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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。
06/05/2026
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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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---
---
:1347
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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。
异常：;; 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
:1336
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---
---
:1334
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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）。
异常：;; 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。
注意：;; 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。
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,="" class="" f="">` 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></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 `x` 存在且 `f(x)` is为 `true`.，则删除该元素。
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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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---
---
:1317
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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）。
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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Erases the element with key equivalent to `k` if it exists.
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）。
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```c++ size_type erase(const key_type& k); template<class K> size_type erase(const K& k); ```
```c++ size_type erase(const key_type&amp; k); template<class Kk=""> size_type erase(const K&amp; k); ```</class>
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erase
erase擦除
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---
---
:1302
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Throws:;; If an exception is thrown by an operation other than a call to `hasher` or call to `f1` or `f2`, the function has no effect. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.
Throws:;; If an exception is thrown by an operation other than a call to `hasher` or call to `f1` or `f2`, the function has no effect. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.若 `nh` 为空，则不执行任何操作；否则，当且仅当容器中不存在与 `nh.value()` 等效的键时，插入其关联的元素，并使用指向新插入元素的常量引用调用 `f1` ；否则，使用指向等效元素的常量引用调用 `f2` 。
06/05/2026

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