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Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
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``unordered_multimap``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.
`unordered_multimap` 可以通过本库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization^] 进行归档/恢复。支持常规归档和 XML 归档。
Saving an unordered_multimap to an archive
将 unordered_multimap 保存到归档
Saves all the elements of an `unordered_multimap` `x` to an archive (XML archive) `ar`.
将 `unordered_multimap` 容器 `x` 的所有元素保存到归档（XML 归档） `ar` 中。
Requires:;; `std::remove_const<key_type>::type` and `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types).
要求：`std::remove_const<key_type>::type` 和 `std::remove_const<mapped_type>::type` 必须是可序列化的（对于 XML 归档需支持 XML 序列化），并且它们必须支持 Boost.Serialization 的 `save_construct_data`/`load_construct_data` 协议（该协议由满足 https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 的类型自动支持）。</mapped_type></key_type>
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Loading an unordered_multimap from an archive
从归档加载 unordered_multimap
Deletes all preexisting elements of an `unordered_multimap` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_multimap` `other` saved to the storage read by `ar`.
删除 `unordered_multimap` 容器 `x` 中所有已存在的元素，并从归档（XML 归档）`ar` 中插入从原始 `unordered_multimap` 容器 `other` 保存到 `ar` 所读取存储中的元素恢复出的副本。
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `(std::remove_const<key_type>::type&&, std::remove_const<mapped_type>::type&&)`. `x.key_equal()` is functionally equivalent to `other.key_equal()`. Note:;; If the archive was saved using a release of Boost prior to Boost 1.84, the configuration macro `BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0` has to be globally defined for this operation to succeed; otherwise, an exception is thrown.
要求：`value_type` 必须可以从 `(std::remove_const<key_type>::type&amp;&amp;, std::remove_const<mapped_type>::type&amp;&amp;)` 进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^]。`x.key_equal()` 在功能上必须等价于 `other.key_equal()`。
注意：如果归档是使用 Boost 1.84 之前版本的 Boost 保存的，则必须全局定义配置宏 `BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0` 才能使此操作成功；否则，将抛出异常。</mapped_type></key_type>
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Saving an iterator/const_iterator to an archive
将迭代器/常量迭代器保存到归档
Saves the positional information of an `iterator` (`const_iterator`) `it` to an archive (XML archive) `ar`. `it` can be and `end()` iterator.
将迭代器（或常量迭代器）`it` 的位置信息保存到归档（XML 归档）`ar` 中。`it` 可以是一个 `end()` 迭代器。
Requires:;; The `unordered_multimap` `x` pointed to by `it` has been previously saved to `ar`, and no modifying operations have been issued on `x` between saving of `x` and saving of `it`.
要求：`it` 所指向的 `unordered_multimap` 容器 `x` 必须先被保存到 `ar` 中，并且在保存 `x` 和保存 `it` 之间，不能对 `x` 执行任何修改操作。
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Loading an iterator/const_iterator from an archive
从归档加载迭代器/常量迭代器
Makes an `iterator` (`const_iterator`) `it` point to the restored position of the original `iterator` (`const_iterator`) saved to the storage read by an archive (XML archive) `ar`.
使迭代器（或常量迭代器）`it` 指向原始迭代器（或常量迭代器）被保存到归档（XML 归档）`ar` 所读取存储中的位置恢复后的位置。
Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
要求：如果 `x` 是 `it` 所指向的 `unordered_multimap` 容器，则在加载 `x` 和加载 `it` 之间，不能对 `x` 执行任何修改操作。
English Chinese (Simplified Han script) Actions
__iter-value-type__
_iter-value-type_
__iter-key-type__
__iter-key-type__
operator
运算符
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator==(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x, const unordered_multimap<Key, T, Hash, Pred, Alloc>& y); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator==(const unordered_multimap<key, t,="" hash,="" pred,="" alloc="">&amp; x, const unordered_multimap<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_multimap<Key, T, Hash, Pred, Alloc>& x, unordered_multimap<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(unordered_multimap<key, t,="" hash,="" pred,="" alloc="">&amp; x, unordered_multimap<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
erase_if
erase_if
`boost::unordered_multimap` — An unordered associative container that associates keys with another value. The same key can be stored multiple times.
`boost::unordered_multimap` — 一个无序关联容器，将键与对应值相关联。同一个键可以多次存储。
Description
描述
*Template Parameters*
*模板参数*
`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）。
_T_
_T_
`T` must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container (i.e. `allocator_traits` can destroy it).
`T` 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）。
_Hash_
_Hash_
A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数，并返回一个 `std::size_t` 类型的值。
Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
要求：如果 `x` 是 `it` 所指向的 `unordered_multimap` 容器，则在加载 `x` 和加载 `it` 之间，不能对 `x` 执行任何修改操作。

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Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.要求：如果 `x` 是 `it` 所指向的 `unordered_multimap` 容器，则在加载 `x` 和加载 `it` 之间，不能对 `x` 执行任何修改操作。
06/05/2026
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String added in the repository
Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
Requires:;; If `x` is the `unordered_multimap` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
06/05/2026
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English Chinese (Simplified Han script)
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String information

Flags
safe-html, strict-same
Unit identifier
51752
Source string location
:1546
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 434