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Otherwise inserts the element owned by `nh`.
Otherwise inserts the element owned by `nh`.否则，插入 `nh` 所拥有的元素。
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If `nh` is empty, has no effect.
If如果 `nh` is empty, has no effect.为空，则无效果。
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```c++ iterator insert(node_type&& nh); ```
```c++ iterator insert(node_type&&& nh); ```
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Insert with `node_handle`
Insert with通过 `node_handle` 插入
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Returns:;; A `node_type` owning the element if found, otherwise an empty `node_type`. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. Notes:;; A node extracted using this method can be inserted into a compatible `unordered_map`. + + The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs and neither `iterator` nor `const_iterator` are implicitly convertible from `K`. 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` owning the element if found, otherwise an empty `node_type`. Throws:;; Only throws an exception if it is thrown by返回：如果找到该元素，则返回一个拥有该元素的 `node_type`；否则返回一个空的 `node_type`。
抛出：仅当 `hasher` or或 `key_equal`. Notes:;; A node extracted using this method can be inserted into a compatible 抛出异常时才会抛出。
注意：通过此方法提取的节点可以插入到兼容的 `unordered_map`. + + The 中。

`template<class K>` overload only participates in overload resolution ifk="">` 重载仅在 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs and neither是有效的成员 typedef，且 `iterator` nor和 `const_iterator` are implicitly convertible from `K`. The library assumes that `Hash` is callable with both都不能从 `K` 隐式转换时参与重载决议。库假定 `Hash` 可同时使用 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</class>
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Removes an element with key equivalent to `k`.
Removes an element with key equivalent to `k`.移除一个键与 `k` 等价的元素。
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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 by Key
Extract by Key通过键提取
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Returns:;; A `node_type` owning the element. Notes:;; A node extracted using this method can be inserted into a compatible `unordered_map`.
Returns:;; A `node_type` owning the element. Notes:;; A node extracted using this method can be inserted into a compatible返回：一个拥有该元素的 `node_type`。
注意：通过此方法提取的节点可以插入到兼容的 `unordered_map`. 中。
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Removes the element pointed to by `position`.
Removes the element pointed to by移除 `position`. 所指向的元素。
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```c++ node_type extract(const_iterator position); ```
```c++ node_type extract(const_iterator position); ```
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Extract by Iterator
Extract by Iterator通过迭代器提取
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container. Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is可以在容器中进行 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container. Throws:;; When inserting a single element, if an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.可拷贝插入^]。
抛出：当插入单个元素时，如果除调用 `hasher` 之外的操作抛出异常，则该函数无效果。
注意：可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
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Inserts a range of elements into the container.
Inserts a range of elements into the container.将一个范围内的元素插入容器中。
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```c++ void insert(std::initializer_list<value_type> il); ```
```c++ void insert(std::initializer_list<value_type> il); ```</value_type>
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Insert Initializer List
Insert Initializer List初始化列表插入
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