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Requires:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
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:1589
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
如果 `Allocator::propagate_on_container_swap` 被声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
Effects:;; `x.swap(y)` Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping.
效果：`x.swap(y)`
抛出：除非 `key_equal` 或 `hasher` 在交换时抛出异常，否则不抛出任何异常。
:1595
---
---
erase_if
erase_if
```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_node_map<K, T, H, P, A>::size_type erase_if(unordered_node_map<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename unordered_node_map<k, t,="" h,="" p,="" a="">::size_type erase_if(unordered_node_map<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Traverses the container `c` and removes all elements for which the supplied predicate returns `true`.
遍历容器 `c`，并移除所有使给定谓词返回 `true` 的元素。
Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ``` + Note that the references passed to `pred` are non-const.
返回：被擦除的元素数量。
注意：等价于：
```c++
auto original_size = c.size();
for (auto i = c.begin(), last = c.end(); i != last; ) {
if (pred(*i)) {
i = c.erase(i);
} else {
++i;
}
}
return original_size - c.size();
```
注意，传递给 `pred` 的引用是非常量的。
Serialization
序列化
``unordered_node_map``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_node_map` 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_node_map to an archive
将 unordered_node_map 保存到归档中
Saves all the elements of an `unordered_node_map` `x` to an archive (XML archive) `ar`.
将 `unordered_node_map` `x` 的所有元素保存到归档（XML 归档） `ar` 。
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>
:1641
---
---
Loading an unordered_node_map from an archive
从归档中加载 unordered_node_map
Deletes all preexisting elements of an `unordered_node_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_node_map` `other` saved to the storage read by `ar`.
删除 `unordered_node_map` 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_node_map` 容器 `other` 保存到 `ar` 所读取存储中的元素恢复出的副本。
Requires:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
要求：`key_type` 和 `mapped_type` 必须分别能够从 `std::remove_const<key_type>::type&amp;&amp;` 和 `std::remove_const<mapped_type>::type&amp;&amp;` 构造。`x.key_equal()` 在功能上必须等价于 `other.key_equal()`。</mapped_type></key_type>
:1655
---
---
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_node_map` `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_node_map` 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。
:1667
---
---
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_node_map` `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_node_map` 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
```c++ explicit unordered_node_map(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
```c++ explicit unordered_node_map(size_type n, const hasher&amp; hf = hasher(), const key_equal&amp; eql = key_equal(), const allocator_type&amp; a = allocator_type()); ```
initializer_list Constructor with Allocator
带分配器的初始化列表构造函数
Move Insert with Hint
带提示的移动插入
Insert Iterator Range
迭代器范围插入
Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; This function is similiar to xref:#unordered_node_map_emplace_hint[emplace_hint], with the difference that no `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++
返回：如果发生了插入，则迭代器指向新插入的元素；否则，指向具有等价键的元素。
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：此函数类似于 xref:#unordered_node_map_emplace_hint[emplace_hint]，区别在于如果存在具有等价键的元素，则不构造 `value_type`；否则，构造形式为：

```c++
As a result of its using open addressing, the interface of `boost::unordered_node_map` deviates in a number of aspects from that of `boost::unordered_map`/`std::unordered_map`:
由于使用开放寻址，`boost::unordered_node_map` 的接口在多个方面与 `boost::unordered_map`/`std::unordered_map` 有所不同：
- `begin()` is not constant-time. - There is no API for bucket handling (except `bucket_count`). - The maximum load factor of the container is managed internally and can't be set by the user.
- `begin()` 不是常数时间复杂度操作。 - 未提供用于桶管理的 API（除 `bucket_count` 外）。 - 容器的最大负载因子由内部管理，用户无法进行设置。
Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the container. Note that this option decreases the overall performance of many operations.
全局定义此宏可为容器启用 xref:reference/stats.adoc#stats[统计计算]。请注意，此选项会降低许多操作的整体性能。
Return `false` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
若 `x.size() == y.size()` 且对于 `x` 中的每个元素，在 `y` 中均存在一个具有相同键且值相等（使用 `operator==` 比较值类型）的元素，则返回 `false`。
Swap
交换
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_node_map<Key, T, Hash, Pred, Alloc>& x, unordered_node_map<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(unordered_node_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, unordered_node_map<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
Swaps the contents of `x` and `y`.
交换 `x` 和 `y` 的内容。
Effects:;; `x.swap(y)` Throws:;; Nothing unless `key_equal` or `hasher` throw on swapping.
效果：`x.swap(y)`
抛出：除非 `key_equal` 或 `hasher` 在交换时抛出异常，否则不抛出任何异常。
erase_if
erase_if
```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_node_map<K, T, H, P, A>::size_type erase_if(unordered_node_map<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename unordered_node_map<k, t,="" h,="" p,="" a="">::size_type erase_if(unordered_node_map<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Traverses the container `c` and removes all elements for which the supplied predicate returns `true`.
遍历容器 `c`，并移除所有使给定谓词返回 `true` 的元素。
Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ``` + Note that the references passed to `pred` are non-const.
返回：被擦除的元素数量。
注意：等价于：
```c++
auto original_size = c.size();
for (auto i = c.begin(), last = c.end(); i != last; ) {
if (pred(*i)) {
i = c.erase(i);
} else {
++i;
}
}
return original_size - c.size();
```
注意，传递给 `pred` 的引用是非常量的。
Serialization
序列化
``unordered_node_map``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_node_map` 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_node_map to an archive
将 unordered_node_map 保存到归档中
Saves all the elements of an `unordered_node_map` `x` to an archive (XML archive) `ar`.
将 `unordered_node_map` `x` 的所有元素保存到归档（XML 归档） `ar` 。
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>
Deletes all preexisting elements of an `unordered_node_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_node_map` `other` saved to the storage read by `ar`.
删除 `unordered_node_map` 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_node_map` 容器 `other` 保存到 `ar` 所读取存储中的元素恢复出的副本。
Requires:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
要求：`key_type` 和 `mapped_type` 必须分别能够从 `std::remove_const<key_type>::type&amp;&amp;` 和 `std::remove_const<mapped_type>::type&amp;&amp;` 构造。`x.key_equal()` 在功能上必须等价于 `other.key_equal()`。</mapped_type></key_type>
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_node_map` `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_node_map` 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。
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_node_map` `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_node_map` 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:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
Requires:;; 要求：`key_type` and和 `mapped_type` are constructible from必须分别能够从 `std::remove_const<key_type>::type&&` andamp;&amp;` 和 `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.amp;&amp;` 构造。`x.key_equal()` 在功能上必须等价于 `other.key_equal()`。</mapped_type></key_type>
06/05/2026
User avatar admin

String added in the repository
Requires:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
Requires:;; `key_type` and `mapped_type` are constructible from `std::remove_const<key_type>::type&&` and `std::remove_const<mapped_type>::type&&`, respectively. `x.key_equal()` is functionally equivalent to `other.key_equal()`.
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
53192
Source string location
:1650
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_node_map_zh_Hans.adoc, string 439