Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Concurrent Flat Set (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: Returns:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket

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Key	English	Chinese (Simplified Han script)
	```c++ size_type count(const key_type& k) const; template<class K> size_type count(const K& k) const; ```	```c++ size_type count(const key_type& k) const; template<class k=""> size_type count(const K& k) const; ```</class>
	Returns:;; The number of elements with key equivalent to `k` (0 or 1). 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.	返回值：;; 键与`k`等价的元素数量（0 或 1）。备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
:1364	---	---
	contains	包含
	```c++ bool contains(const key_type& k) const; template<class K> bool contains(const K& k) const; ```	```c++ bool contains(const key_type& k) const; template<class k=""> bool contains(const K& k) const; ```</class>
	Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.	返回值：;; 布尔值，表示表中是否存在键与`k`相等的元素。备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
:1380	---	---
	Bucket Interface	桶接口
	bucket_count	bucket_count
	```c++ size_type bucket_count() const noexcept; ```	```c++ size_type bucket_count() const noexcept; ```
	Returns:;; The size of the bucket array.	返回值：;; 哈希桶数组的大小。
:1391	---	---
	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:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket_count() == 0`.	返回值：;; `static_cast<float>(size()) / static_cast<float>(bucket_count())`；若`bucket_count() == 0`，则返回`0`。</float></float>
:1403	---	---
	max_load_factor	max_load_factor
	```c++ float max_load_factor() const noexcept; ```	```c++ float max_load_factor() const noexcept; ```
	Returns:;; Returns the table's maximum load factor.	返回值：;; 返回哈希表的最大负载因子。
:1414	---	---
	Set max_load_factor	设置最大负载因子
	```c++ void max_load_factor(float z); ```	```c++ void max_load_factor(float z); ```
	Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_set`.	效果：;; 不执行任何操作，因为不允许用户修改此参数。保留该函数是为了与 `boost::unordered_set` 保持兼容。
:1424	---	---
	max_load	max_load（最大负载）
	```c++ size_type max_load() const noexcept; ```	```c++ size_type max_load() const noexcept; ```
	Returns:;; The maximum number of elements the table can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the table's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.	返回值：;; 哈希表在不进行重哈希的前提下可容纳的最大元素数量（假设不会再删除任何元素）。备注：;; 构造完成、重哈希或清空后，哈希表的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下执行删除操作后，该数值可能会降低。在存在并发插入操作时，返回的值可能无法准确反映执行后哈希表的真实状态。
:1441	---	---
	rehash	重哈希
	```c++ void rehash(size_type n); ```	```c++ void rehash(size_type n); ```

	English	Chinese (Simplified Han script)	Actions
	clear	清空
	```c++ void clear() noexcept; ```	```c++ void clear() noexcept; ```
	Erases all elements in the table.	清空表中的所有元素。
	Move-inserts all the elements from `source` whose key is not already present in `*this`, and erases them from `source`.	将`source`中所有键尚未存在于`*this`中的元素移动插入，并从`source`中删除这些元素。
	Returns:;; The number of elements inserted. Concurrency:;; Blocking on `*this` and `source`.	返回值：;; 插入的元素数量。并发：;; 阻塞`*this`和`source`。
	Observers	观察器
	get_allocator	get_allocator
	``` allocator_type get_allocator() const noexcept; ```	``` allocator_type get_allocator() const noexcept; ```
	Returns:;; The number of elements with key equivalent to `k` (0 or 1). 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. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.	返回值：;; 键与`k`等价的元素数量（0 或 1）。备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时才参与重载决议。标准库假定 `Hash` 可同时接受 `K` 与 `Key` 类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。在存在并发插入操作时，返回的值可能无法准确反映执行后表的真实状态。</class>
	bucket_count	bucket_count
	```c++ size_type bucket_count() const noexcept; ```	```c++ size_type bucket_count() const noexcept; ```
	Returns:;; The size of the bucket array.	返回值：;; 哈希桶数组的大小。
	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:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket_count() == 0`.	返回值：;; `static_cast<float>(size()) / static_cast<float>(bucket_count())`；若`bucket_count() == 0`，则返回`0`。</float></float>
	```c++ float max_load_factor() const noexcept; ```	```c++ float max_load_factor() const noexcept; ```
	Returns:;; Returns the table's maximum load factor.	返回值：;; 返回哈希表的最大负载因子。
	Set max_load_factor	设置最大负载因子
	```c++ void max_load_factor(float z); ```	```c++ void max_load_factor(float z); ```
	Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_set`.	效果：;; 不执行任何操作，因为不允许用户修改此参数。保留该函数是为了与 `boost::unordered_set` 保持兼容。
	Returns:;; The maximum number of elements the table can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the table's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.	返回值：;; 哈希表在不进行重哈希的前提下可容纳的最大元素数量（假设不会再删除任何元素）。备注：;; 构造完成、重哈希或清空后，哈希表的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下执行删除操作后，该数值可能会降低。在存在并发插入操作时，返回的值可能无法准确反映执行后哈希表的真实状态。
	rehash	重哈希
	```c++ void rehash(size_type n); ```	```c++ void rehash(size_type n); ```
	Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the table's hash function or comparison function. Concurrency:;; Blocking on `*this`. ---	抛出：;; 若抛出异常，函数无任何效果（哈希函数或比较函数抛出的异常除外）。并发：;; 阻塞`*this`。 ---
	```c++ void reserve(size_type n); ```	```c++ void reserve(size_type n); ```
	Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`.	等价于 `a.rehash(ceil(n / a.max_load_factor()))`。
	Statistics	统计信息
	get_stats	get_stats
	```c++ stats get_stats() const; ```	```c++ stats get_stats() const; ```

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