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Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
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Iterator Range Constructor with Bucket Count and Allocator
带桶数和分配器的迭代器范围构造函数
Constructs an empty container with at least `n` buckets, using `a` as the allocator, with the default hash function and key equality predicate and a maximum load factor of `1.0` and inserts the elements from `[f, l)` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `a` 作为分配器，使用默认的哈希函数、默认的键相等谓词以及最大负载因子 `1.0`，并将 `[f, l)` 范围内的元素插入其中。
:507
Requires:;; `hasher`, `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求;; `hasher` 和 `key_equal` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造] 要求。
:509
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Iterator Range Constructor with Bucket Count and Hasher
带桶数和哈希函数的迭代器范围构造函数
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator, with the default key equality predicate and a maximum load factor of `1.0` and inserts the elements from `[f, l)` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数、默认的键相等性谓词、 `a` 作为分配器，并设置最大负载因子为 `1.0` ，随后将区间 `[f, l)` 中的元素插入该容器。
:522
Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求;; `key_equal` 需满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造] 要求。
:524
---
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initializer_list Constructor with Allocator
带分配器的初始化列表构造函数
```c++ unordered_multiset(std::initializer_list<value_type> il, const allocator_type& a); ```
```c++ unordered_multiset(std::initializer_list<value_type> il, const allocator_type&amp; a); ```</value_type>
Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
使用 `a` 作为分配器，最大负载因子为 `1.0`，构造一个空容器，并将 `il` 中的元素插入其中。
:535
Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`hasher` 和 `key_equal` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
:537
---
---
initializer_list Constructor with Bucket Count and Allocator
带桶数和分配器的初始化列表构造函数
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const allocator_type& a) ```
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const allocator_type&amp; a) ```</value_type>
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `a` 作为分配器，最大负载因子为 `1.0`，并将 `il` 中的元素插入其中。
:548
Requires:;; `hasher` and `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`hasher` 和 `key_equal` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
:550
---
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initializer_list Constructor with Bucket Count and Hasher and Allocator
带桶数、哈希函数和分配器的初始化列表构造函数
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const hasher&amp; hf, const allocator_type&amp; a); ```</value_type>
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，`a` 作为分配器，最大负载因子为 `1.0`，并将 `il` 中的元素插入其中。
:562
Requires:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`key_equal` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
:564
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Destructor
析构函数
```c++ ~unordered_multiset(); ```
```c++ ~unordered_multiset(); ```
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。
:575
---
---
Assignment
赋值操作
Copy Assignment
复制赋值
```c++ unordered_multiset& operator=(const unordered_multiset& other); ```
```c++ unordered_multiset&amp; operator=(const unordered_multiset&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。
English Chinese (Simplified Han script) Actions
`Key` must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container (i.e. `allocator_traits` can destroy it).
`Key` 必须可以从容器中 https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^]（即 `allocator_traits` 能够销毁它）。
Bucket Count Constructor with Allocator
带分配器的桶数构造函数
```c++ unordered_multiset(size_type n, const allocator_type& a); ```
```c++ unordered_multiset(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`。
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default 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:;; `key_equal` needs to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
后置条件：`size() == 0` 要求：`key_equal` 需要满足https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
Iterator Range Constructor with Bucket Count and Allocator
带桶数和分配器的迭代器范围构造函数
Constructs an empty container with at least `n` buckets, using `a` as the allocator, with the default hash function and key equality predicate and a maximum load factor of `1.0` and inserts the elements from `[f, l)` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `a` 作为分配器，使用默认的哈希函数、默认的键相等谓词以及最大负载因子 `1.0`，并将 `[f, l)` 范围内的元素插入其中。
Iterator Range Constructor with Bucket Count and Hasher
带桶数和哈希函数的迭代器范围构造函数
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `a` as the allocator, with the default key equality predicate and a maximum load factor of `1.0` and inserts the elements from `[f, l)` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数、默认的键相等性谓词、 `a` 作为分配器，并设置最大负载因子为 `1.0` ，随后将区间 `[f, l)` 中的元素插入该容器。
initializer_list Constructor with Allocator
带分配器的初始化列表构造函数
```c++ unordered_multiset(std::initializer_list<value_type> il, const allocator_type& a); ```
```c++ unordered_multiset(std::initializer_list<value_type> il, const allocator_type&amp; a); ```</value_type>
Constructs an empty container using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
使用 `a` 作为分配器，最大负载因子为 `1.0`，构造一个空容器，并将 `il` 中的元素插入其中。
initializer_list Constructor with Bucket Count and Allocator
带桶数和分配器的初始化列表构造函数
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const allocator_type& a) ```
```c++ unordered_multiset(std::initializer_list<value_type> il, size_type n, const allocator_type&amp; a) ```</value_type>
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
构造一个至少包含 `n` 个桶的空容器，使用 `a` 作为分配器，最大负载因子为 `1.0`，并将 `il` 中的元素插入其中。
```c++ size_type size() const noexcept; ```
```c++ size_type size() const noexcept; ```
Returns:;; `std::distance(begin(), end())`
返回：`std::distance(begin(), end())`。
max_size
max_size
```c++ size_type max_size() const noexcept; ```
```c++ size_type max_size() const noexcept; ```
Modifiers
修改器
emplace
原地构造
```c++ template<class... Args> iterator emplace(Args&&... args); ```
```c++ template<class... args=""> iterator emplace(Args&amp;&amp;... args); ```</class...>
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; An iterator pointing to the 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.
要求：`value_type` 满足 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[可移动插入^]。
返回：指向已插入元素的迭代器。
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。
Inserts a range of elements into the container.
将一个范围内的元素插入容器中。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `*first`. Throws:;; When inserting a single element, 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.
要求：`value_type` 必须可以从 `*first` 出发在 `X` 中进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^]。
抛出：当插入单个元素时，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。
Insert Initializer List
初始化列表插入
Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
将一个范围内的元素插入容器中。当且仅当容器中没有具有等价键的元素时，才会插入这些元素。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container. Throws:;; When inserting a single element, 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.
要求：`value_type` 可以在容器中进行 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可拷贝插入^]。
抛出：当插入单个元素时，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。
Extract by Iterator
通过迭代器提取

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Translation uploaded
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.构造一个至少包含 `n` 个桶的空容器，使用 `a` 作为分配器，最大负载因子为 `1.0`，并将 `il` 中的元素插入其中。
06/05/2026
User avatar admin

String added in the repository
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
Constructs an empty container with at least `n` buckets, using `a` as the allocator and a maximum load factor of 1.0 and inserts the elements from `il` into it.
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
54646
Source string location
:545
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_multiset_zh_Hans.adoc, string 111