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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。
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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... Args> args="">
std::pair<iterator, bool=""> try_emplace(const key_type&amp; k, Args&&amp;&amp;... args);
template<class... Args> args="">
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&&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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Returns:;; The iterator returned is `end()` if `nh` is empty. If insertion 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:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.
Returns:;; The iterator returned is `end()` if `nh` is empty. If insertion 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:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.返回：如果 `nh` 为空，则返回的迭代器为 `end()`。如果插入发生，则迭代器指向新插入的元素；否则，指向具有等价键的元素。
抛出：如果除调用 `hasher` 之外的操作抛出异常，则该函数无效果。
注意：如果 `nh` 非空且 `nh` 与容器的分配器不相等，则行为未定义。
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`hint` is a suggestion to where the element should be inserted. This implementation ignores it.
`hint` is a suggestion to where the element should be inserted. This implementation ignores it.是关于元素插入位置的建议。此实现会忽略该建议。
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If `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.key()`. `nh` becomes empty if insertion took place, otherwise it is not changed.
If如果 `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.key()`. `nh` becomes empty if insertion took place, otherwise it is not changed.非空，则当且仅当容器中没有键与 `nh.key()` 等价的元素时，才将关联的元素插入容器。如果插入发生，则 `nh` 变为空；否则 `nh` 不变。
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```c++ iterator insert(const_iterator hint, node_type&& nh); ```
```c++ iterator insert(const_iterator hint, node_type&&amp;&amp; nh); ```
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Insert Node with Hint
Insert Node with Hint带提示的节点插入
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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. 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. 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键等价于 `nh.key()` 的元素时，插入其关联元素。函数返回时 `nh` 为空。
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If the insertion failed, `inserted` is false, `node` has the previous value of `nh`, and `position` points to an element with a key equivalent to `nh.key()`.
If the insertion failed,若插入操作失败，则 `inserted` is 为 `false,` ， `node` has the previous value of `nh`, and `position` points to an element with a key equivalent to保留 `nh` 的原始值，且 `position` 指向与 `nh.key()`. 等效的元素。
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Otherwise if the insertion took place, `inserted` is true, `position` points to the inserted element, and `node` is empty.
Otherwise if the insertion took place,否则，若插入操作发生，则 `inserted` is 为 `true,` ， `position` points to the inserted element, and `node` is empty.指向被插入的元素，且 `node` 为空。
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If `nh` is empty, `inserted` is `false`, `position` is `end()`, and `node` is empty.
If若 `nh` is empty,为空，则 `inserted` is为 `false`, ， `position` is为 `end()`, and ，且 `node` is empty.为空。
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Returns:;; An `insert_return_type` object constructed from `position`, `inserted` and `node`: +
Returns:;; An返回：一个 `insert_return_type` object constructed from对象，由 `position`, 、`inserted` and和 `node`: + 构造而成。
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If `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.key()`. `nh` is empty when the function returns.
If如果 `nh` is not empty, inserts the associated element in the container if and only if there is no element in the container with a key equivalent to `nh.key()`. `nh` is empty when the function returns.非空，则当且仅当容器中没有键与 `nh.key()` 等价的元素时，才将关联的元素插入容器。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); ```
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Insert Node
Insert Node节点插入
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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 to be greater than the maximum load.
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 to be greater than the maximum load.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大于最大负载时才会发生。
06/05/2026

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