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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参数类型指的是由该推导指引所推导出的容器类型的 `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它具有一个 `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，并且为该参数推导出的类型不符合输入迭代器的要求。
- 它具有一个 `Allocator` 模板参数，并且为该参数推导出的类型不符合分配器的要求。
- 它具有一个 `Hash` 模板参数，并且为该参数推导出的类型是整数类型或符合分配器的要求。
- 它具有一个 `Pred` 模板参数，并且为该参数推导出的类型符合分配器的要求。
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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:如果满足以下任一条件，则推导指引不会参与重载决议：
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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：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. 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。
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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()))`, 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 >；如果 `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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:1309
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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.当 `size() == 0` 时， `rehash(0)` 将释放底层桶数组。
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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。
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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.将释放底层的桶数组。
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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.更改桶的数量，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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:1293
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