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Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the table.
Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the table.与 `rehash` 功能类似，该函数可用于**增加或减少**哈希表中的桶数量。
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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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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the table's hash function or comparison function. Concurrency:;; Blocking on `*this`. ---
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the table's hash function or comparison function. Concurrency:;; Blocking on 抛出：;; 若抛出异常，函数无任何效果（哈希函数或比较函数抛出的异常除外）。
并发：;; 阻塞`*this`. 。
---
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Invalidates pointers and references to elements, and changes the order of elements.
Invalidates pointers and references to elements, and changes the order of elements.会使指向元素的指针和引用失效，并改变元素的存储顺序。
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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.会释放底层的哈希桶数组内存。
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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 table.
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 table.效果：;; 必要时调整哈希桶数组的大小，使桶数量至少为 `n`，且负载因子小于等于最大负载因子。
适用情况下，该操作会**增大或缩小**哈希表的桶数量（`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 table can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the table's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
Returns:;; The maximum number of elements the table can hold without rehashing, assuming that no further elements will be erased. Note:;; After construction, rehash or clearance, the table's maximum load is at least `max_load_factor() * bucket_count()`. This number may decrease on erasure under high-load conditions. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.返回值：;; 哈希表在不进行重哈希的前提下可容纳的最大元素数量（假设不会再删除任何元素）。
备注：;; 构造完成、重哈希或清空后，哈希表的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下执行删除操作后，该数值可能会降低。
在存在并发插入操作时，返回的值可能无法准确反映执行后哈希表的真实状态。
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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（最大负载）
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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_set`.
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，因为不允许用户修改此参数。保留该函数是为了与 `boost::unordered_set`. 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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---
---
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Returns:;; Returns the table's maximum load factor.
Returns:;; Returns the table's maximum load factor.返回值：;; 返回哈希表的最大负载因子。
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