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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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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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---
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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` 。
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If the insertion failed, `inserted` is false and `node` has the previous value of `nh`.
If the insertion failed,若插入操作失败，则 `inserted` is为 false and，且 `node` has the previous value of `nh`.保留 `nh` 的原值。
:1297
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Otherwise if the insertion took place, `inserted` is true and `node` is empty.
Otherwise if the insertion took place,若插入操作成功，则 `inserted` is为 true and， 且 `node` is empty.为空。
:1296
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If `nh` is empty, `inserted` is `false` and `node` is empty.
If若 `nh` is empty,为空，则 `inserted` is为 `false` and且 `node` is empty.为空。
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Returns:;; An `insert_return_type` object constructed from `inserted` and `node`: +
Returns:;; An返回值：;; 由 `insert_return_type` object constructed from `inserted` and `node`: ed` 和 `node` 构造的 `insert_return_type` 对象：+
:1294
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If `nh` is empty, does nothing. Otherwise, inserts the associated element in the table if and only if there is no element in the table with a key equivalent to `nh.value()`, and then invokes `f1` with a const reference to the newly inserted element. Otherwise, invokes `f2` with a const reference to the equivalent element.
If若 `nh` is empty, does nothing. Otherwise, inserts the associated element in the table if and only if there is no element in the table with a key equivalent to `nh.value()`, and then invokes `f1` with a const reference to the newly inserted element. Otherwise, invokes `f2` with a const reference to the equivalent element.为空，则不执行任何操作。否则，当且仅当表中不存在与 `nh.value()` 键等价的元素时，将关联元素插入表中，随后以新插入元素的常量引用调用 `f1`；否则，以等价元素的常量引用调用 `f2`。
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```c++ template<class F1, class F2> insert_return_type insert_and_visit(node_type&& nh, F1 f1, F2 f2); template<class F1, class F2> insert_return_type insert_and_cvisit(node_type&& nh, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> insert_return_type insert_and_visit(node_type&&amp;&amp; nh, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> insert_return_type insert_and_cvisit(node_type&&amp;&amp; nh, F1 f1, F2 f2); ```</class></class>
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Insert Node and Visit
Insert Node and Visit节点插入并访问
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---
---
:1278
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Returns:;; The number of elements inserted.
Returns:;; The number of elements inserted.返回值：;; 已插入的元素数量。
:1276
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Equivalent to [listing,subs="+macros,+quotes"]
Equivalent to等价于 [listing,subs="+macros,+quotes"]
:1269
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```c++ template<class F1, class F2> size_type insert_and_visit(std::initializer_list<value_type> il, F1 f1, F2 f2); template<class F1, class F2> size_type insert_and_cvisit(std::initializer_list<value_type> il, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> size_type insert_and_visit(std::initializer_list<value_type> il, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> size_type insert_and_cvisit(std::initializer_list<value_type> il, F1 f1, F2 f2); ```</value_type></class></value_type></class>
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Insert Initializer List and Visit
Insert Initializer List and Visit初始化列表插入并访问
06/05/2026

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