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Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
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:1017
---
---
quick_erase
quick_erase
```c++ void quick_erase(const_iterator position); ```
```c++ void quick_erase(const_iterator position); ```
:1024
Erase the element pointed to by `position`.
擦除 `position` 所指向的元素。
:1027
Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated.
抛出：仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出。
在此实现中，此重载不会调用任何函数对象的方法，因此不会抛出异常，但这在其他实现中可能并不成立。
注意：引入此方法是因为从 `erase` 返回指向下一个元素的迭代器成本较高，但容器已经过重新设计，不再存在这种情况。因此，此方法现已弃用。
:1032
---
---
erase_return_void
erase_return_void
```c++ void erase_return_void(const_iterator position); ```
```c++ void erase_return_void(const_iterator position); ```
:1039
Erase the element pointed to by `position`.
擦除 position 所指向的元素。
:1042
Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. + + In this implementation, this overload doesn't call either function object's methods so it is no throw, but this might not be true in other implementations. Notes:;; This method was implemented because returning an iterator to the next element from erase was expensive, but the container has been redesigned so that is no longer the case. So this method is now deprecated.
抛出：仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出。

在此实现中，此重载不会调用任何函数对象的方法，因此不会抛出异常，但这在其他实现中可能并不成立。

注意：引入此方法是因为从 `erase` 返回指向下一个元素的迭代器成本较高，但容器已经过重新设计，不再存在这种情况。因此，此方法现已弃用。
:1047
---
---
swap
交换
```c++ void swap(unordered_multimap& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value && boost::is_nothrow_swappable_v<Hash> && boost::is_nothrow_swappable_v<Pred>); ```
```c++ void swap(unordered_multimap&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value &amp;&amp; boost::is_nothrow_swappable_v<hash> &amp;&amp; boost::is_nothrow_swappable_v<pred>); ```</pred></hash></allocator>
Swaps the contents of the container with the parameter.
交换容器的内容与参数的内容。
:1059
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
如果 `Allocator::propagate_on_container_swap` 被声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
抛出：除非 `key_equal` 或 `hasher` 的拷贝构造函数或拷贝赋值运算符抛出异常，否则不抛出任何异常。
注意：异常规范与 C++11 标准不完全相同，因为相等谓词和哈希函数是使用其拷贝构造函数进行交换的。
:1065
---
---
clear
清空
```c++ void clear() noexcept; ```
```c++ void clear() noexcept; ```
Erases all elements in the container.
擦除容器中的所有元素。
Postconditions:;; `size() == 0` Throws:;; Never throws an exception.
后置条件：`size() == 0`
抛出：永不抛出异常。
:1078
---
---
merge
合并
```c++ template<class H2, class P2> void merge(unordered_multimap<Key, T, H2, P2, Allocator>& source); template<class H2, class P2> void merge(unordered_multimap<Key, T, H2, P2, Allocator>&& source); template<class H2, class P2> void merge(unordered_map<Key, T, H2, P2, Allocator>& source); template<class H2, class P2> void merge(unordered_map<Key, T, H2, P2, Allocator>&& source); ```
```c++ template<class h2,="" class="" p2=""> void merge(unordered_multimap<key, t,="" h2,="" p2,="" allocator="">&amp; source); template<class h2,="" class="" p2=""> void merge(unordered_multimap<key, t,="" h2,="" p2,="" allocator="">&amp;&amp; source); template<class h2,="" class="" p2=""> void merge(unordered_map<key, t,="" h2,="" p2,="" allocator="">&amp; source); template<class h2,="" class="" p2=""> void merge(unordered_map<key, t,="" h2,="" p2,="" allocator="">&amp;&amp; source); ```</key,></class></key,></class></key,></class></key,></class>
Attempt to "merge" two containers by iterating `source` and extracting all nodes in `source` and inserting them into `*this`.
尝试“合并”两个容器：遍历 `source`，提取 `source` 中的所有节点，并将它们插入到 `*this` 中。
Because `source` can have a different hash function and key equality predicate, the key of each node in `source` is rehashed using `this\->hash_function()` and then, if required, compared using `this\->key_eq()`.
由于 `source` 可能具有不同的哈希函数和键相等谓词，因此 `source` 中每个节点的键都会使用 `this-&gt;hash_function()` 重新计算哈希值，然后在必要时使用 `this-&gt;key_eq()` 进行比较。
The behavior of this function is undefined if `this\->get_allocator() != source.get_allocator()`.
如果 `this-&gt;get_allocator() != source.get_allocator()`，则此函数的行为未定义。
This function does not copy or move any elements and instead simply relocates the nodes from `source` into `*this`.
此函数不会拷贝或移动任何元素，而是仅仅将节点从 `source` 重新定位到 `*this` 中。
Notes:;; + --
注意:;; + --
Pointers and references to transferred elements remain valid.
指向被转移元素的指针和引用保持有效。
Invalidates iterators to transferred elements.
使被转移元素的迭代器失效。
English Chinese (Simplified Han script) Actions
Insert with `node_handle`
通过 `node_handle` 插入
```c++ iterator insert(node_type&& nh); ```
```c++ iterator insert(node_type&amp;&amp; nh); ```
Insert with Hint and `node_handle`
带提示和 `node_handle` 的插入
```c++ iterator insert(const_iterator hint, node_type&& nh); ```
```c++ iterator insert(const_iterator hint, node_type&amp;&amp; nh); ```
Erase by Position
通过位置擦除
```c++ iterator erase(iterator position); iterator erase(const_iterator position); ```
```c++ iterator erase(iterator position); iterator erase(const_iterator position); ```
Erase by Key
通过键擦除
Erase all elements with key equivalent to `k`.
擦除所有键与 `k` 等价的元素。
Erase Range
范围擦除
```c++ iterator erase(const_iterator first, const_iterator last); ```
```c++ iterator erase(const_iterator first, const_iterator last); ```
quick_erase
quick_erase
erase_return_void
erase_return_void
```c++ void erase_return_void(const_iterator position); ```
```c++ void erase_return_void(const_iterator position); ```
swap
交换
Swaps the contents of the container with the parameter.
交换容器的内容与参数的内容。
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
抛出：除非 `key_equal` 或 `hasher` 的拷贝构造函数或拷贝赋值运算符抛出异常，否则不抛出任何异常。
注意：异常规范与 C++11 标准不完全相同，因为相等谓词和哈希函数是使用其拷贝构造函数进行交换的。
Erases all elements in the container.
擦除容器中的所有元素。
Attempt to "merge" two containers by iterating `source` and extracting all nodes in `source` and inserting them into `*this`.
尝试“合并”两个容器：遍历 `source`，提取 `source` 中的所有节点，并将它们插入到 `*this` 中。
The behavior of this function is undefined if `this\->get_allocator() != source.get_allocator()`.
如果 `this-&gt;get_allocator() != source.get_allocator()`，则此函数的行为未定义。
This function does not copy or move any elements and instead simply relocates the nodes from `source` into `*this`.
此函数不会拷贝或移动任何元素，而是仅仅将节点从 `source` 重新定位到 `*this` 中。
Notes:;; + --
注意:;; + --
Iterators to non-transferred elements in `source` remain valid.
指向 `source` 中未被转移元素的迭代器保持有效。
--
--
hash_function
哈希函数
``` hasher hash_function() const; ```
``` hasher hash_function() const; ```
find
find
Requires:;; `n < bucket_count()` Returns:;; The number of elements in bucket `n`.
要求：`n &lt; bucket_count()`
返回：桶 `n` 中的元素数量。
Returns:;; An iterator pointing to an element with key equivalent to `k`, or `b.end()` if no such element exists. Notes:;; The templated overloads containing `CompatibleKey`, `CompatibleHash` and `CompatiblePredicate` are non-standard extensions which allow you to use a compatible hash function and equality predicate for a key of a different type in order to avoid an expensive type cast. In general, its use is not encouraged and instead the `K` member function templates should be used. + + 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.
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 `b.end()`。
注意：包含 `CompatibleKey`、`CompatibleHash` 和 `CompatiblePredicate` 的模板化重载是非标准扩展，允许您为不同类型的键使用兼容的哈希函数和相等谓词，以避免昂贵的类型转换。通常不鼓励使用它们，而应使用 `K` 成员函数模板。 `template<class k="">` 重载仅在 `Hash::is_transparent` `Pred::is_transparent` 是有效的成员 typedef 时参与重载决议。库假定 `Hash` 可同时使用 `K` 和 `Key` 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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Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of抛出：除非 `key_equal` or或 `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors. 的拷贝构造函数或拷贝赋值运算符抛出异常，否则不抛出任何异常。
注意：异常规范与 C++11 标准不完全相同，因为相等谓词和哈希函数是使用其拷贝构造函数进行交换的。
06/05/2026
User avatar admin

String added in the repository
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
06/05/2026
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String information

Flags
safe-html, strict-same
Unit identifier
51597
Source string location
:1062
String age
06/05/2026
Last updated
06/06/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/modules/ROOT/pages/reference/unordered_multimap_zh_Hans.adoc, string 279