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try_emplace with Hint
try_emplace with Hint带提示的 try++_++emplace
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---
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--
--
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The `template<class K, class\... Args>` 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.
The `template<class K, class\... Args>` overload only participates in overload resolution if k,="" args="">` 重载仅在以下条件下参与重载决议：`Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs and neither是有效的成员 typedef，且 `iterator` nor和 `const_iterator` are implicitly convertible from `K`. The library assumes that `Hash` is callable with both均不能从 `K` 隐式转换。库假定 `Hash` 可同时以 `K` and和 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用，且 `Pred` 是透明的。这实现了异构查找，从而避免实例化 `Key` 类型对象的开销。</class>
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Can invalidate iterators pointers and references, but only if the insert causes the load to be greater than the maximum load.
Can invalidate iterators pointers and references, but only if the insert causes the load to be greater than the maximum load.可能会导致迭代器、指针和引用失效，但仅当插入操作导致负载因子超过最大负载因子时才会发生。
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unlike xref:#unordered_flat_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor.
unlike与 xref:#unordered_flat_map_emplace[emplace], which simply forwards all arguments to ``value_type``'s constructor. 不同，后者只是将所有参数转发给 `value_type` 的构造函数。
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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), std::forward_as_tuple(std::forward<Args>(args)...)) ```
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kk>(k)), std::forward_as_tuple(std::forward<Aargs>(args)...)) ```</args></k>
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value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Key>(k)), std::forward_as_tuple(std::forward<Args>(args)...))
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Kkey>(k)), std::forward_as_tuple(std::forward<Aargs>(args)...))</args></key>
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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:;; This function is similiar to xref:#unordered_flat_map_emplace[emplace], with the difference that no `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++
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:;; This function is similiar to xref:#unordered_flat_map_emplace[emplace], with the difference that no `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: 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：此函数与 xref:#unordered_flat_map_emplace[emplace] 类似，区别在于：若存在等价的键，则不构造 `value_type`；否则，构造形式如下：+ + -- ```c++`
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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.若容器中不存在键为 `k` 的元素，则插入一个新元素。
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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，则向容器中插入一个新元素。
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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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---
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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, pointers and references, but only if the insert causes the load to be greater than the maximum load.
Requires:;; 要求：`value_type` is需满足对容器而言的 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, pointers and references, but only if the insert causes the load to be greater than the maximum load.可复制插入^] 要求。抛出：当插入单个元素时，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。
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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.将范围内的元素插入容器中。当且仅当容器中没有等价的键时，才会插入元素。
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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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---
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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, pointers and references, but only if the insert causes the load to be greater than the maximum load.
Requires:;; 要求：`value_type` is需从 `*first` 处满足对容器的 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, pointers and references, but only if the insert causes the load to be greater than the maximum load.可原位构造^] 要求。抛出：当插入单个元素时，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。
06/05/2026

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