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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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---
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:1491
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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：;; 键与 `k` 等价的元素数量（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为合法成员类型别名时，`template<class k="">` 重载才参与重载决议。标准库假定 `Hash` 可同时接收 `K` and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.类型参数调用，且 `Pred` 是透明的。该机制支持异构查找，避免了实例化 `Key` 类型对象的开销。
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。</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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Set Operations
Set Operations集合操作
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---
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:1473
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Returns:;; The table's key equality predicate.
Returns:;; The table's key equality predicate.返回值：;; 表的键相等性断言。
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``` key_equal key_eq() const; ```
``` key_equal key_eq() const; ```
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key_eq
key_eq
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---
---
:1463
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Returns:;; The table's hash function.
Returns:;; The table's hash function.返回值：;; 表的哈希函数。
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``` hasher hash_function() const; ```
``` hasher hash_function() const; ```
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hash_function
hash_function哈希函数
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---
---
:1453
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Returns:;; The table's allocator.
Returns:;; The table's allocator.返回值：;; 表的分配器。
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``` allocator_type get_allocator() const noexcept; ```
``` allocator_type get_allocator() const noexcept; ```
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get_allocator
get_allocator
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Observers
Observers观察器
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