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```c++ template<class F> bool insert_or_visit(value_type&& obj, F f); template<class F> bool insert_or_cvisit(value_type&& obj, F f); ```
```c++ template<class Ff=""> bool insert_or_visit(value_type&&amp;&amp; obj, F f); template<class Ff=""> bool insert_or_cvisit(value_type&&amp;&amp; obj, F f); ```</class></class>
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Move insert_or_[c]visit
Move移动 insert_or_[c]++_++or++_[++c++]++visit
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`.
Requires:要求：;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`.支持拷贝插入。
返回值：;; 若成功插入元素则返回 `true`。
并发特性：;; 会阻塞当前对象 `*this` 的扩容重哈希操作。
:1074
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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key. Otherwise, invokes `f` with a const reference to the equivalent element.
Inserts `obj` in the table if and only if there is no element in the table with an equivalent key. Otherwise, invokes `f` with a const reference to the equivalent element.当且仅当哈希表中不存在键等价的元素时，将 `obj` 插入表中；否则，以该等价元素的常量引用为参数调用函数 `f`。
:1070
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```c++ template<class F> bool insert_or_visit(const value_type& obj, F f); template<class F> bool insert_or_cvisit(const value_type& obj, F f); ```
```c++ template<class Ff=""> bool insert_or_visit(const value_type&amp; obj, F f); template<class Ff=""> bool insert_or_cvisit(const value_type&amp; obj, F f); ```</class></class>
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Copy insert_or_[c]visit
Copy复制 insert_or_[c]++_++or++_[++c++]++visit
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:1062
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Requires:;; `value_type` is constructible from `args`. Returns:;; `true` if an insert took place. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; The interface is exposition only, as C++ does not allow to declare a parameter `f` after a variadic parameter pack.
Requires:要求：;; `value_type` is constructible from `args`. Returns:;; `true` if an insert took place. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; The interface is exposition only, as C++ does not allow to declare a parameter `f` after a variadic parameter pack.可由 `args` 构造。
返回值：;; 若成功插入元素则返回 `true`。
并发特性：;; 会阻塞当前对象 `*this` 的扩容重哈希操作。
注意：;; 该接口仅为说明性用法，因为 C++ 不允许在可变参数包之后声明参数 `f`。
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Inserts an object, constructed with the arguments `args`, in the table if there is no element in the table with an equivalent key. Otherwise, invokes `f` with a const reference to the equivalent element.
Inserts an object, constructed with the arguments `args`, in the table if there is no element in the table with an equivalent key. Otherwise, invokes `f` with a const reference to the equivalent element.若哈希表中不存在键等价的元素，则使用参数 `args` 构造对象并插入表中；否则，以该等价元素的常量引用为参数调用函数 `f`。
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```c++ template<class... Args, class F> bool emplace_or_visit(Args&&... args, F&& f); template<class... Args, class F> bool emplace_or_cvisit(Args&&... args, F&& f); ```
```c++ template<class... Aargs,="" class F="" f=""> bool emplace_or_visit(Args&&amp;&amp;... args, F&&amp;&amp; f); template<class... Aargs,="" class F="" f=""> bool emplace_or_cvisit(Args&&amp;&amp;... args, F&& f); ```amp;&amp; f); ```</class...></class...>
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emplace_or_[c]visit
emplace_or_[c]visit
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---
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Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.
Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.若 `nh` 非空，则当且仅当容器中不存在与 `nh.value()` 等效的键时，插入其关联的元素。函数返回时 `nh` 为空。
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If the insertion failed, `inserted` is false and `node` has the previous value of `nh`.
If the insertion failed,若插入操作失败，则 `inserted` is为 false and，且 `node` has the previous value of `nh`.保留 `nh` 的原值。
:1040
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Otherwise if the insertion took place, `inserted` is true and `node` is empty.
Otherwise if the insertion took place,若插入操作成功，则 `inserted` is为 true and， 且 `node` is empty.为空。
:1039
06/05/2026
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If `nh` is empty, `inserted` is `false` and `node` is empty.
If若 `nh` is empty,为空，则 `inserted` is为 `false` and且 `node` is empty.为空。
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Returns:;; An `insert_return_type` object constructed from `inserted` and `node`: +
Returns:;; An返回值：;; 由 `insert_return_type` object constructed from `inserted` and `node`: +ed` 和 `node` 构造的 `insert_return_type` 对象。
:1037
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If `nh` is not empty, inserts the associated element in the table if and only if there is no element in the table with a key equivalent to `nh.value()`. `nh` is empty when the function returns.
If若 `nh` is not empty, inserts the associated element in the table if and only if there is no element in the table with a key equivalent to `nh.value()`. `nh` is empty when the function returns.非空，则当且仅当哈希表中不存在与 `nh.value()` 键等价的元素时，将其关联元素插入哈希表。函数返回时 `nh` 变为空。
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```c++ insert_return_type insert(node_type&& nh); ```
```c++ insert_return_type insert(node_type&&amp;&amp; nh); ```
06/05/2026

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