key` 类型的值上诱导出等价关系。它接受两个 `Key` 类型的参数并返回 `bool` 类型的值。
English Chinese (Simplified Han script) Actions
```
```
`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
`boost::unordered++_++flat++_++map` —— 一种开放寻址的无序关联容器，用于将唯一键与另一个值关联。
Other than this, `boost::unordered_flat_map` is mostly a drop-in replacement of node-based standard unordered associative containers.
除此之外， `boost::unordered++_++flat++_++map` 基本可完全替代基于节点的标准无序关联容器。
Synopsis
概要
Description
描述
*Template Parameters*
*模板参数*
_Key_
_键_
`std::pair<const Key, T>` must be https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container 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 container.
`std::pair<const key,="" t="">` 必须能从任何可转换为它的 `std::pair` 对象满足对容器的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^] 要求，并且还必须满足对容器的 https://en.cppreference.com/w/cpp/named_req/Erasable[可擦除^] 要求。</const>
_T_
_T_
_Hash_
_Hash_
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`.
一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数并返回 `std::size_t` 类型的值。
_Pred_
_Pred_
A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type `bool`.
一个二元函数对象，在 `Key` 类型的值上诱导出等价关系。它接受两个 `Key` 类型的参数并返回 `bool` 类型的值。
_Allocator_
_Allocator_
If `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<Hash>::value` is `true`, the hash function is used as-is; otherwise, a bit-mixing post-processing stage is added to increase the quality of hashing at the expense of extra computational cost.
若 link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[`hash++_++is++_++avalanching`]`++&lt;++Hash++&gt;++::value` 为 `true` ，则直接使用哈希函数；否则，会添加一个位混合后处理阶段以提高哈希质量，但会牺牲额外的计算成本。
Configuration Macros
配置宏
Serialization
序列化
``unordered_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.
`unordered++_++flat++_++map` 可通过本组件库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization] 进行归档/检索。支持常规归档与 XML 归档两种格式。
Saving an unordered_flat_map to an archive
将 unordered++_++flat++_++map 保存到归档
Saves all the elements of an `unordered_flat_map` `x` to an archive (XML archive) `ar`.
将 `unordered++_++flat++_++map` `x` 的所有元素保存到归档（XML 归档） `ar` 。
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).
要求：std::remove_const<key_type>::type 和 std::remove_const<mapped_type>::type 必须满足可序列化要求（XML 可序列化），且需要支持 Boost.Serialization 的 save_construct_data / load_construct_data 协议（该协议自动支持 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造] 要求）。</mapped_type></key_type>
Loading an unordered_flat_map from an archive
从归档加载 unordered++_++flat++_++map
Deletes all preexisting elements of an `unordered_flat_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_flat_map` `other` saved to the storage read by `ar`.
删除 `unordered++_++flat++_++map` 容器 `x` 中所有已存在的元素，并从归档（XML 归档） `ar` 中插入原始 `unordered++_++flat++_++map` 容器 `other` 的元素副本，这些副本是从 `ar` 所读取的存储中恢复的。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`.
要求;; `x.key++_++equal()` 需要在功能上等价于 `other.key++_++equal()` 。
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` ）常量迭代器 `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_map` `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++_++map` 容器 `x` 必须先前已保存至 `ar` ，且在保存 `x` 与保存 `it` 期间不得对 `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` 指向原始 `iterator` （ `const++_++iterator` ）所恢复的位置。该原始迭代器已被保存到由归档（XML 归档） `ar` 读取的存储中。
Requires:;; If `x` is the `unordered_flat_map` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
要求;; 若 `x` 是 `it` 所指向的 `unordered++_++flat++_++map` 容器，则在加载 `x` 与加载 `it` 期间不得对 `x` 执行任何修改操作。

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`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.++_++flat++_++map` —— 一种开放寻址的无序关联容器，用于将唯一键与另一个值关联。
06/05/2026
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String added in the repository
`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
`boost::unordered_flat_map` — An open-addressing unordered associative container that associates unique keys with another value.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
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String information

Flags
safe-html, strict-same
Unit identifier
54961
Source string location
:6
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_map_zh_Hans.adoc, string 3