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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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Hash Policy
Hash Policy哈希策略
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---
---
:1712
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Returns:;; The size of the bucket array.
Returns:;; The size of the bucket array.返回值：;; 桶数组的大小。
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```c++ size_type bucket_count() const noexcept; ```
```c++ size_type bucket_count() const noexcept; ```
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bucket_count
bucket_count
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Bucket Interface
Bucket Interface桶接口
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---
---
:1701
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Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. Notes:;; The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.
Returns:;; A boolean indicating whether or not there is an element with key equal to `k` in the table. Notes:;; The `template<class K>` overload only participates in overload resolution if返回值：;; 布尔值，表示表中是否存在键等于 `k` 的元素。
注意：;; 仅当 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both是有效的成员类型别名时，`template<class k="">` 重载版本才参与重载决议。库假定 `Hash` 可同时接受 `K` and类型与 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.类型作为参数，且 `Pred` 是透明的。这支持异构查找，从而避免实例化 `Key` 类型对象带来的性能开销。
在存在并发插入操作的情况下，返回的值可能无法精确反映执行后容器的真实状态。</class>
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```c++ bool contains(const key_type& k) const; template<class K> bool contains(const K& k) const; ```
```c++ bool contains(const key_type&amp; k) const; template<class Kk=""> bool contains(const K&amp; k) const; ```</class>
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contains
contains包含
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---
---
:1685
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Returns:;; The number of elements with key equivalent to `k` (0 or 1). Notes:;; The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. + + 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 number of elements with key equivalent to `k` (0 or 1). Notes:;; The `template<class K>` overload only participates in overload resolution if返回值：;; 与键 `k` 等价的元素数量（值为 0 或 1）。
注意：;; 仅当 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both是有效的成员类型别名时，`template<class k="">` 重载版本才参与重载决议。库假定 `Hash` 可同时接受 `K` and类型与 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. + + In the presence of concurrent insertion operations, the value returned may not accurately reflect the true state of the table right after execution.类型作为参数，且 `Pred` 是透明的。这支持异构查找，从而避免实例化 `Key` 类型对象带来的性能开销。
在存在并发插入操作的情况下，返回的值可能无法精确反映执行后容器的真实状态。</class>
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```c++ size_type count(const key_type& k) const; template<class K> size_type count(const K& k) const; ```
```c++ size_type count(const key_type&amp; k) const; template<class Kk=""> size_type count(const K&amp; k) const; ```</class>
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count
count
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Map Operations
Map Operations映射操作
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---
---
:1667
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Returns:;; The table's key equality predicate.
Returns:;; The table's key equality predicate.返回值：;; 表的键相等性谓词。
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