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Postconditions:;; `size() == 0`, `max_load() >= max_load_factor() * bucket_count()`
Postconditions:;; 后置条件：`size() == 0`, ，`max_load() >>= max_load_factor() * bucket_count()`
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Erases all elements in the container.
Erases all elements in the container.擦除容器中的所有元素。
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```c++ void clear() noexcept; ```
```c++ void clear() noexcept; ```
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clear
clear清空
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---
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:1046
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Move-constructs an `init_value` `x` from the element pointed to by `position`, erases the element and returns `x`.
Move-constructs an `init_value` `x` from the element pointed to by `position`, erases the element and returns从 `position` 指向的元素移动构造一个 `init_value` 对象 `x`，擦除该元素并返回 `x`.。
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```c++ init_type pull(const_iterator position); ```
```c++ init_type pull(const_iterator position); ```
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pull
pull
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---
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:1036
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Returns:;; A `node_type` object holding the extracted element, or empty if no element was extracted. 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:;; A `node_type` object holding the extracted element, or empty if no element was extracted. Throws:;; Only throws an exception if it is thrown by返回：一个持有被提取元素的 `node_type` 对象；如果未提取到任何元素，则返回空。
抛出：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。
注意：`template<class k="">` 重载仅在 `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 时才参与重载决议。库假定 `Hash` 可同时用 `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，并且 `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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Extracts the element with key equivalent to `k`, if it exists.
Extracts the element with key equivalent to `k`, if it exists.提取键与 `k` 等价的元素（如果存在）。
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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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---
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:1021
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Returns:;; A `node_type` object holding the extracted element. Throws:;; Nothing.
Returns:;; A `node_type` object holding the extracted element. Throws:;; Nothing.返回：一个持有被提取元素的 `node_type` 对象。
抛出：不抛出任何异常。
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Extracts the element pointed to by `position`.
Extracts the element pointed to by提取 `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 Position
Extract by Position通过位置提取
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---
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:1008
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Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping.
Throws:;; Nothing unless抛出：除非 `key_equal` or或 `hasher` throw on swapping.在交换时抛出异常，否则不抛出任何异常。
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