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Invalidates iterators and changes the order of elements.
Invalidates iterators and changes the order of elements.使迭代器失效并改变元素的顺序。
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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，此函数可用于增大或缩小容器中的桶数量。
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Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`.
Equivalent to等价于 `a.rehash(ceil(n / a.max_load_factor()))`.。
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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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---
---
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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：如果抛出异常（除非是由容器的哈希函数或比较函数抛出的），则该函数无效果。
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Invalidates iterators and changes the order of elements.
Invalidates iterators and changes the order of elements.使迭代器失效并改变元素的顺序。
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When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.
When当 `size() == 0`, 时，`rehash(0)` will deallocate the underlying buckets array. If the provided Allocator uses fancy pointers, a default allocation is subsequently performed.将释放底层的桶数组。如果提供的分配器使用异形指针，则会随后执行一次默认分配。
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Changes if necessary the size of the bucket array 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 if necessary the size of the bucket array 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.必要时更改桶数组的大小，使其至少包含 `n` 个桶，并且使得负载因子小于或等于最大负载因子。在适用的情况下，这将增大或缩小与容器关联的 `bucket_count()`。
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```c++ void rehash(size_type n); ```
```c++ void rehash(size_type n); ```
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rehash
rehash重哈希
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---
---
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Returns:;; The maximum number of elements the container can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the container's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions.
Returns:;; The maximum number of elements the container can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the container's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions.返回：容器在不触发重哈希的情况下能够容纳的最大元素数量（假设不再有元素被擦除）。
注意：在构造、重哈希或清空操作之后，容器的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下，该数值可能会因元素擦除而减小。
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```c++ size_type max_load() const noexcept; ```
```c++ size_type max_load() const noexcept; ```
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max_load
max_load
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---
---
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Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_map`.
Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with效果：不执行任何操作，因为用户不允许更改此参数。保留此函数是为了与 `boost::unordered_map`. 保持兼容。
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```c++ void max_load_factor(float z); ```
```c++ void max_load_factor(float z); ```
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Set max_load_factor
Set max_load_factor设置最大负载因子
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