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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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---
---
:1134
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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. + + The `template<class K, class M>` 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:;; 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. + + The 返回：如果发生了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。
抛出：如果除调用 `hasher` 之外的操作抛出异常，则该函数无效果。
注意：标准关于 `hint` 的含义表述相当模糊。但唯一实际的使用方式，也是 Boost.Unordered 支持的唯一方式，是将其指向一个具有相同键的已存在元素。
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。
`template<class K,k,="" class M>` only participates in overload resolution if="" m="">` 仅在 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both是有效的成员 typedef 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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`hint` is a suggestion to where the element should be inserted.
`hint` is a suggestion to where the element should be inserted.是关于元素插入位置的建议。
:1121
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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), std::forward_as_tuple(std::forward<M>(obj))) ```
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kk>(k)), std::forward_as_tuple(std::forward<Mm>(obj))) ```</m></k>
:1116
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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Key>(k)), std::forward_as_tuple(std::forward<M>(obj)))
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kkey>(k)), std::forward_as_tuple(std::forward<Mm>(obj)))</m></key>
:1111
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If there is no such element, it is added to the container as: ```c++
If there is no such element, it is added to the container as: ```c++向容器中插入新元素，或通过赋值给已存在的元素值来更新该元素。
:1108
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If there is an element with key `k`, then it is updated by assigning `std::forward<M>(obj)`.
If there is an element with key `k`, then it is updated by assigning如果存在键为 `k` 的元素，则通过赋值 `std::forward<Mm>(obj)`. 来更新它。</m>
:1106
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Inserts a new element into the container or updates an existing one by assigning to the contained value.
Inserts a new element into the container or updates an existing one by assigning to the contained value.向容器中插入一个新元素，或通过赋值更新现有元素的值。
:1104
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```c++ template<class M> iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj); template<class M> iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj); template<class K, class M> iterator insert_or_assign(const_iterator hint, K&& k, M&& obj); ```
```c++ template<class Mm=""> iterator insert_or_assign(const_iterator hint, const key_type&amp; k, M&&amp;&amp; obj); template<class Mm=""> iterator insert_or_assign(const_iterator hint, key_type&& k, M&&amp;&amp; k, M&amp;&amp; obj); template<class K,k,="" class M="" m=""> iterator insert_or_assign(const_iterator hint, K&& k, M&& obj); ```amp;&amp; k, M&amp;&amp; obj); ```</class></class></class>
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insert_or_assign with Hint
带提示位置的 `insert_or_assign with Hint`
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---
---
:1092
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Returns:;; The bool component of the return type is true if an insert took place. + + 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:;; 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. + + The `template<class K, class M>` 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 bool component of the return type is true if an insert took place. + + 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:;; 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. + + The 返回：返回类型的 bool 分量为 true 表示发生了插入。
如果发生了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。
抛出：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。

`template<class K,k,="" class M>` only participates in overload resolution if="" m="">` 仅在 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both是有效的成员 typedef 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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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), std::forward_as_tuple(std::forward<M>(obj))) ```
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kk>(k)), std::forward_as_tuple(std::forward<Mm>(obj))) ```</m></k>
:1076
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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Key>(k)), std::forward_as_tuple(std::forward<M>(obj)))
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kkey>(k)), std::forward_as_tuple(std::forward<Mm>(obj)))</m></key>
:1071
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If there is no such element, it is added to the container as: ```c++
If there is no such element, it is added to the container as: 如果不存在这样的元素，则将其添加到容器中，形式为：
```c++
:1068
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If there is an element with key `k`, then it is updated by assigning `std::forward<M>(obj)`.
If there is an element with key `k`, then it is updated by assigning如果存在键为 `k` 的元素，则通过赋值 `std::forward<Mm>(obj)`. 来更新它。</m>
:1066
06/05/2026
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Inserts a new element into the container or updates an existing one by assigning to the contained value.
Inserts a new element into the container or updates an existing one by assigning to the contained value.向容器中插入一个新元素，或通过赋值更新现有元素的值。
:1064
06/05/2026

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