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Invalidates iterators, pointers and references, and changes the order of elements.
Invalidates iterators, pointers and references, and changes the order of elements.使迭代器、指针和引用失效，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，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()))`.
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：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。
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Invalidates iterators, pointers and references, and changes the order of elements.
Invalidates iterators, pointers and references, and changes the order of elements.使迭代器、指针和引用失效，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.将释放底层桶数组。如果提供的分配器使用花式指针，则随后会执行一次默认分配。
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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如有必要，将改变桶数组的大小，使其至少包含 `n` 个桶，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的 `bucket_++_++count()` associated with the container.。
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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：在不进行 rehash 的前提下，容器所能容纳的最大元素数量（假设不会有更多元素被擦除）。注意：在构造、rehash 或清空之后，容器的最大负载至少为 `max_load_factor() * bucket_count()`。在高负载条件下，该值可能因擦除操作而减小。
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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++_++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_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。为与 `boost::unordered_map`. 保持兼容而保留。
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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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