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If there is an existing element with key `k` this function does nothing.
If there is an existing element with key `k` this function does nothing.如果已存在键为 `k` 的元素，则该函数不执行任何操作。
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Inserts a new element into the container if there is no existing element with key `k` contained within it.
Inserts a new element into the container if there is no existing element with key `k` contained within it.如果容器中不存在键为 `k` 的元素，则插入一个新元素。
:972
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```c++ template<class... Args> std::pair<iterator, bool> try_emplace(const key_type& k, Args&&... args); template<class... Args> std::pair<iterator, bool> try_emplace(key_type&& k, Args&&... args); template<class K, class... Args> std::pair<iterator, bool> try_emplace(K&& k, Args&&... args) ```
```c++ template<class... Aargs=""> std::pair<iterator, bool=""> try_emplace(const key_type&amp; k, Args&&amp;&amp;... args); template<class... Aargs=""> std::pair<iterator, bool=""> try_emplace(key_type&& k, Args&&amp;&amp; k, Args&amp;&amp;... args); template<class K,k,="" class... Args="" args=""> std::pair<iterator, bool=""> try_emplace(K&& k, Args&&... args) ```amp;&amp; k, Args&amp;&amp;... args) ```</iterator,></class></iterator,></class...></iterator,></class...>
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try_emplace
try_emplace
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---
---
:960
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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 factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is可以在容器中进行 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 factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.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因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
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Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.将一个范围内的元素插入容器中。当且仅当容器中没有具有等价键的元素时，才会插入这些元素。
:951
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```c++ void insert(std::initializer_list<value_type>); ```
```c++ void insert(std::initializer_list<value_type>); ```</value_type>
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Insert Initializer List
Insert Initializer List初始化列表插入
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---
---
:944
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` 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 factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is必须可以从 `*first` 出发在 `X` 中进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` 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 factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.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因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
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Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.
Inserts a range of elements into the container. Elements are inserted if and only if there is no element in the container with an equivalent key.将一个范围内的元素插入容器中。当且仅当容器中没有具有等价键的元素时，才会插入这些元素。
:935
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```c++ template<class InputIterator> void insert(InputIterator first, InputIterator last); ```
```c++ template<class IinputIiterator=""> void insert(InputIterator first, InputIterator last); ```</class>
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Insert Iterator Range
Insert Iterator Range迭代器范围插入
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---
---
:928
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Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.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。
注意：标准关于 `hint` 的含义表述相当模糊。但唯一实际的使用方式，也是 Boost.Unordered 支持的唯一方式，是将其指向一个具有相同键的已存在元素。
可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。
指向元素的指针和引用永远不会失效。
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`hint` is a suggestion to where the element should be inserted.
`hint` is a suggestion to where the element should be inserted.是关于元素插入位置的建议。
:918
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Only participates in overload resolution if `std::is_constructible<value_type, P&&>::value` is `true`.
Only participates in overload resolution if仅当 `std::is_constructible<value_type, Pp&&="">::value` is为 `true`. 时参与重载决议。</value_type,>
:916
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Inserts an element into the container by performing `emplace_hint(hint, std::forward<P>(value))`.
Inserts an element into the container by performing通过执行 `emplace_hint(hint, std::forward<Pp>(value))`. 向容器中插入一个元素。</p>
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```c++ template<class P> iterator insert(const_iterator hint, P&& obj); ```
```c++ template<class Pp=""> iterator insert(const_iterator hint, P&&amp;&amp; obj); ```</class>
06/05/2026

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