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```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
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```c++ std::pair<iterator, bool> insert(const value_type& obj); ```
```c++ std::pair<iterator, bool=""> insert(const value_type&amp; obj); ```</iterator,>
:777
Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
:780
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
要求：`value_type` 满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可拷贝插入^]。
返回：返回类型的 `bool` 分量为 `true` 表示发生了插入。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。
:787
---
---
Move Insert
移动插入
```c++ std::pair<iterator, bool> insert(value_type&& obj); ```
```c++ std::pair<iterator, bool=""> insert(value_type&amp;&amp; obj); ```</iterator,>
:794
Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
:797
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
要求：`value_type` 满足 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[可移动插入^]。
返回：返回类型的 `bool` 分量为 `true` 表示发生了插入。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。
:804
---
---
Transparent Insert
透明插入
```c++ template<class K> std::pair<iterator, bool> insert(K&& k); ```
```c++ template<class k=""> std::pair<iterator, bool=""> insert(K&amp;&amp; k); ```</iterator,></class>
:811
Inserts an element constructed from `std::forward<K>(k)` in the container if and only if there is no element in the container with an equivalent key.
当且仅当容器中没有具有等价键的元素时，才将在容器中插入一个从 `std::forward<k>(k)` 构造的元素。</k>
:814
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `k`. Returns:;; The bool component of the return type is true if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load. + + This 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.
要求：`value_type` 可以从 `k` 进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^]。
返回：如果发生了插入，则返回类型的 bool 分量为 true。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。

只有当 `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，此重载才会参与重载决议。库假定 `Hash` 可同时用 `K` 和 `Key` 调用，并且 `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。
:823
---
---
Copy Insert with Hint
带提示的复制插入
```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
```c++ iterator insert(const_iterator hint, const value_type&amp; obj); ```当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
:831
`hint` is a suggestion to where the element should be inserted. This implementation ignores it.
`hint` 是关于元素插入位置的建议。此实现会忽略该建议。
:834
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
要求：`value_type` 满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[可拷贝插入^]。
返回：返回类型的 `bool` 分量为 `true` 表示发生了插入。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。
:841
---
---
Move Insert with Hint
带提示的移动插入
```c++ iterator insert(const_iterator hint, value_type&& obj); ```
```c++ iterator insert(const_iterator hint, value_type&amp;&amp; obj); ```
:848
Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
:850
`hint` is a suggestion to where the element should be inserted. This implementation ignores it.
`hint` 是关于元素插入位置的建议。此实现会忽略该建议。
:853
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; The `bool` component of the return type is `true` if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load.
要求：`value_type` 满足 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[可移动插入^]。
返回：返回类型的 `bool` 分量为 `true` 表示发生了插入。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。
:860
---
---
Transparent Insert with Hint
带提示的透明插入
```c++ template<class K> std::pair<iterator, bool> insert(const_iterator hint, K&& k); ```
```c++ template<class k=""> std::pair<iterator, bool=""> insert(const_iterator hint, K&amp;&amp; k); ```</iterator,></class>
:867
Inserts an element constructed from `std::forward<K>(k)` in the container if and only if there is no element in the container with an equivalent key.
当且仅当容器中没有具有等价键的元素时，才在容器中插入一个从 `std::forward<k>(k)` 构造的元素。</k>
:869
`hint` is a suggestion to where the element should be inserted. This implementation ignores it.
`hint` 是关于元素插入位置的建议。此实现会忽略该建议。
:872
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `k`. Returns:;; The bool component of the return type is true if an insert took place. + + 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:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load. + + This 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.
要求：`value_type` 可以从 `k` 进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[可原位构造^]。
返回：如果发生了插入，则返回类型的 bool 分量为 true。
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：可能使迭代器失效，但仅当插入导致负载大于最大负载时才会发生。

只有当 `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，此重载才会参与重载决议。库假定 `Hash` 可同时用 `K` 和 `Key` 调用，并且 `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。
:881
---
---
English Chinese (Simplified Han script) Actions
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 to be greater than the maximum load.
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大于最大负载时才会发生。
If `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.value()`. `nh` is empty when the function returns.
如果 `nh` 非空，则当且仅当容器中没有键与 `nh.value()` 等价的元素时，才将关联的元素插入容器。函数返回时 `nh` 变为空。
Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.
如果 `nh` 非空，则当且仅当容器中不存在键等价于 `nh.value()` 的元素时，插入其关联的元素。函数返回时， `nh` 为空。
If `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.value()`. `nh` becomes empty if insertion took place, otherwise it is not changed.
如果 `nh` 非空，则当且仅当容器中没有键与 `nh.value()` 等价的元素时，才将关联的元素插入容器。如果插入发生，则 `nh` 变为空；否则 `nh` 不变。
Erase the element pointed to by `position`.
擦除由 `position` 指向的元素。
Erase Range
范围擦除
Erases the elements in the range from `first` to `last`.
擦除从 `first` 到 `last` 范围内的元素。
swap
交换
Extracts the element pointed to by `position`.
提取 `position` 所指向的元素。
Extracts the element with key equivalent to `k`, if it exists.
提取键与 `k` 等价的元素（如果存在）。
pull
pull
```c++ init_type pull(const_iterator position); ```
```c++ init_type pull(const_iterator position); ```
Returns:;; A range containing all elements with key equivalent to `k`. If the container doesn't contain any such elements, returns `std::make_pair(b.end(), b.end())`. Notes:;; The `template<class K>` overloads only participate in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. 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：包含所有键与 `k` 等价的元素的范围。如果容器不包含任何此类元素，则返回 `std::make_pair(b.end(), b.end())`。
注意：`template<class k="">` 重载仅在 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员 typedef 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>
- It has an `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.
- 它具有一个 `InputIterator` 模板参数，并且为该参数推导出的类型不符合输入迭代器的要求。
- 它具有一个 `Allocator` 模板参数，并且为该参数推导出的类型不符合分配器的要求。
- 它具有一个 `Hash` 模板参数，并且为该参数推导出的类型是整数类型或符合分配器的要求。
- 它具有一个 `Pred` 模板参数，并且为该参数推导出的类型符合分配器的要求。
Equality Comparisons
相等性比较
```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
```c++ iterator insert(const_iterator hint, const value_type&amp; obj); ```当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
```c++ std::pair<iterator, bool> insert(const value_type& obj); ```
```c++ std::pair<iterator, bool=""> insert(const value_type&amp; obj); ```</iterator,>
```c++ insert_return_type insert(node_type&& nh); ```
```c++ insert_return_type insert(node_type&amp;&amp; nh); ```
```c++ std::pair<iterator, bool> insert(value_type&& obj); ```
```c++ std::pair<iterator, bool=""> insert(value_type&amp;&amp; obj); ```</iterator,>
```c++ template<class K> std::pair<iterator, bool> insert(K&& k); ```
```c++ template<class k=""> std::pair<iterator, bool=""> insert(K&amp;&amp; k); ```</iterator,></class>
Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container 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 to be greater than the maximum load.
要求：`value_type` 可以从 `*first` 出发在容器中进行 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大于最大负载时才会发生。
Copy Insert with Hint
带提示的复制插入
Insert Node
节点插入
If `nh` is empty, `inserted` is `false`, `position` is `end()`, and `node` is empty.
若 `nh` 为空，则 `inserted` 为 `false` ， `position` 为 `end()` ，且 `node` 为空。
Otherwise if the insertion took place, `inserted` is true, `position` points to the inserted element, and `node` is empty.
否则，若插入操作发生，则 `inserted` 为 `true` ， `position` 指向被插入的元素，且 `node` 为空。
If the insertion failed, `inserted` is false, `node` has the previous value of `nh`, and `position` points to an element with a key equivalent to `nh.value()`.
若插入操作失败，则 `inserted` 为 `false` ， `node` 保留 `nh` 的原始值，且 `position` 指向一个键等价于 `nh.value()` 的元素。
Insert Node with Hint
带提示的节点插入
```c++ iterator insert(const_iterator hint, node_type&& nh); ```
```c++ iterator insert(const_iterator hint, node_type&amp;&amp; nh); ```
Returns:;; The iterator returned is `end()` if `nh` is empty. If insertion 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:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.
返回：如果 `nh` 为空，则返回的迭代器为 `end()`。如果插入发生，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：如果 `nh` 非空且 `nh` 与容器的分配器不相等，则行为未定义。
Erase by Position
通过位置擦除

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Translation uploaded
```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
```c++ iterator insert(const_iterator hint, const value_type&amp; obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.当且仅当容器中没有具有等价键的元素时，才将 `obj` 插入容器。
06/05/2026
User avatar admin

String added in the repository
```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
```c++ iterator insert(const_iterator hint, const value_type& obj); ``` Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
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
52545
Source string location
:826
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_set_zh_Hans.adoc, string 201