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Constructs an empty container 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.
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:391
Requires:;; If the defaults are used, `hasher`, `key_equal` and `allocator_type` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：如果使用默认值，则 `hasher`、`key_equal` 和 `allocator_type` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
:393
---
---
Copy Constructor
复制构造函数
```c++ unordered_multimap(const unordered_multimap& other); ```
```c++ unordered_multimap(const unordered_multimap& other); ```
The copy constructor. Copies the contained elements, hash function, predicate, maximum load factor and allocator.
拷贝构造函数。拷贝所包含的元素、哈希函数、谓词、最大负载因子和分配器。
If `Allocator::select_on_container_copy_construction` exists and has the right signature, the allocator will be constructed from its result.
如果 `Allocator::select_on_container_copy_construction` 存在且具有正确的签名，则分配器将根据其结果进行构造。
:405
Requires:;; `value_type` is copy constructible
要求：`value_type` 可拷贝构造。
:407
---
---
Move Constructor
移动构造函数
```c++ unordered_multimap(unordered_multimap&& other); ```
```c++ unordered_multimap(unordered_multimap&& other); ```
The move constructor.
移动构造函数。
Notes:;; This is implemented using Boost.Move. Requires:;; `value_type` is move-constructible.
注意：此函数使用 Boost.Move 实现。
要求：`value_type` 可移动构造。
:420
---
---
Iterator Range Constructor with Allocator
带分配器的迭代器范围构造函数
```c++ template<class InputIterator> unordered_multimap(InputIterator f, InputIterator l, const allocator_type& a); ```
```c++ template<class inputiterator=""> unordered_multimap(InputIterator f, InputIterator l, const allocator_type&amp; a); ```</class>
Constructs an empty container 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.
使用 `a` 作为分配器，以默认哈希函数、默认键相等谓词和最大负载因子 `1.0` 构造一个空容器，并将 `[f, l)` 范围内的元素插入其中。
:431
Requires:;; `hasher`, `key_equal` need to be https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^].
要求：`hasher`、`key_equal` 需要满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^]。
:433
---
---
Allocator Constructor
分配器构造函数
```c++ explicit unordered_multimap(const Allocator& a); ```
```c++ explicit unordered_multimap(const Allocator&amp; a); ```
Constructs an empty container, using allocator `a`.
使用分配器 `a` 构造一个空容器。
:442
---
---
Copy Constructor with Allocator
带分配器的复制构造函数
```c++ unordered_multimap(const unordered_multimap& other, const Allocator& a); ```
```c++ unordered_multimap(const unordered_multimap&amp; other, const Allocator&amp; a); ```
Constructs an container, copying ``other``'s contained elements, hash function, predicate, maximum load factor, but using allocator `a`.
构造一个容器，拷贝 `other` 所包含的元素、哈希函数、谓词和最大负载因子，但使用分配器 `a`。
:451
---
---
Move Constructor with Allocator
带分配器的移动构造函数
```c++ unordered_multimap(unordered_multimap&& other, const Allocator& a); ```
```c++ unordered_multimap(unordered_multimap&amp;&amp; other, const Allocator&amp; a); ```
Construct a container moving ``other``'s contained elements, and having the hash function, predicate and maximum load factor, but using allocate `a`.
构造一个容器，移动 `other` 所包含的元素，并使用其哈希函数、谓词和最大负载因子，但使用分配器 `a`。
Notes:;; This is implemented using Boost.Move. Requires:;; `value_type` is move insertable.
注意：此函数使用 Boost.Move 实现。
要求：`value_type` 可移动插入。
:464
---
---
English Chinese (Simplified Han script) Actions
An iterator whose value type is `value_type`.
一种迭代器，其值类型为 `value_type` 。
Convertible to `const_iterator`.
可转换为 `const_iterator` 。
A constant iterator whose value type is `value_type`.
一个常量迭代器，其值类型为 `value_type` 。
An iterator with the same value type, difference type and pointer and reference type as iterator.
一种迭代器，其值类型、差值类型以及指针和引用类型均与 iterator 相同。
A `local_iterator` object can be used to iterate through a single bucket.
`local_iterator` 对象可用于遍历单个桶内的元素。
A constant iterator with the same value type, difference type and pointer and reference type as const_iterator.
一个常量迭代器，其值类型、差类型、指针类型和引用类型与 `const_iterator` 相同。
A const_local_iterator object can be used to iterate through a single bucket.
`const_local_iterator` 对象可用于遍历单个桶。
See node_handle_map for details.
详见 `node_handle_map`。
Constructors
构造函数
Default Constructor
默认构造函数
If `Allocator::select_on_container_copy_construction` exists and has the right signature, the allocator will be constructed from its result.
如果 `Allocator::select_on_container_copy_construction` 存在且具有正确的签名，则分配器将根据其结果进行构造。
Move Constructor
移动构造函数
Notes:;; This is implemented using Boost.Move. Requires:;; `value_type` is move-constructible.
注意：此函数使用 Boost.Move 实现。
要求：`value_type` 可移动构造。
Iterator Range Constructor with Allocator
带分配器的迭代器范围构造函数
```c++ template<class InputIterator> unordered_multimap(InputIterator f, InputIterator l, const allocator_type& a); ```
```c++ template<class inputiterator=""> unordered_multimap(InputIterator f, InputIterator l, const allocator_type&amp; a); ```</class>
Constructs an empty container 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.
使用 `a` 作为分配器，以默认哈希函数、默认键相等谓词和最大负载因子 `1.0` 构造一个空容器，并将 `[f, l)` 范围内的元素插入其中。
```c++ explicit unordered_multimap(const Allocator& a); ```
```c++ explicit unordered_multimap(const Allocator&amp; a); ```
Copy Constructor with Allocator
带分配器的复制构造函数
Constructs an container, copying ``other``'s contained elements, hash function, predicate, maximum load factor, but using allocator `a`.
构造一个容器，拷贝 `other` 所包含的元素、哈希函数、谓词和最大负载因子，但使用分配器 `a`。
Move Constructor with Allocator
带分配器的移动构造函数
```c++ unordered_multimap(unordered_multimap&& other, const Allocator& a); ```
```c++ unordered_multimap(unordered_multimap&amp;&amp; other, const Allocator&amp; a); ```
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
Construct a container moving ``other``'s contained elements, and having the hash function, predicate and maximum load factor, but using allocate `a`.
构造一个容器，移动 `other` 所包含的元素，并使用其哈希函数、谓词和最大负载因子，但使用分配器 `a`。
Notes:;; This is implemented using Boost.Move. Requires:;; `value_type` is move insertable.
注意：此函数使用 Boost.Move 实现。
要求：`value_type` 可移动插入。
Initializer List Constructor
初始化列表构造函数
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, `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、 `eql` 作为键相等性谓词、及 `a` 作为分配器，并设置最大负载因子为 `1.0` ，随后将 `il` 中的元素插入该容器。
Bucket Count Constructor with Allocator
带分配器的桶数构造函数
```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^]。

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Translation uploaded
Constructs an empty container 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.
Constructs an empty container 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.使用 `a` 作为分配器，以默认哈希函数、默认键相等谓词和最大负载因子 `1.0` 构造一个空容器，并将 `[f, l)` 范围内的元素插入其中。
06/05/2026
User avatar admin

String added in the repository
Constructs an empty container 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.
Constructs an empty container 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.
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
51386
Source string location
:428
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 68