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Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
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等价的键时，将 `obj` 插入容器。
:815
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```c++ std::pair<iterator, bool> insert(value_type&& obj); std::pair<iterator, bool> insert(init_type&& obj); ```
```c++ std::pair<iterator, bool=""> insert(value_type&&amp;&amp; obj); std::pair<iterator, bool=""> insert(init_type&&amp;&amp; obj); ```</iterator,></iterator,>
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Move Insert
Move Insert移动插入
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:807
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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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + A call of the form `insert(x)`, where `x` is equally convertible to both `const value_type&` and `const init_type&`, is not ambiguous and selects the `init_type` overload.
Requires:;; 要求：`value_type` is需满足 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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + A call of the form `insert(x)`, where `x` is equally convertible to both可复制插入^] 要求。返回：若执行了插入，则返回类型中的 `bool` 分量为 `true`。+ +若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。注意：可能使迭代器、指针和引用失效，但仅当插入导致负载大于最大负载时才会发生。+ +形式为 `insert(x)` 的调用（其中 `x` 可同等转换为 `const value_type&` andamp;` 和 `const init_type&`, is not ambiguous and selects theamp;`）不会产生歧义，并且会选择 `init_type` overload.重载。
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Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
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等价的键时，将 `obj` 插入容器。
:795
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```c++ std::pair<iterator, bool> insert(const value_type& obj); std::pair<iterator, bool> insert(const init_type& obj); ```
```c++ std::pair<iterator, bool=""> insert(const value_type&amp; obj); std::pair<iterator, bool=""> insert(const init_type&amp; obj); ```</iterator,></iterator,>
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Copy Insert
Copy Insert复制插入
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:787
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Requires:;; `value_type` is constructible from `args`. 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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.
Requires:;; 要求：`value_type` is constructible from `args`. 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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.可从 `args` 构造。返回：若执行了插入，则返回类型中的 `bool` 分量为 `true`。+ +若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。注意：可能使迭代器、指针和引用失效，但仅当插入导致负载大于最大负载时才会发生。+ +若 `args...` 的形式为 `k,v`，则仅在确定应插入元素时才构造整个对象，检查时仅使用 `k` 参数。
:778
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`position` is a suggestion to where the element should be inserted. This implementation ignores it.
`position` is a suggestion to where the element should be inserted. This implementation ignores it.是一个关于元素应插入位置的建议。此实现会忽略该建议。
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Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent key.
Inserts an object, constructed with the arguments `args`, 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等价的键时，插入一个使用参数 `args` 构造的对象。
:773
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```c++ template<class... Args> iterator emplace_hint(const_iterator position, Args&&... args); ```
```c++ template<class... Aargs=""> iterator emplace_hint(const_iterator position, Args&&amp;&amp;... args); ```</class...>
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emplace_hint
emplace_++_++hint
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---
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:766
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Requires:;; `value_type` is constructible from `args`. 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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.
Requires:;; 要求：`value_type` is constructible from `args`. 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, pointers and references, but only if the insert causes the load to be greater than the maximum load. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.可从 `args` 构造。返回：若执行了插入，则返回类型中的 `bool` 分量为 `true`。+ +若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。注意：可能使迭代器、指针和引用失效，但仅当插入导致负载大于最大负载时才会发生。+ +若 `args...` 的形式为 `k,v`，则仅在确定应插入元素时才构造整个对象，检查时仅使用 `k` 参数。
:757
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Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent key.
Inserts an object, constructed with the arguments `args`, 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等价的键时，插入一个使用参数 `args` 构造的对象。
:754
06/05/2026
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```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```
```c++ template<class... Aargs=""> std::pair<iterator, bool=""> emplace(Args&&amp;&amp;... args); ```</iterator,></class...>
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emplace
emplace原地构造
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Modifiers
Modifiers修改器
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