Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Unordered Flat Set (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: ```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```

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Key	English	Chinese (Simplified Han script)
	Size and Capacity	大小与容量
	empty	空
	```c++ [[nodiscard]] bool empty() const noexcept; ```	```c++ [[nodiscard]] bool empty() const noexcept; ```
	Returns:;; `size() == 0`	返回：;; `size() == 0`
:672	---	---
	size	大小
	```c++ size_type size() const noexcept; ```	```c++ size_type size() const noexcept; ```
	Returns:;; `std::distance(begin(), end())`	返回：;; `std::distance(begin(), end())`
:683	---	---
	max_size	max_size
	```c++ size_type max_size() const noexcept; ```	```c++ size_type max_size() const noexcept; ```
	Returns:;; `size()` of the largest possible container.	返回：;; 可能的最大容器的 `size()`。
:694	---	---
	Modifiers	修改器
	emplace	原地构造
	```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```	```c++ template<class... args=""> std::pair<iterator, bool=""> emplace(Args&&... args); ```</iterator,></class...>
:703	Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent key.	当且仅当容器中不存在具有等价键的元素时，才插入一个使用参数 `args` 构造的对象。
:706	Requires:;; `value_type` is constructible from `args`. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, pointers and references, but only if the insert causes the load to be greater than the maximum load. +	要求：;; `value_type` 可以从 `args` 构造。返回：;; 如果进行了插入，则返回类型的 `bool` 分量为 `true`。如果进行了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。抛出：;; 如果除调用 `hasher` 之外的操作抛出异常，则该函数无效。备注：;; 可能会使迭代器、指针和引用失效，但仅当插入导致负载因子大于最大负载因子时才会发生。
:713	---	---
	emplace_hint	emplace_hint
	```c++ template<class... Args> iterator emplace_hint(const_iterator position, Args&&... args); ```	```c++ template<class... args=""> iterator emplace_hint(const_iterator position, Args&&... args); ```</class...>
:720	Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent key.	当且仅当容器中不存在具有等价键的元素时，才插入一个使用参数 `args` 构造的对象。
	`position` is a suggestion to where the element should be inserted. This implementation ignores it.	`position` 是关于元素应该插入位置的一个提示。此实现会忽略它。
:725	Requires:;; `value_type` is constructible from `args`. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, pointers and references, but only if the insert causes the load to be greater than the maximum load. +	要求：;; `value_type` 可以从 `args` 构造。返回：;; 如果进行了插入，则返回类型的 `bool` 分量为 `true`。如果进行了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。抛出：;; 如果除调用 `hasher` 之外的操作抛出异常，则该函数无效。备注：;; 可能会使迭代器、指针和引用失效，但仅当插入导致负载大于最大负载时才会发生。
:732	---	---
	Copy Insert	复制插入
	```c++ std::pair<iterator, bool> insert(const value_type& obj); ```	```c++ std::pair<iterator, bool=""> insert(const value_type& obj); ```</iterator,>
:739	Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.	当且仅当容器中不存在具有等价键的元素时，才将 `obj` 插入容器中。
:742	Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, pointers and references, but only if the insert causes the load to be greater than the maximum load.	要求：;; `value_type` 必须是 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]。返回：;; 如果进行了插入，则返回类型的 `bool` 分量为 `true`。如果进行了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。抛出：;; 如果除调用 `hasher` 之外的操作抛出异常，则该函数无效。备注：;; 可能会使迭代器、指针和引用失效，但仅当插入导致负载大于最大负载时才会发生。
:749	---	---
	Move Insert	移动插入

	English	Chinese (Simplified Han script)	Actions
	Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()`	Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()`
	merge	合并
	```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`. 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：;; 键与 `k` 等价的元素个数。备注：;; `template<class k="">` 重载仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef 时才会参与重载决议。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>
	```c++ std::pair<iterator, iterator> equal_range(const key_type& k); std::pair<const_iterator, const_iterator> equal_range(const key_type& k) const; template<class K> std::pair<iterator, iterator> equal_range(const K& k); template<class K> std::pair<const_iterator, const_iterator> equal_range(const K& k) const; ```	```c++ std::pair<iterator, iterator=""> equal_range(const key_type& k); std::pair<const_iterator, const_iterator=""> equal_range(const key_type& k) const; template<class k=""> std::pair<iterator, iterator=""> equal_range(const K& k); template<class k=""> std::pair<const_iterator, const_iterator=""> equal_range(const K& k) const; ```</const_iterator,></class></iterator,></class></const_iterator,></iterator,>
	Bucket Interface	桶接口
	Returns:;; The size of the bucket array.	返回：;; 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：;; `static_cast<float>(size())/static_cast<float>(bucket_count())`，如果 `bucket_count() == 0` 则返回 `0`。</float></float>
	max_load_factor	最大负载因子
	```c++ void rehash(size_type n); ```	```c++ void rehash(size_type n); ```
	Changes if necessary the size of the bucket array so that there are at least `n` buckets, and so that the load factor is less than or equal to the maximum load factor. When applicable, this will either grow or shrink the `bucket_count()` associated with the container.	必要时改变桶数组的大小，使得至少包含 `n` 个桶，并且负载因子小于或等于最大负载因子。在适用的情况下，这将增大或缩小与容器相关联的 `bucket_count()`。
	When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.	当 `size() == 0` 时，`rehash(0)` 将释放底层桶数组的内存。如果所提供的分配器使用 fancy pointers，随后将执行一次默认分配。
	```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```	```c++ template<class... args=""> std::pair<iterator, bool=""> emplace(Args&&... args); ```</iterator,></class...>
	`boost::unordered_flat_set` — An open-addressing unordered associative container that stores unique values.	`boost::unordered_flat_set` — 一种开放定址无序关联容器，用于存储唯一值。
	The performance of `boost::unordered_flat_set` is much better than that of `boost::unordered_set` or other implementations of `std::unordered_set`. Unlike standard unordered associative containers, which are node-based, the elements of a `boost::unordered_flat_set` 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_set` 的性能远优于 `boost::unordered_set` 或 `std::unordered_set` 的其他实现。与基于节点的标准无序关联容器不同，`boost::unordered_flat_set` 的元素直接保存在桶数组中，当插入位置已被占用时，会转移到原始位置附近可用的桶中。这种数据布局称为开放定址。
	As a result of its using open addressing, the interface of `boost::unordered_flat_set` deviates in a number of aspects from that of `boost::unordered_flat_set`/`std::unordered_flat_set`:	由于采用开放定址，`boost::unordered_flat_set` 的接口在多个方面与 `boost::unordered_set`/`std::unordered_set` 存在差异：
	- `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` 必须可移动构造。 - 在重哈希过程中不保持指针稳定性。 - `begin()` 不是常数时间操作。 - 没有用于桶操作的 API（除了 `bucket_count`），也没有节点提取/插入的 API。 - 容器的最大负载因子由内部管理，用户无法设置。
	_Key_	_键_
	`Key` must be https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] into the container	`Key` 必须可以 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^] 到容器中
	_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`.	一种一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数，并返回一个 `std::size_t` 类型的值。
	An allocator whose value type is the same as the container's value type.	一种分配器，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[fancy pointers] 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.	容器的元素保存在内部的桶数组中。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（发生冲突），则会使用原始位置附近的一个可用桶。
	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.	桶数组的大小可以通过调用 `insert`/`emplace` 自动增加，或者作为调用 `rehash`/`reserve` 的结果而增加。容器的负载因子（元素个数除以桶数量）永远不会大于 `max_load_factor()`，但在容量较小的情况下，实现可能会允许更高的负载。
	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.	如果`link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanching[hash_is_avalanching]<hash>::value` 为 `true`，则哈希函数将按原样使用；否则，将添加一个比特混合后处理阶段，以增加哈希质量，但会增加额外的计算成本。</hash>
	Configuration Macros	配置宏

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