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```c++ mapped_type& operator[](const key_type& k); mapped_type& operator[](key_type&& k); template<class K> mapped_type& operator[](K&& k); ```
```c++ mapped_type&amp; operator[](const key_type&amp; k); mapped_type&amp; operator[](key_type&&amp;&amp; k); template<class Kk=""> mapped_type&amp; operator[](K&& k); ```amp;&amp; k); ```</class>
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operator++[++++]++
operator++[++++]++
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---
---
:1357
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Returns:;; A range containing all elements with key equivalent to `k`. If the container doesn't contain any such elements, returns `std::make_pair(b.end(), b.end())`. Notes:;; The `template<class K>` overloads only participate 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.
Returns:;; A range containing all elements with key equivalent to `k`. If the container doesn't contain any such elements, returns返回：包含所有键与 `k` 等价的元素的范围。如果容器不包含任何此类元素，则返回 `std::make_pair(b.end(), b.end())`. Notes:;; The 。
注意：`template<class K>` overloads only participate in overload resolution ifk="">` 重载仅在 `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 typedef 时参与重载决议。库假定 `Hash` 可同时使用 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</class>
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```c++ std::pair<iterator, iterator> equal_range(const key_type& k); std::pair<const_iterator, const_iterator> equal_range(const key_type& k) const; template<class K> std::pair<iterator, iterator> equal_range(const K& k); template<class K> std::pair<const_iterator, const_iterator> equal_range(const K& k) const; ```
```c++ std::pair<iterator, iterator=""> equal_range(const key_type&amp; k); std::pair<const_iterator, const_iterator=""> equal_range(const key_type&amp; k) const; template<class Kk=""> std::pair<iterator, iterator=""> equal_range(const K&amp; k); template<class Kk=""> std::pair<const_iterator, const_iterator=""> equal_range(const K&amp; k) const; ```</const_iterator,></class></iterator,></class></const_iterator,></iterator,>
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equal_range
equal_range
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---
---
:1341
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Returns:;; A boolean indicating whether or not there is an element with key equal to `key` in the container 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.
Returns:;; A boolean indicating whether or not there is an element with key equal to `key` in the container Notes:;; The `template<class K>` overload only participates in overload resolution if返回：一个布尔值，指示容器中是否存在键等于 `key` 的元素。
注意：`template<class k="">` 重载仅在 `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 typedef 时参与重载决议。库假定 `Hash` 可同时使用 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</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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---
---
:1328
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Returns:;; The number of elements with key equivalent to `k`. 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.
Returns:;; The number of elements with key equivalent to `k`. Notes:;; The `template<class K>` overload only participates in overload resolution if返回：键与 `k` 等价的元素数量。
注意：`template<class k="">` 重载仅在 `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 typedef 时参与重载决议。库假定 `Hash` 可同时使用 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</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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---
---
:1315
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Returns:;; An iterator pointing to an element with key equivalent to `k`, or `end()` if no such element exists. Notes:;; The `template<class K>` overloads only participate 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.
Returns:;; An iterator pointing to an element with key equivalent to `k`, or `end()` if no such element exists. Notes:;; The `template<class K>` overloads only participate in overload resolution if返回：指向键与 `k` 等价的元素的迭代器；如果不存在这样的元素，则返回 `end()`。
注意：`template<class k="">` 重载仅在 `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 typedef 时参与重载决议。库假定 `Hash` 可同时使用 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</class>
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```
```
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```c++ iterator find(const key_type& k); const_iterator find(const key_type& k) const; template<class K> iterator find(const K& k);
```c++ iterator find(const key_type&amp; k); const_iterator find(const key_type&amp; k) const; template<class Kk=""> iterator find(const K& k);amp; k);</class>
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find
find
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Lookup
Lookup查找
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