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Postconditions:;; `size() == 0` Throws:;; Never throws an exception.
Postconditions:;; `size() == 0` Throws:;; Never throws an exception.后置条件：`size() == 0` 抛出：永不抛出异常。
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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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---
---
:1101
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Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of抛出：除非 `key_equal` or或 `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors. 的复制构造函数或复制赋值运算符抛出异常，否则不会抛出异常。说明：由于相等谓词和哈希函数是通过它们的复制构造函数进行交换的，因此异常规范与 C++11 标准并不完全相同。
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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如果声明了 `Allocator::propagate_on_++_++on++_++container_++_++swap` is declared and且 `Allocator::propagate_on_++_++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。则，在分配器不相等的情况下进行交换将导致未定义行为。
:1095
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Swaps the contents of the container with the parameter.
Swaps the contents of the container with the parameter.交换容器与参数的内容。
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```c++ void swap(unordered_set& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value && boost::is_nothrow_swappable_v<Hash> && boost::is_nothrow_swappable_v<Pred>); ```
```c++ void swap(unordered_set&amp; other) noexcept(boost::allocator_traits<Aallocator>::is_always_equal::value &&amp;&amp; boost::is_nothrow_swappable_v<Hhash> &&amp;&amp; boost::is_nothrow_swappable_v<Ppred>); ```</pred></hash></allocator>
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swap
swap交换
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---
---
:1083
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Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated.
Throws:;; Only throws an exception if it is thrown by抛出：仅当 `hasher` or或 `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated. 抛出异常时才会抛出异常。
+ + 在此实现中，此重载不会调用这两个函数对象的任何方法，因此不会抛出异常，但在其他实现中可能并非如此。
说明：此方法最初实现的原因是，从 `erase` 返回指向下一个元素的迭代器开销较大，但容器已经过重新设计，该问题已不复存在。因此，此方法现已弃用。
:1078
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Erase the element pointed to by `position`.
Erase the element pointed to by擦除由 `position`. 指向的元素。
:1075
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```c++ void erase_return_void(const_iterator position); ```
```c++ void erase_return_void(const_iterator position); ```
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erase_return_void
erase_return_void
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---
---
:1068
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Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated.
Throws:;; Only throws an exception if it is thrown by抛出：仅当 `hasher` or或 `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated. 抛出异常时才会抛出异常。
+ + 在此实现中，此重载不会调用这两个函数对象的任何方法，因此不会抛出异常，但在其他实现中可能并非如此。
说明：此方法最初实现的原因是，从 `erase` 返回指向下一个元素的迭代器开销较大，但容器已经过重新设计，该问题已不复存在。因此，此方法现已弃用。
:1063
06/05/2026
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Erase the element pointed to by `position`.
Erase the element pointed to by擦除由 `position`. 指向的元素。
:1060
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```c++ void quick_erase(const_iterator position); ```
```c++ void quick_erase(const_iterator position); ```
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quick_erase
quick_erase
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