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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.
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Bucket Count Constructor with Hasher and Allocator
带哈希函数和分配器的桶数构造函数
```c++ unordered_multimap(size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_multimap(size_type n, const hasher& hf, const allocator_type& a); ```
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^]。
:506
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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。
:518
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^]。
:520
---
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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。
:533
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。
:535
---
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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_multimap(std::initializer_list<value_type> il, const allocator_type& a); ```
```c++ unordered_multimap(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。
:546
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^]。
:548
---
---
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_multimap(std::initializer_list<value_type> il, size_type n, const allocator_type& a); ```
```c++ unordered_multimap(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.
使用 `a` 作为分配器，最大负载因子为 `1.0`，构造一个至少包含 `n` 个桶的空容器，并将 `il` 中的元素插入其中。
:559
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^]。
:561
---
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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_multimap(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_multimap(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。
:573
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^]。
:575
---
---
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。
English Chinese (Simplified Han script) Actions
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`.
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` 作为键相等谓词，`a` 作为分配器，以及最大负载因子 `1.0`。
Iterator Range Constructor
迭代器范围构造函数
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 `[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，`eql` 作为键相等谓词，`a` 作为分配器，以及最大负载因子 `1.0`，并将 `[f, l)` 范围内的元素插入其中。
```c++ unordered_multimap(const unordered_multimap& other); ```
```c++ unordered_multimap(const unordered_multimap&amp; other); ```
get_allocator
get_allocator
Class Template unordered_multimap
类模板 unordered_multimap
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。
Bucket Count Constructor with Hasher and Allocator
带哈希函数和分配器的桶数构造函数
```c++ unordered_multimap(size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_multimap(size_type n, const hasher&amp; hf, const allocator_type&amp; a); ```
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`。
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_multimap(std::initializer_list<value_type> il, const allocator_type& a); ```
```c++ unordered_multimap(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_multimap(std::initializer_list<value_type> il, size_type n, const allocator_type& a); ```
```c++ unordered_multimap(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.
使用 `a` 作为分配器，最大负载因子为 `1.0`，构造一个至少包含 `n` 个桶的空容器，并将 `il` 中的元素插入其中。
```c++ unordered_multimap(std::initializer_list<value_type> il, size_type n, const hasher& hf, const allocator_type& a); ```
```c++ unordered_multimap(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。
```c++ const_iterator cend() const noexcept; ```
```c++ const_iterator cend() const noexcept; ```
Returns:;; A `const_iterator` which refers to the past-the-end value for the container.
返回：指向容器尾后值的 `const_iterator`。
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。
Extract by Iterator
通过迭代器提取
Returns:;; A `node_type` owning the element. Notes:;; A node extracted using this method can be inserted into a compatible `unordered_map`.
返回：一个拥有该元素的 `node_type`。
注意：通过此方法提取的节点可以插入到兼容的 `unordered_map` 中。
Extract by Key
通过键提取
Returns:;; A `node_type` owning the element if found, otherwise an empty `node_type`. Throws:;; Only throws an exception if it is thrown by `hasher` or `key_equal`. Notes:;; A node extracted using this method can be inserted into a compatible `unordered_map`. + + 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：如果找到该元素，则返回一个拥有该元素的 `node_type`；否则返回一个空的 `node_type`。
抛出：仅当 `hasher` 或 `key_equal` 抛出异常时才会抛出。
注意：通过此方法提取的节点可以插入到兼容的 `unordered_map` 中。

`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>
Observers
观察器
```c++ unordered_multimap(); ```
```c++ unordered_multimap(); ```

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Translation uploaded
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.
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。
06/05/2026
User avatar admin

String added in the repository
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.
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.
06/05/2026
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Glossary

English Chinese (Simplified Han script)
No related strings found in the glossary.

String information

Flags
safe-html, strict-same
Unit identifier
51426
Source string location
:543
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 108