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An iterator whose value type is `value_type`.
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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`.
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_
An allocator whose value type is the same as the container's value type.
一个分配器，其值类型与容器的值类型相同。
Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
支持使用 https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[花式指针^] 的分配器。
The elements of the container are held into an internal _bucket array_. An element is inserted into a bucket determined by its hash code, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.
容器的元素存储在内部的__桶数组__中。元素根据其哈希码被插入到对应的桶中，但如果该桶已被占用（即发生__冲突__），则会使用原始位置附近可用的桶。
The size of the bucket array can be automatically increased by a call to `insert`/`emplace`, or as a result of calling `rehash`/`reserve`. The _load factor_ of the container (number of elements divided by number of buckets) is never greater than `max_load_factor()`, except possibly for small sizes where the implementation may decide to allow for higher loads.
桶数组的大小可通过调用 `insert` / `emplace` 自动增加，也可通过调用 `rehash` / `reserve` 来调整。容器的__负载因子__（元素数量与桶数量的比值）始终不会超过 `max++_++load++_++factor()` ，但在小规模数据情况下，实现可能允许更高的负载因子。
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。
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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
`BOOST_UNORDERED_ENABLE_STATS`
`BOOST++_++UNORDERED++_++ENABLE++_++STATS`
Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the container. Note that this option decreases the overall performance of many operations.
全局定义此宏，以启用容器的 xref:reference/stats.adoc#stats[统计计算] 功能。请注意，此选项会降低许多操作的总体性能。
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---
---
Typedefs
类型定义
An iterator whose value type is `value_type`.
一种迭代器，其值类型为 `value++_++type` 。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
Convertible to `const_iterator`.
可转换为 `const++_++iterator` 。
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---
A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value++_++type` 。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
Constructors
构造函数
Default Constructor
默认构造函数
```c++ unordered_flat_map(); ```
```c++ unordered_flat_map(); ```
Constructs an empty container using `hasher()` as the hash function, `key_equal()` as the key equality predicate and `allocator_type()` as the allocator.
构造一个空容器，使用 `hasher()` 作为哈希函数、 `key++_++equal()` 作为键相等性谓词、以及 `allocator++_++type()` 作为分配器。
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Postconditions:;; `size() == 0` Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0` 要求：若使用默认参数，则 `hasher`、`key_equal` 和 `allocator_type` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
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Bucket Count Constructor
桶数构造函数
```c++ explicit unordered_flat_map(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
```c++ explicit unordered_flat_map(size_type n, const hasher&amp; hf = hasher(), const key_equal&amp; eql = key_equal(), const allocator_type&amp; a = allocator_type()); ```
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, and `a` as the allocator.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数、 `eql` 作为键相等性谓词、以及 `a` 作为分配器。
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Postconditions:;; `size() == 0` Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0` 要求：若使用默认参数，则 `hasher`、`key_equal` 和 `allocator_type` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 要求。
English Chinese (Simplified Han script) Actions
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
Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the container. Note that this option decreases the overall performance of many operations.
全局定义此宏，以启用容器的 xref:reference/stats.adoc#stats[统计计算] 功能。请注意，此选项会降低许多操作的总体性能。
Typedefs
类型定义
An iterator whose value type is `value_type`.
一种迭代器，其值类型为 `value++_++type` 。
Default Constructor
默认构造函数
```c++ unordered_flat_map(); ```
```c++ unordered_flat_map(); ```
Constructs an empty container using `hasher()` as the hash function, `key_equal()` as the key equality predicate and `allocator_type()` as the allocator.
构造一个空容器，使用 `hasher()` 作为哈希函数、 `key++_++equal()` 作为键相等性谓词、以及 `allocator++_++type()` 作为分配器。
Bucket Count Constructor
桶数构造函数
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, and `a` as the allocator.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数、 `eql` 作为键相等性谓词、以及 `a` 作为分配器。
Iterator Range Constructor
迭代器范围构造函数
```c++ unordered_flat_map(unordered_flat_map const& other); ```
```c++ unordered_flat_map(unordered_flat_map const&amp; other); ```
The copy constructor. Copies the contained elements, hash function, predicate and allocator.
复制构造函数。复制所含元素、哈希函数、谓词和分配器。
If `Allocator::select_on_container_copy_construction` exists and has the right signature, the allocator will be constructed from its result.
若 `Allocator::select++_++on++_++container++_++copy++_++construction` 存在且签名正确，则将根据其结果来构造分配器。
Requires:;; `value_type` is copy constructible
要求：`value_type` 需满足可复制构造要求。
Move Constructor
移动构造函数
```c++ unordered_flat_map(unordered_flat_map&& other); ```
```c++ unordered_flat_map(unordered_flat_map&amp;&amp; other); ```
Iterator Range Constructor with Allocator
带分配器的迭代器范围构造函数
Constructs an empty container using `a` as the allocator, with the default hash function and key equality predicate and inserts the elements from `[f, l)` into it.
使用 `a` 作为分配器构造一个空容器，使用默认的哈希函数和键相等谓词，并将 `[f, l)` 中的元素插入其中。

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An iterator whose value type is `value_type`.
An iterator whose value type is一种迭代器，其值类型为 `value_++_++type`. 。
06/05/2026
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An iterator whose value type is `value_type`.
An iterator whose value type is `value_type`.
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
54989
Source string location
:342
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 31