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```c++ void swap(concurrent_flat_set& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```
```c++ void swap(concurrent_flat_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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---
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:1268
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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：;; 根据所使用执行策略的异常处理机制，若`f`内抛出异常，则可能调用`std::terminate`。
备注：;; 仅在支持C++17并行算法的编译器中可用。

该重载仅当`std::is_execution_policy_v<std::remove_cvref_t<EexecutionPpolicy>>` is `true`. + + Unsequenced &gt;`为`true`时才参与重载决议。

不允许使用无顺序执行策略。</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`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。
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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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---
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:1250
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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：;; 删除的元素数量。
抛出：;; 仅当 `f` 抛出异常时才会抛出异常。
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Successively invokes `f` with references to each of the elements in the table, and erases those for which `f` returns `true`.
Successively invokes `f` with references to each of the elements in the table, and erases those for which `f` returns 依次以表中每个元素的引用调用`f`，并删除`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
:1239
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---
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:1237
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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.
Returns:;; The number of elements erased (0 or 1). Throws:;; Only throws an exception if it is thrown by返回值：;; 删除的元素数量（0 或 1）。
抛出：;; 仅当 `hasher`, 、`key_equal` or或 `f`. Notes:;; The `template<class K, class F>` overload only participates in overload resolution if 抛出异常时才会抛出异常。
备注：;; 仅当 `std::is_execution_policy_v<std::remove_cvref_t<EexecutionPpolicy>>` is&gt;` 为 `false`. + + The 时，`template<class K,k,="" class F>` overload only participates in overload resolution if="" f="">` 重载才参与重载决议。

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,="" class="" f="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接受 `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.类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。</class></class></std::remove_cvref_t<executionpolicy>
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Erases the element `x` with key equivalent to `k` if it exists and `f(x)` is `true`.
Erases the element `x` with key equivalent to `k` if it exists and 若键与`k`等价的元素存在且`f(x)` is 为`true`.，则删除该元素`x`。
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```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 Ff=""> size_type erase_if(const key_type&amp; k, F f); template<class K,k,="" class F="" f=""> size_type erase_if(const K&amp; k, F f); ```</class></class>
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erase_if by Key
erase_if by Key通过键进行条件擦除
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---
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:1220
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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.
Returns:;; The number of elements erased (0 or 1). Throws:;; Only throws an exception if it is thrown by返回值：;; 删除的元素数量（0 或 1）。
抛出：;; 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。
备注：;; `template<class k="">` 重载仅当 `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才参与重载决议。标准库假定 `Hash` 可同时接受 `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.类型调用，且 `Pred` 是透明的。这实现了异构查找，避免了实例化 `Key` 类型对象的开销。</class>
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Erases the element with key equivalent to `k` if it exists.
Erases the element with key equivalent to `k` if it exists.若存在键与`k`等价的元素，则将其删除。
06/05/2026

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