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Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
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:586
---
---
Assignment
赋值操作
Copy Assignment
拷贝赋值
```c++ unordered_multimap& operator=(const unordered_multimap& other); ```
```c++ unordered_multimap& operator=(const unordered_multimap& other); ```
The assignment operator. Copies the contained elements, hash function, predicate and maximum load factor but not the allocator.
赋值运算符。拷贝所包含的元素、哈希函数、谓词和最大负载因子，但不拷贝分配器。
If `Alloc::propagate_on_container_copy_assignment` exists and `Alloc::propagate_on_container_copy_assignment::value` is `true`, the allocator is overwritten, if not the copied elements are created using the existing allocator.
如果 `Alloc::propagate_on_container_copy_assignment` 存在且 `Alloc::propagate_on_container_copy_assignment::value` 为 `true`，则分配器会被覆盖；否则，拷贝的元素将使用现有的分配器创建。
:601
Requires:;; `value_type` is copy constructible
要求：`value_type` 可拷贝构造。
:603
---
---
Move Assignment
移动赋值
```c++ unordered_multimap& operator=(unordered_multimap&& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value && boost::is_nothrow_move_assignable_v<Hash> && boost::is_nothrow_move_assignable_v<Pred>); ``` The move assignment operator.
```c++ unordered_multimap&amp; operator=(unordered_multimap&amp;&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value &amp;&amp; boost::is_nothrow_move_assignable_v<hash> &amp;&amp; boost::is_nothrow_move_assignable_v<pred>); ``` The move assignment operator.</pred></hash></allocator>
If `Alloc::propagate_on_container_move_assignment` exists and `Alloc::propagate_on_container_move_assignment::value` is `true`, the allocator is overwritten, if not the moved elements are created using the existing allocator.
如果 `Alloc::propagate_on_container_move_assignment` 存在且 `Alloc::propagate_on_container_move_assignment::value` 为 `true`，则分配器会被覆盖；否则，移动的元素将使用现有的分配器创建。
Requires:;; `value_type` is move constructible.
要求：`value_type` 可移动构造。
:619
---
---
Initializer List Assignment
初始化列表赋值
```c++ unordered_multimap& operator=(std::initializer_list<value_type> il); ```
```c++ unordered_multimap&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container and https://en.cppreference.com/w/cpp/named_req/CopyAssignable[CopyAssignable^].
要求：`value_type` 必须能够从容器中 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可拷贝插入^] 并且满足 https://en.cppreference.com/w/cpp/named_req/CopyAssignable[可拷贝赋值^]。
Iterators
迭代器
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begin
开始
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
Returns:;; An iterator referring to the first element of the container, or if the container is empty the past-the-end value for the container.
返回：指向容器第一个元素的迭代器，如果容器为空则返回容器的尾后迭代器。
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---
---
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end
结束
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
Returns:;; An iterator which refers to the past-the-end value for the container.
返回：指向容器尾后值的迭代器。
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---
---
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cbegin
cbegin
```c++ const_iterator cbegin() const noexcept; ```
```c++ const_iterator cbegin() const noexcept; ```
Returns:;; A `const_iterator` referring to the first element of the container, or if the container is empty the past-the-end value for the container.
返回：指向容器第一个元素的 `const_iterator`，如果容器为空则返回容器的尾后值。
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---
---
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cend
cend
English Chinese (Simplified Han script) Actions
```c++ unordered_multimap(size_type n, const allocator_type& a); ```
```c++ unordered_multimap(size_type n, const allocator_type&amp; a); ```
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default hash function and key equality predicate, `a` as the allocator and a maximum load factor of `1.0`.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，使用默认的哈希函数和键相等谓词，`a` 作为分配器，以及最大负载因子 `1.0`。
Postconditions:;; `size() == 0` Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0`
要求：`hasher` 和 `key_equal` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
Destructor
析构函数
```c++ ~unordered_multimap(); ```
```c++ ~unordered_multimap(); ```
Note:;; The destructor is applied to every element, and all memory is deallocated
注意：析构函数会应用于每个元素，并且所有内存都会被释放。
Assignment
赋值操作
Copy Assignment
拷贝赋值
```c++ unordered_multimap& operator=(const unordered_multimap& other); ```
```c++ unordered_multimap&amp; operator=(const unordered_multimap&amp; other); ```
The assignment operator. Copies the contained elements, hash function, predicate and maximum load factor but not the allocator.
赋值运算符。拷贝所包含的元素、哈希函数、谓词和最大负载因子，但不拷贝分配器。
If `Alloc::propagate_on_container_copy_assignment` exists and `Alloc::propagate_on_container_copy_assignment::value` is `true`, the allocator is overwritten, if not the copied elements are created using the existing allocator.
如果 `Alloc::propagate_on_container_copy_assignment` 存在且 `Alloc::propagate_on_container_copy_assignment::value` 为 `true`，则分配器会被覆盖；否则，拷贝的元素将使用现有的分配器创建。
Move Assignment
移动赋值
```c++ unordered_multimap& operator=(unordered_multimap&& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value && boost::is_nothrow_move_assignable_v<Hash> && boost::is_nothrow_move_assignable_v<Pred>); ``` The move assignment operator.
```c++ unordered_multimap&amp; operator=(unordered_multimap&amp;&amp; other) noexcept(boost::allocator_traits<allocator>::is_always_equal::value &amp;&amp; boost::is_nothrow_move_assignable_v<hash> &amp;&amp; boost::is_nothrow_move_assignable_v<pred>); ``` The move assignment operator.</pred></hash></allocator>
If `Alloc::propagate_on_container_move_assignment` exists and `Alloc::propagate_on_container_move_assignment::value` is `true`, the allocator is overwritten, if not the moved elements are created using the existing allocator.
如果 `Alloc::propagate_on_container_move_assignment` 存在且 `Alloc::propagate_on_container_move_assignment::value` 为 `true`，则分配器会被覆盖；否则，移动的元素将使用现有的分配器创建。
Requires:;; `value_type` is move constructible.
要求：`value_type` 可移动构造。
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container and https://en.cppreference.com/w/cpp/named_req/CopyAssignable[CopyAssignable^].
要求：`value_type` 必须能够从容器中 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可拷贝插入^] 并且满足 https://en.cppreference.com/w/cpp/named_req/CopyAssignable[可拷贝赋值^]。
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
Returns:;; An iterator referring to the first element of the container, or if the container is empty the past-the-end value for the container.
返回：指向容器第一个元素的迭代器，如果容器为空则返回容器的尾后迭代器。
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ const_iterator cbegin() const noexcept; ```
```c++ const_iterator cbegin() const noexcept; ```
Returns:;; A `const_iterator` referring to the first element of the container, or if the container is empty the past-the-end value for the container.
返回：指向容器第一个元素的 `const_iterator`，如果容器为空则返回容器的尾后值。
Requires:;; `nh` is empty or `nh.get_allocator()` is equal to the container's allocator. Returns:;; If `nh` was empty, returns `end()`. + + Otherwise returns an iterator pointing to the newly inserted element. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated. + + This can be used to insert a node extracted from a compatible `unordered_map`.
要求：`nh` 为空，或者 `nh.get_allocator()` 等于容器的分配器。
返回：如果 `nh` 为空，则返回 `end()`。
否则，返回指向新插入元素的迭代器。
抛出：如果除调用 `hasher` 之外的操作抛出异常，则该函数无效果。
注意：可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
此函数可用于插入从兼容的 `unordered_map` 中提取的节点。
``` allocator_type get_allocator() const; ```
``` allocator_type get_allocator() const; ```
Returns:;; The container's hash function.
返回：容器的哈希函数。
key_eq
key_eq
Requires:;; `nh` is empty or `nh.get_allocator()` is equal to the container's allocator. Returns:;; If `nh` was empty, returns `end()`. + + Otherwise returns an iterator pointing to the newly inserted element. Throws:;; If an exception is thrown by an operation other than a call to hasher the function has no effect. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated. + + This can be used to insert a node extracted from a compatible `unordered_map`.
要求：`nh` 为空，或者 `nh.get_allocator()` 等于容器的分配器。
返回：如果 `nh` 为空，则返回 `end()`；否则，返回指向新插入元素的迭代器。
抛出：如果除调用 `hasher` 之外的操作抛出异常，则该函数无效果。
注意：标准关于 `hint` 的含义表述相当模糊。但唯一实际的使用方式，也是 Boost.Unordered 支持的唯一方式，是将其指向一个具有相同键的已存在元素。
可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
此函数可用于插入从兼容的 `unordered_map` 中提取的节点。
Returns:;; The iterator following `position` before the erasure. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. Notes:;; In older versions this could be inefficient because it had to search through several buckets to find the position of the returned iterator. The data structure has been changed so that this is no longer the case, and the alternative erase methods have been deprecated.
返回：`position` 在被擦除之前的后一个迭代器。
抛出：仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出。
注意：在旧版本中，此操作可能效率较低，因为它需要搜索多个桶以找到返回迭代器的位置。数据结构已经更改，不再是这种情况，并且备用的擦除方法已被弃用。
Returns:;; The number of elements erased. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. Notes:;; The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs and neither `iterator` nor `const_iterator` are implicitly convertible from `K`. 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：被擦除的元素数量。
抛出：仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出。
注意：`template<class k="">` 重载仅在 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef，且 `iterator` 和 `const_iterator` 都不能从 `K` 隐式转换时参与重载决议。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>
```c++ void quick_erase(const_iterator position); ```
```c++ void quick_erase(const_iterator position); ```

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Translation uploaded
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。
06/05/2026
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Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
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String information

Flags
safe-html, strict-same
Unit identifier
51457
Source string location
:626
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 139