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```c++ size_type max_bucket_count() const noexcept; ```
```c++ size_type max_bucket_count() const noexcept; ```
Returns:;; An upper bound on the number of buckets.
返回：;; 桶数量的上限。
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bucket_size
桶大小
```c++ size_type bucket_size(size_type n) const; ```
```c++ size_type bucket_size(size_type n) const; ```
Requires:;; `n < bucket_count()` Returns:;; The number of elements in bucket `n`.
要求：;; `n &lt; bucket_count()`返回：;; 桶 `n` 中的元素个数。
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bucket
桶
```c++ size_type bucket(const key_type& k) const; template<class K> size_type bucket(const K& k) const; ```
```c++ size_type bucket(const key_type&amp; k) const; template<class k=""> size_type bucket(const K&amp; k) const; ```</class>
Returns:;; The index of the bucket which would contain an element with key `k`. Postconditions:;; The return value is less than `bucket_count()`. Notes:;; The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.
返回：;; 包含键 `k` 的元素的桶索引。
后置条件：;; 返回值小于 `bucket_count()`。
备注：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef 时，`template<class k="">` 重载才会参与重载决议。库假定 `Hash` 可同时以 `K` 和 `Key` 类型调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型的开销。</class>
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begin
begin
```c++ local_iterator begin(size_type n); const_local_iterator begin(size_type n) const; ```
```c++ local_iterator begin(size_type n); const_local_iterator begin(size_type n) const; ```
Requires:;; `n` shall be in the range `[0, bucket_count())`. Returns:;; A local iterator pointing the first element in the bucket with index `n`.
要求：;; `n` 应在 `[0, bucket_count())` 范围内。
返回：;; 指向索引为 `n` 的桶中第一个元素的局部迭代器。
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end
end
```c++ local_iterator end(size_type n); const_local_iterator end(size_type n) const; ```
```c++ local_iterator end(size_type n); const_local_iterator end(size_type n) const; ```
Requires:;; `n` shall be in the range `[0, bucket_count())`. Returns:;; A local iterator pointing the 'one past the end' element in the bucket with index `n`.
要求：;; `n` 应在 `[0, bucket_count())` 范围内。
返回：;; 指向索引为 `n` 的桶中“尾后”元素的局部迭代器。
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cbegin
cbegin
```c++ const_local_iterator cbegin(size_type n) const; ```
```c++ const_local_iterator cbegin(size_type n) const; ```
Requires:;; `n` shall be in the range `[0, bucket_count())`. Returns:;; A constant local iterator pointing the first element in the bucket with index `n`.
要求：;; `n` 应在 `[0, bucket_count())` 范围内。
返回：;; 指向索引为 `n` 的桶中第一个元素的常量局部迭代器。
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cend
cend
```c++ const_local_iterator cend(size_type n) const; ```
```c++ const_local_iterator cend(size_type n) const; ```
Requires:;; `n` shall be in the range `[0, bucket_count())`. Returns:;; A constant local iterator pointing the 'one past the end' element in the bucket with index `n`.
要求：;; `n` 应在 `[0, bucket_count())` 范围内。
返回：;; 指向索引为 `n` 的桶中“尾后”元素的常量局部迭代器。
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Hash Policy
哈希策略
load_factor
负载因子
```c++ float load_factor() const noexcept; ```
```c++ float load_factor() const noexcept; ```
Returns:;; The average number of elements per bucket.
返回：;; 每个桶的平均元素个数。
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
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Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。

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:1556
06/05/2026
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06/05/2026
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Key
:1556
Flags
safe-html, strict-same
Unit identifier
55789
Source string location
:1556
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_map_zh_Hans.adoc, string 407