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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.若存在键与 `k` 等价的元素，则提取该元素。
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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抛出异常：;; 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。
并发特性：;; 阻塞当前容器 `*this` and与目标容器 `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若声明了 `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.且其值为 `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。
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Swaps the contents of the table with the parameter.
Swaps the contents of the table with the parameter.将当前表与参数表的内容进行交换。
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```c++ void swap(concurrent_node_map& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```
```c++ void swap(concurrent_node_map&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 抛出异常：;; 依据所使用执行策略的异常处理机制，若 `f` 内部抛出异常，可能会调用 `std::terminate`。注意：;; 仅在支持 C++17 并行算法的编译器中可用。该重载版本仅在`std::is_execution_policy_v<std::remove_cvref_t<EexecutionPpolicy>>` is `true`. + + Unsequenced &gt;` 为 `true` 时参与重载决议。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 non-const 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 non-const 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.根据指定执行策略的语义并行执行操作：依次以**非常量引用**为参数对表中的每个元素调用 `f`，并删除所有 `f` 返回 `true` 的元素。
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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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Returns:;; The number of elements erased. Throws:;; Only throws an exception if it is thrown by `f`.
Returns:;; The number of elements erased. Throws:;; Only throws an exception if it is thrown by `f`.返回值：;; 删除的元素总数。
抛出异常：;; 仅当 `f` 抛出异常时才会抛出。
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Successively invokes `f` with non-const references to each of the elements in the table, and erases those for which `f` returns `true`.
Successively invokes `f` with non-const references to each of the elements in the table, and erases those for which `f` returns依次以非常量引用为参数，对表中的每个元素调用 `f`，并删除所有 `f` 返回 `true`. 的元素。
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```c++ template<class F> size_type erase_if(F f); ```
```c++ template<class Ff=""> size_type erase_if(F f); ```</class>
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erase_if
erase_if
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:1528
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