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Extracts the element `x` with key equivalent to `k`, if it exists and `f(x)` is `true`.
Extracts the element `x` with key equivalent to `k`, if it exists and若键与 `k` 等价的元素 `x` 存在且 `f(x)` is为 `true`.，则提取该元素。
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```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 Ff=""> node_type extract_if(const key_type&amp; k, F f); template<class K,k,="" class F="" f=""> node_type extract_if(K&&amp;&amp; k, F f); ```</class></class>
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extract_if
extract_if条件提取
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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.
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` or或 `key_equal`. Notes:;; The `template<class K>` overload only participates in overload resolution if 抛出异常时才会抛出异常。
注意：;; 仅当 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both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` and与 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.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>
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Extracts the element with key equivalent to `k`, if it exists.
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）。
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```c++ node_type extract(const key_type& k); template<class K> node_type extract(K&& k); ```
```c++ node_type extract(const key_type&amp; k); template<class Kk=""> node_type extract(K&& k); ```amp;&amp; k); ```</class>
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extract
extract
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Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping. Concurrency:;; Blocking on `*this` and `other`.
Throws:;; Nothing unless异常：;; 除非 `key_equal` or或 `hasher` throw on swapping. Concurrency:;; Blocking on在交换时抛出异常，否则不抛出任何异常。
并发：;; 阻塞 `*this` and和 `other`.。
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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.
If若 `Allocator::propagate_on_container_swap` is declared and已声明且 `Allocator::propagate_on_container_swap::value` is为 `true` then the tables' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.，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。
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Swaps the contents of the table with the parameter.
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。
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```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&amp; other) noexcept(boost::allocator_traits<Aallocator>::is_always_equal::value || boost::allocator_traits<Aallocator>::propagate_on_container_swap::value); ```</allocator></allocator>
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swap
swap交换
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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.
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<EexecutionPpolicy>>` is `true`. + + Unsequenced &gt;` 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<execution policies are not allowed.y>
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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.
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。
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```c++ template<class ExecutionPolicy, class F> void erase_if(ExecutionPolicy&& policy, F f); ```
```c++ template<class EexecutionPpolicy,="" class F="" f=""> void erase_if(ExecutionPolicy&&amp;&amp; policy, F f); ```</class>
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Parallel erase_if
Parallel erase_if并行条件擦除
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