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When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array.
When效果：;; 当 `size() == 0`, 时，调用 `rehash(0)` will deallocate the underlying buckets array.会释放底层桶数组的内存。
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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：;; 必要时调整桶数组大小，确保桶数量至少为 `n`，且负载因子小于等于最大负载因子。适用时，会增大或缩小表关联的桶数量 `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：;; 表在不进行重哈希的情况下可容纳的最大元素数量（假定不会再删除任何元素）。
注意：;; 构造、重哈希或清空后，表的最大负载量至少为 `max_load_factor() * bucket_count()`。在高负载条件下执行删除操作时，该数值可能会降低。
注意：;; 若存在并发插入操作，返回值可能无法精确反映执行后表的真实状态。
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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++_++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：;; 表的最大负载因子。
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```c++ float max_load_factor() const noexcept; ```
```c++ float max_load_factor() const noexcept; ```
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max_load_factor
max_load_factor
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---
---
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Returns:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket_count() == 0`.
Returns:返回值：;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if，若 `bucket_count() == 0`. 则返回 `0`。</float></float>
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```c++ float load_factor() const noexcept; ```
```c++ float load_factor() const noexcept; ```
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load_factor
load_factor负载因子
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