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```c++ template<class InputIterator, class F1, class F2> size_type insert_or_visit(InputIterator first, InputIterator last, F1 f1, F2 f2); template<class InputIterator, class F1, class F2> size_type insert_or_cvisit(InputIterator first, InputIterator last, F1 f2, F2 f2); ```
```c++ template<class IinputIiterator,="" class F1, class F2="" f1,="" f2=""> size_type insert_or_visit(InputIterator first, InputIterator last, F1 f1, F2 f2); template<class IinputIiterator,="" class F1, class F2="" f1,="" f2=""> size_type insert_or_cvisit(InputIterator first, InputIterator last, F1 f2, F2 f2); ```</class></class>
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Insert Iterator Range and Visit
Insert Iterator Range and Visit迭代器范围插入并访问
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---
---
:1272
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `value_type&&` argument participate in overload resolution only if `std::remove_reference<decltype(obj)>::type` is `value_type`.
Requires:要求：;; `value_type` is满足 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `value_type&&` argument participate in overload resolution only if 要求。
返回值：;; 若执行插入操作则返回 `true`。
并发特性：;; 阻塞对 `*this` 的重哈希操作。
注意：;; 在形式为 `insert_and_[c]visit(obj, f1, f2)` 的调用中，仅当 `std::remove_reference<decltype(obj)>::type` is为 `value_type`. 时，接受 `value_type&amp;&amp;` 参数的重载版本才会参与重载决议。</decltype(obj)>
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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.
Inserts `obj` in the table if and only if there is no element in the table with an equivalent key, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.当且仅当哈希表中不存在等价键的元素时，将`obj`插入表中，随后以非常量引用指向新创建的元素并调用`f1`。否则，以指向等价元素的引用调用`f2`；当且仅当使用`*_cvisit`重载版本时，该引用为常量引用。
:1261
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```c++ template<class F1, class F2> bool insert_and_visit(value_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(value_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_visit(init_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(init_type&& obj, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(value_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(value_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(init_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(init_type&&amp;&amp; obj, F1 f1, F2 f2); ```</class></class></class></class>
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Move insert_and_[c]visit
Move移动 insert_and_[c]++_++and++_[++c++]++visit
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---
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:1251
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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`. Notes:;; In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `const value_type&` argument participate in overload resolution only if `std::remove_cv<std::remove_reference<decltype(obj)>::type>::type` is `value_type`.
Requires:要求：;; `value_type` is满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `const value_type&` argument participate in overload resolution only if 要求。
返回值：;; 若执行插入操作则返回 `true`。
并发特性：;; 阻塞对 `*this` 的重哈希操作。
注意：;; 在形式为 `insert_and_[c]visit(obj, f1, f2)` 的调用中，仅当 `std::remove_cv<std::remove_reference<decltype(obj)>::type>&gt;::type` is `value_type`.为 `value_type` 时，接受 `const value_type&amp;` 参数的重载版本才会参与重载决议。</std::remove_reference<decltype(obj)>
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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.
Inserts `obj` in the table if and only if there is no element in the table with an equivalent key, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.当且仅当哈希表中不存在等价键的元素时，将`obj`插入表中，随后以非常量引用指向新创建的元素并调用`f1`。否则，以指向等价元素的引用调用`f2`；当且仅当使用`*_cvisit`重载版本时，该引用为常量引用。
:1240
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```c++ template<class F1, class F2> bool insert_and_visit(const value_type& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(const value_type& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_visit(const init_type& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(const init_type& obj, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(const value_type&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(const value_type&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(const init_type&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(const init_type&amp; obj, F1 f1, F2 f2); ```</class></class></class></class>
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Copy insert_and_[c]visit
Copy复制 insert_and_[c]++_++and++_[++c++]++visit
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---
---
:1230
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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 parameters `f1` and `f2` 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 parameters可由 `args` 构造。
返回值：;; 若执行插入操作则返回 `true`。
并发特性：;; 阻塞对 `*this` 的重哈希操作。
注意：;; 该接口仅作说明用途，因为 C++ 不允许在可变参数包之后声明参数 `f1` and和 `f2` after a variadic parameter pack.。
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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, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff `emplace_and_cvisit` is used.
Inserts an object, constructed with the arguments `args`, in the table if there is no element in the table with an equivalent key, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff 若表中无等价键元素，则使用参数`args`构造对象并插入表中，随后以非常量引用指向新创建的元素并调用`f1`。否则，以指向等价元素的引用调用`f2`；当且仅当使用`emplace_and_cvisit` is used.时，该引用为常量引用。
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```c++ template<class... Args, class F1, class F2> bool emplace_and_visit(Args&&... args, F1&& f1, F2&& f2); template<class... Args, class F1, class F2> bool emplace_and_cvisit(Args&&... args, F1&& f1, F2&& f2); ```
```c++ template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool emplace_and_visit(Args&&amp;&amp;... args, F1&& f1, F2&&amp;&amp; f1, F2&amp;&amp; f2); template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool emplace_and_cvisit(Args&&amp;&amp;... args, F1&& f1, F2&& f2); ```amp;&amp; f1, F2&amp;&amp; f2); ```</class...></class...>
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emplace_and_[c]visit
emplace_and_[c]visit
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---
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:1210
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Throws:;; If an exception is thrown by an operation other than a call to `hasher` or call to `f`, 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` or call to `f`, 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` 为空，则不执行任何操作。否则，当且仅当容器中不存在键等价于 `nh.key()` 的元素时，插入其关联的元素；否则，以等价元素的引用为参数调用 `f` ；当且仅当使用 `insert++_++or++_++cvisit` 时该引用为常量引用。
06/05/2026
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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。
:1205
06/05/2026

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