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```c++ template<class Key, class Hash, class Pred, class Alloc> bool operator==(const unordered_set<Key, Hash, Pred, Alloc>& x, const unordered_set<Key, Hash, Pred, Alloc>& y); ```
```c++ template<class Kkey,="" class Hash, class Pred, class A="" hash,="" pred,="" alloc=""> bool operator==(const unordered_set<Kkey, Hhash, Pred, Alloc>&="" pred,="" alloc="">&amp; x, const unordered_set<Kkey, Hhash, Pred, Alloc>& y); ```="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
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operator
operator
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Equality Comparisons
Equality Comparisons相等性比较
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__iter-value-type__
__iter-value-type__
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A `size_­type` parameter type in a deduction guide refers to the `size_­type` member type of the container type deduced by the deduction guide. Its default value coincides with the default value of the constructor selected.
A推导指引中的 `size_­++_++type` parameter type in a deduction guide refers to the参数类型，指向由该推导指引所推导容器类型的 `size_­++_++type` member type of the container type deduced by the deduction guide. Its default value coincides with the default value of the constructor selected.成员类型。其默认值与所选构造函数的默认值一致。
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- It has an `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.
- It has an该推导指引包含 `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.模板参数，且为此参数推导出的类型不符合输入迭代器的要求。 - 该推导指引包含 `Allocator` 模板参数，且为该参数推导出的类型不符合分配器要求。 - 该推导指引包含 `Hash` 模板参数，且为该参数推导出的类型为整型或符合分配器要求。 - 该推导指引包含 `Pred` 模板参数，且为该参数推导出的类型符合分配器要求。
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A deduction guide will not participate in overload resolution if any of the following are true:
A deduction guide will not participate in overload resolution if any of the following are true:如果以下任何一条件为真，则推导指引将不参与重载决议：
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Deduction Guides
Deduction Guides推导指引
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.抛出：若抛出异常（除非由容器的哈希函数或比较函数抛出），则该函数无效果。
:1403
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
:1400
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Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.
Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.与 `rehash` 类似，该函数可用于增加或减少容器中的桶数量。
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Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`, or `a.rehash(1)` if `n > 0` and `a.max_load_factor() == std::numeric_limits<float>::infinity()`.
Equivalent to等价于 `a.rehash(ceil(n / a.max_load_factor()))`, or `a.rehash(1)` if `n >，若 `n &gt; 0` and且 `a.max_load_factor() == std::numeric_limits<float>::infinity()`. 则等价于 `a.rehash(1)`。</float>
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```c++ void reserve(size_type n); ```
```c++ void reserve(size_type n); ```
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reserve
reserve保留
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---
---
:1389
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.抛出：若抛出异常（除非由容器的哈希函数或比较函数抛出），则该函数无效果。
:1387
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
:1384
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When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array.
When当 `size() == 0`, 时，`rehash(0)` will deallocate the underlying buckets array.将释放底层桶数组。
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Changes the number of buckets so that there are at least `n` buckets, and so that the load factor is less than or equal to the maximum load factor. When applicable, this will either grow or shrink the `bucket_count()` associated with the container.
Changes the number of buckets so that there are at least `n` buckets, and so that the load factor is less than or equal to the maximum load factor. When applicable, this will either grow or shrink the `bucket_count()` associated with the container.改变桶的数量，使其至少为 `n` 个，并确保负载因子小于或等于最大负载因子。此操作将根据情况增加或减少容器关联的 `bucket_count()` 。
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```c++ void rehash(size_type n); ```
```c++ void rehash(size_type n); ```
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