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Pointers and references to elements are never invalidated.
Pointers and references to elements are never invalidated.指向元素的指针和引用永远不会失效。
:1047
06/05/2026
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Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor.
Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor.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。
:1045
06/05/2026
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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.
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.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。
06/05/2026
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instead of xref:#unordered_map_emplace_hint[emplace_hint] which simply forwards all arguments to ``value_type``'s constructor.
instead of而不是像 xref:#unordered_map_emplace_hint[emplace_hint] which simply forwards all arguments to ``value_type``'s constructor.那样简单地将所有参数转发给 `value_type` 的构造函数。
06/05/2026
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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>
:1036
06/05/2026
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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>
:1031
06/05/2026
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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. 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_map_emplace_hint[emplace_hint] except the `value_type` is constructed using: + + -- ```c++
Returns:;; 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。 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：此函数类似于 xref:#unordered_map_emplace_hint[emplace_hint] except the，区别在于 `value_type` is constructed using: + + -- 的构造方式如下：
```c++
06/05/2026
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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。
:1021
06/05/2026
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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。
:1019
06/05/2026
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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。
:1017
06/05/2026
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```c++ template<class... Args> iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); template<class... Args> iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args); template<class K, class... Args> iterator try_emplace(const_iterator hint, K&& k, Args&&... args); ```
```c++ template<class... Aargs=""> iterator try_emplace(const_iterator hint, const key_type&amp; k, Args&&amp;&amp;... args); template<class... Aargs=""> iterator try_emplace(const_iterator hint, key_type&& k, Args&&amp;&amp; k, Args&amp;&amp;... args); template<class K,k,="" class... Args="" args=""> iterator try_emplace(const_iterator hint, K&& k, Args&&... args); ```amp;&amp; k, Args&amp;&amp;... args); ```</class></class...></class...>
06/05/2026
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try_emplace with Hint
带提示位置的 `try_emplace with Hint`
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---
---
:1005
06/05/2026
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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 ifk,="" args="">` 重载仅在 `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都不能从 `K` 隐式转换时参与重载决议。库假定 `Hash` 可同时使用 `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。这支持了异构查找，从而避免了实例化 `Key` 类型对象的开销。</class>
:1002
06/05/2026
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Pointers and references to elements are never invalidated.
Pointers and references to elements are never invalidated.指向元素的指针和引用永远不会失效。
:1000
06/05/2026
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Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor.
Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor.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。
:998
06/05/2026
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instead of xref:#unordered_map_emplace[emplace] which simply forwards all arguments to ``value_type``'s constructor.
instead of而不是像 xref:#unordered_map_emplace[emplace] which simply forwards all arguments to ``value_type``'s constructor.那样简单地将所有参数转发给 `value_type` 的构造函数。
06/05/2026
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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>
:991
06/05/2026
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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>
:986
06/05/2026
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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_map_emplace[emplace] except the `value_type` is constructed using: + + -- ```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返回：返回类型的 bool 分量为 true 表示发生了插入。
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。
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：此函数类似于 xref:#unordered_map_emplace[emplace] except the，区别在于 `value_type` is constructed using: + + --的构造方式如下： ```c++
06/05/2026

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