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Removes an element with key equivalent to `k`.
Removes an element with key equivalent to `k`.移除键等价于 `k` 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 Value
Extract by Value通过键值提取元素
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Returns:;; A `node_type` owning the element. Notes:;; In C++17 a node extracted using this method can be inserted into a compatible `unordered_multiset`, but that is not supported yet.
Returns:;; A `node_type` owning the element. Notes:;; In C++17 a node extracted using this method can be inserted into a compatible `unordered_multiset`, but that is not supported yet.返回：一个拥有该元素的 `node_type`。说明：在 C++17 中，通过此方法提取的节点可以插入到兼容的 `unordered_multiset` 中，但该功能尚未支持。
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Removes the element pointed to by `position`.
Removes the element pointed to by移除由 `position`. 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需满足对容器而言的 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.可复制插入^] 要求。抛出：当插入单个元素时，若调用 `hasher` 以外的操作抛出异常，则函数无效果。说明：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. Elements are inserted if and only if there is no element in the container with an equivalent key.
Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.将元素范围插入容器中。仅当容器中不存在等价键的元素时，才会插入相应元素。
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```c++ void insert(std::initializer_list<value_type>); ```
```c++ void insert(std::initializer_list<value_type>); ```</value_type>
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Insert Initializer List
Insert Initializer List初始化列表插入
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `*first`. 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需从 `*first` 处满足对 `X` 的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `*first`. 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.可原位构造^] 要求。抛出：当插入单个元素时，若调用 `hasher` 以外的操作抛出异常，则函数无效果。说明：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. Elements are inserted if and only if there is no element in the container with an equivalent key.
Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.将元素范围插入容器中。仅当容器中不存在等价键的元素时，才会插入相应元素。
:895
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```c++ template<class InputIterator> void insert(InputIterator first, InputIterator last); ```
```c++ template<class IinputIiterator=""> void insert(InputIterator first, InputIterator last); ```</class>
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Insert Iterator Range
Insert Iterator Range迭代器范围插入
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `k`. Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + 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. + + This 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.
Requires:;; 要求：`value_type` is需从 `k` 处满足对容器的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `k`. Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + 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. + + This overload only participates in overload resolution if 可原位构造^] 要求。返回：若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。说明：标准对 hint 的含义表述相当模糊。但使用它的唯一实际方式，也是 Boost.Unordered 唯一支持的方式，是将其指向具有相同键的现有元素。+ +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。+ +此重载仅在以下条件下参与重载决议：`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均不能从 `K` 隐式转换。库假定 `Hash` 可同时以 `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。这实现了异构查找，从而避免了实例化 `Key` 类型对象的开销。
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