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Key	English	Chinese (Simplified Han script)
	Returns:;; The number of elements erased. Throws:;; Only throws an exception if it is thrown by `f`.	返回值：;; 删除的元素数量。异常：;; 仅当 `f` 抛出异常时才会抛出异常。
:1347	---	---
	Parallel erase_if	并行条件擦除
	```c++ template<class ExecutionPolicy, class F> void erase_if(ExecutionPolicy&& policy, F f); ```	```c++ template<class executionpolicy,="" class="" f=""> void erase_if(ExecutionPolicy&& policy, F f); ```</class>
	Invokes `f` with references to each of the elements in the table, and erases those for which `f` returns `true`. Execution is parallelized according to the semantics of the execution policy specified.	以表中每个元素的引用调用 `f`，并删除所有 `f` 返回 `true` 的元素。执行过程将根据指定执行策略的语义进行并行化处理。
	Throws:;; Depending on the exception handling mechanism of the execution policy used, may call `std::terminate` if an exception is thrown within `f`. Notes:;; Only available in compilers supporting C++17 parallel algorithms. + + This overload only participates in overload resolution if `std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>>` is `true`. + + Unsequenced execution policies are not allowed.	异常：;; 依据所使用执行策略的异常处理机制，若 `f` 内部抛出异常，则可能调用 `std::terminate`。注意：;; 仅在支持 C++17 并行算法的编译器中可用。注意：;; 仅当 `std::is_execution_policy_v<std::remove_cvref_t<executionpolicy>>` 为 `true` 时，该重载才参与重载决议。注意：;; 不允许使用无序执行策略。</std::remove_cvref_t<executionpolicy>
:1365	---	---
	swap	交换
	```c++ void swap(concurrent_node_set& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value \|\| boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```	```c++ void swap(concurrent_node_set& other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value \|\| boost::allocator_traits<allocator>::propagate_on_container_swap::value); ```</allocator></allocator>
	Swaps the contents of the table with the parameter.	将当前表与参数对象的内容进行交换。
	If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the tables' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.	若 `Allocator::propagate_on_container_swap` 已声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换两个表的分配器。否则，使用不相等的分配器进行交换会导致未定义行为。
	Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping. Concurrency:;; Blocking on `*this` and `other`.	异常：;; 除非 `key_equal` 或 `hasher` 在交换时抛出异常，否则不抛出任何异常。并发：;; 阻塞 `*this` 和 `other`。
:1382	---	---
	extract	extract
	```c++ node_type extract(const key_type& k); template<class K> node_type extract(K&& k); ```	```c++ node_type extract(const key_type& k); template<class k=""> node_type extract(K&& k); ```</class>
	Extracts the element with key equivalent to `k`, if it exists.	返回值：;; 提取键与 `k` 等价的元素（若该元素存在）。
	Returns:;; A `node_type` object holding the extracted element, or empty if no element was extracted. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. 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.	返回值：;; 存储提取元素的 `node_type` 对象，若未提取任何元素则为空。异常：;; 仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出异常。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
:1397	---	---
	extract_if	条件提取
	```c++ template<class F> node_type extract_if(const key_type& k, F f); template<class K, class F> node_type extract_if(K&& k, F f); ```	```c++ template<class f=""> node_type extract_if(const key_type& k, F f); template<class k,="" class="" f=""> node_type extract_if(K&& k, F f); ```</class></class>
	Extracts the element `x` with key equivalent to `k`, if it exists and `f(x)` is `true`.	若键与 `k` 等价的元素 `x` 存在且 `f(x)` 为 `true`，则提取该元素。
	Returns:;; A `node_type` object holding the extracted element, or empty if no element was extracted. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal` or `f`. 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.	返回值：;; 存储被提取元素的 `node_type` 对象，若未提取任何元素则为空。异常：;; 仅当 `hasher`、`key_equal` 或 `f` 抛出异常时才会抛出异常。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
:1412	---	---
	clear	清空
	```c++ void clear() noexcept; ```	```c++ void clear() noexcept; ```
	Erases all elements in the table.	删除表中的所有元素。
	Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()` Concurrency:;; Blocking on `*this`.	后置条件：;; `size() == 0`，`max_load() >= max_load_factor() * bucket_count()` 并发：;; 阻塞 `*this`。
:1425	---	---
	merge	合并
	```c++ template<class H2, class P2> size_type merge(concurrent_node_set<Key, H2, P2, Allocator>& source); template<class H2, class P2> size_type merge(concurrent_node_set<Key, H2, P2, Allocator>&& source); ```	```c++ template<class h2,="" class="" p2=""> size_type merge(concurrent_node_set<key, h2,="" p2,="" allocator="">& source); template<class h2,="" class="" p2=""> size_type merge(concurrent_node_set<key, h2,="" p2,="" allocator="">&& source); ```</key,></class></key,></class>
	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` 内的元素移动插入，并从 `source` 中删除这些元素。

	English	Chinese (Simplified Han script)	Actions
	Erases the element with key equivalent to `k` if it exists.	删除键与 `k` 等价的元素（若该元素存在）。
	Returns:;; The number of elements erased (0 or 1). Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. 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.	返回值：;; 删除的元素数量（0 或 1）。异常：;; 仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出异常。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
	```c++ template<class F> size_type erase_if(const key_type& k, F f); template<class K, class F> size_type erase_if(const K& k, F f); ```	```c++ template<class f=""> size_type erase_if(const key_type& k, F f); template<class k,="" class="" f=""> size_type erase_if(const K& k, F f); ```</class></class>
	Erases the element `x` with key equivalent to `k` if it exists and `f(x)` is `true`.	若键与 `k` 等价的元素 `x` 存在且 `f(x)` 为 `true`，则删除该元素。
	Returns:;; The number of elements erased (0 or 1). Throws:;; Only throws an exception if it is thrown by `hasher`, `key_equal` or `f`. Notes:;; The `template<class K, class F>` overload only participates in overload resolution if `std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>>` is `false`. + + The `template<class K, class F>` 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.	返回值：;; 删除的元素数量（0 或 1）。异常：;; 仅当 `hasher`、`key_equal` 或 `f` 抛出异常时才会抛出异常。注意：;; 仅当 `std::is_execution_policy_v<std::remove_cvref_t<executionpolicy>>` 为 `false` 时，`template<class k,="" class="" f="">` 重载才参与重载决议。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k,="" class="" f="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class></class></std::remove_cvref_t<executionpolicy>
	```c++ template<class F> size_type erase_if(F f); ```	```c++ template<class f=""> size_type erase_if(F f); ```</class>
	Successively invokes `f` with references to each of the elements in the table, and erases those for which `f` returns `true`.	依次以表中每个元素的引用调用 `f`，并删除所有 `f` 返回 `true` 的元素。
	```c++ template<class ExecutionPolicy, class F> void erase_if(ExecutionPolicy&& policy, F f); ```	```c++ template<class executionpolicy,="" class="" f=""> void erase_if(ExecutionPolicy&& policy, F f); ```</class>
	Throws:;; Depending on the exception handling mechanism of the execution policy used, may call `std::terminate` if an exception is thrown within `f`. Notes:;; Only available in compilers supporting C++17 parallel algorithms. + + This overload only participates in overload resolution if `std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>>` is `true`. + + Unsequenced execution policies are not allowed.	异常：;; 依据所使用执行策略的异常处理机制，若 `f` 内部抛出异常，则可能调用 `std::terminate`。注意：;; 仅在支持 C++17 并行算法的编译器中可用。注意：;; 仅当 `std::is_execution_policy_v<std::remove_cvref_t<executionpolicy>>` 为 `true` 时，该重载才参与重载决议。注意：;; 不允许使用无序执行策略。</std::remove_cvref_t<executionpolicy>
	swap	交换
	```c++ void swap(concurrent_node_set& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value \|\| boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```	```c++ void swap(concurrent_node_set& other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value \|\| boost::allocator_traits<allocator>::propagate_on_container_swap::value); ```</allocator></allocator>
	Swaps the contents of the table with the parameter.	将当前表与参数对象的内容进行交换。
	If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the tables' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.	若 `Allocator::propagate_on_container_swap` 已声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换两个表的分配器。否则，使用不相等的分配器进行交换会导致未定义行为。
	extract	extract
	```c++ node_type extract(const key_type& k); template<class K> node_type extract(K&& k); ```	```c++ node_type extract(const key_type& k); template<class k=""> node_type extract(K&& k); ```</class>
	Extracts the element with key equivalent to `k`, if it exists.	返回值：;; 提取键与 `k` 等价的元素（若该元素存在）。
	Returns:;; A `node_type` object holding the extracted element, or empty if no element was extracted. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. 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.	返回值：;; 存储提取元素的 `node_type` 对象，若未提取任何元素则为空。异常：;; 仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出异常。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
	extract_if	条件提取
	```c++ size_type max_load() const noexcept; ```	```c++ size_type max_load() const noexcept; ```
	Returns:;; A `node_type` object holding the extracted element, or empty if no element was extracted. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal` or `f`. 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.	返回值：;; 存储被提取元素的 `node_type` 对象，若未提取任何元素则为空。异常：;; 仅当 `hasher`、`key_equal` 或 `f` 抛出异常时才会抛出异常。注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` 与 `Key` 类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
	clear	清空
	```c++ void clear() noexcept; ```	```c++ void clear() noexcept; ```
	Erases all elements in the table.	删除表中的所有元素。
	Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()` Concurrency:;; Blocking on `*this`.	后置条件：;; `size() == 0`，`max_load() >= max_load_factor() * bucket_count()` 并发：;; 阻塞 `*this`。
	merge	合并
	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` 内的元素移动插入，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`。
	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`.	抛出异常：;; 若抛出异常，函数无任何效果（由表的哈希函数或比较函数抛出的异常除外）。并发：;; 阻塞 `*this`。
	get_stats	get_stats
	```c++ stats get_stats() const; ```	```c++ stats get_stats() const; ```

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:1390

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