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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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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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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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If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
If如果 `Allocator::propagate_on_container_swap` is declared and被声明且 `Allocator::propagate_on_container_swap::value` is为 `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.，则交换容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
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Swaps the contents of the container with the parameter.
Swaps the contents of the container with the parameter.交换容器的内容与参数的内容。
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```c++ void swap(unordered_node_map& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value || boost::allocator_traits<Allocator>::propagate_on_container_swap::value); ```
```c++ void swap(unordered_node_map&amp; other) noexcept(boost::allocator_traits<Aallocator>::is_always_equal::value || boost::allocator_traits<Aallocator>::propagate_on_container_swap::value); ```</allocator></allocator>
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swap
swap交换
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Returns:;; The iterator following the erased elements - i.e. `last`. Throws:;; Nothing in this implementation (neither the `hasher` nor the `key_equal` objects are called).
Returns:;; The iterator following the erased elements - i.e. `last`. Throws:;; Nothing in this implementation (neither the返回：被擦除元素之后的迭代器——即 `last`。
抛出：在此实现中不抛出任何异常（既不调用 `hasher` nor the也不调用 `key_equal` objects are called).对象）。
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Erases the elements in the range from `first` to `last`.
Erases the elements in the range from `first` to `last`.
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```c++ iterator erase(const_iterator first, const_iterator last); ```
```c++ iterator erase(const_iterator first, const_iterator last); ```
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Erase Range
Erase Range范围擦除
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