Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Unordered Map (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: Requires:;; `n < bucket_count()` Returns:;; The number of elements in …

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Key	English	Chinese (Simplified Han script)
	at	at
	```c++ mapped_type& at(const key_type& k); const mapped_type& at(const key_type& k) const; template<class K> mapped_type& at(const K& k); template<class K> const mapped_type& at(const K& k) const; ```	```c++ mapped_type& at(const key_type& k); const mapped_type& at(const key_type& k) const; template<class k=""> mapped_type& at(const K& k); template<class k=""> const mapped_type& at(const K& k) const; ```</class></class>
	Returns:;; A reference to `x.second` where `x` is the (unique) element whose key is equivalent to `k`. Throws:;; An exception object of type `std::out_of_range` if no such element is present. Notes:;; The `template<class K>` overloads only participate 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：;; 指向 `x.second` 的引用，其中 `x` 是键与 `k` 等价的（唯一）元素。抛出：;; 如果不存在这样的元素，则抛出 `std::out_of_range` 类型的异常对象。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>
:1495	---	---
	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 number of buckets.	返回：;; 桶的数量。
:1507	---	---
	max_bucket_count	max_bucket_count
	```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。
:1517	---	---
	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 < bucket_count()`返回：;; 桶 `n` 中的元素个数。
:1528	---	---
	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& k) const; template<class k=""> size_type bucket(const K& 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>
:1541	---	---
:1543	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。
:1554	---	---
:1556	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。
:1566	---	---
:1568	cbegin	cbegin
	```c++ const_local_iterator cbegin(size_type n) const; ```	```c++ const_local_iterator cbegin(size_type n) const; ```

	English	Chinese (Simplified Han script)	Actions
	get_allocator	get_allocator
	hash_function	哈希函数
	Returns:;; The container's hash function.	返回：;; 容器的哈希函数。
	Lookup	查找
	find	find
	```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>
	at	at
	Returns:;; The number of buckets.	返回：;; 桶的数量。
	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:;; Changes the container's maximum load factor, using `z` as a hint.	效果：;; 改变容器的最大负载因子，以 `z` 作为提示。
	```c++ void reserve(size_type n); ```	```c++ void reserve(size_type n); ```
	Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.	与 `rehash` 类似，此函数可用于增加或减少容器中桶的数量。
	Returns:;; An upper bound on the number of buckets.	返回：;; 桶数量的上限。
	```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 < bucket_count()`返回：;; 桶 `n` 中的元素个数。
	bucket	桶
	This function does not copy or move any elements and instead simply relocates the nodes from `source` into `*this`.	此函数不会复制或移动任何元素，而只是将节点从 `source` 重新定位到 `*this` 中。
	Pointers and references to transferred elements remain valid.	指向被转移元素的指针和引用保持有效。
	Invalidates iterators to transferred elements.	使指向被转移元素的迭代器失效。
	--	--
	Observers	观察器
	``` allocator_type get_allocator() const; ```	``` allocator_type get_allocator() const; ```
	``` hasher hash_function() const; ```	``` hasher hash_function() const; ```
	``` key_equal key_eq() const; ```	``` key_equal key_eq() const; ```
	Returns:;; The container's key equality predicate	返回：;; 容器的键相等谓词。
	```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。
	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。
	Globally define this macro to support loading of ``unordered_map``s saved to a Boost.Serialization archive with a version of Boost prior to Boost 1.84.	全局定义此宏以支持加载由 Boost 1.84 之前版本的 Boost 保存到 Boost.Serialization 归档中的 `unordered_map`。

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