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Invalidates pointers and references to elements if a rehashing is issued.
Invalidates pointers and references to elements if a rehashing is issued.若执行重哈希操作，将使指向元素的指针和引用失效。
:1363
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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>
:1358
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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>
:1353
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Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; No `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++
Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; No `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++返回值：插入成功则返回true。
并发：对当前对象*this进行重哈希时阻塞。
说明：若存在等价键的元素，则不会构造value_type；否则，构造形式为：
:1345
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Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.
Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.若容器中不存在键为`k`的元素，则将由`k`和`args`构造的元素插入容器，随后以新创建元素的非常量引用调用`f1`；
否则，以等价元素的引用调用`f2`；若使用`*_cvisit`重载版本，则该引用为常量引用。
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```c++ template<class... Args, class F1, class F2> bool try_emplace_and_visit(const key_type& k, Args&&... args, F1&& f1, F2&& f2); template<class... Args, class F1, class F2> bool try_emplace_and_cvisit(const key_type& k, Args&&... args, F1&& f1, F2&& f2); template<class... Args, class F1, class F2> bool try_emplace_and_visit(key_type&& k, Args&&... args, F1&& f1, F2&& f2); template<class... Args, class F1, class F2> bool try_emplace_and_cvisit(key_type&& k, Args&&... args, F1&& f1, F2&& f2); template<class K, class... Args, class F1, class F2> bool try_emplace_and_visit(K&& k, Args&&... args, F1&& f1, F2&& f2); template<class K, class... Args, class F1, class F2> bool try_emplace_and_cvisit(K&& k, Args&&... args, F1&& f1, F2&& f2); ```
```c++ template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_visit(const key_type&amp; k, Args&&amp;&amp;... args, F1&& f1, F2&&amp;&amp; f1, F2&amp;&amp; f2); template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_cvisit(const key_type&amp; k, Args&&amp;&amp;... args, F1&& f1, F2&&amp;&amp; f1, F2&amp;&amp; f2); template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_visit(key_type&& k, Args&&... args, F1&& f1, F2&&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class... Aargs,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_cvisit(key_type&& k, Args&&... args, F1&& f1, F2&&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class K,k,="" class... A="" args,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_visit(K&& k, Args&&... args, F1&& f1, F2&&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class K,k,="" class... A="" args,="" class F1, class F2="" f1,="" f2=""> bool try_emplace_and_cvisit(K&& k, Args&&... args, F1&& f1, F2&& f2); ```amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); ```</class></class></class...></class...></class...></class...>
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try_emplace_and_[c]visit
try_emplace_and_[c]visit
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---
---
:1322
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--
--
:1320
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The `template<class K, class\... Args, class F>` overloads only participate in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. 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, class F>` overloads only participate in overload resolution if 若`Hash::is_transparent` and 和`Pred::is_transparent` are valid member typedefs. 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.是有效的成员类型别名，则`template<class k,="" args,="" class="" f="">`重载版本才会参与重载决议。库假定`Hash`可同时接受`K`与`Key`类型的参数调用，且`Pred`是透明的。这支持异构查找，避免了实例化`Key`类型对象的开销。</class>
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The interface is exposition only, as C++ does not allow to declare a parameter `f` after a variadic parameter pack.
The interface is exposition only, as C++ does not allow to declare a parameter `f` after a variadic parameter pack.该接口仅为说明性用途，因为C++不允许在可变参数包之后声明参数`f`。
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Invalidates pointers and references to elements if a rehashing is issued.
Invalidates pointers and references to elements if a rehashing is issued.若执行重哈希操作，将使指向元素的指针和引用失效。
:1314
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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>
:1309
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>
:1304
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Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; No `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++
Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; No `value_type` is constructed if there is an element with an equivalent key; otherwise, the construction is of the form: + + -- ```c++返回值：插入成功则返回true。
并发：对当前对象*this进行重哈希时阻塞。
说明：若存在等价键的元素，则不会构造value_type；否则，构造形式为：
:1296
06/05/2026
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Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it. Otherwise, invokes `f` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.
Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it. Otherwise, invokes `f` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.若容器中不存在键为`k`的元素，则将由`k`和`args`构造的元素插入容器。否则，以等价元素的引用调用`f`；若使用`*_cvisit`重载版本，则该引用为常量引用。
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```c++ template<class... Args, class F> bool try_emplace_or_visit(const key_type& k, Args&&... args, F&& f); template<class... Args, class F> bool try_emplace_or_cvisit(const key_type& k, Args&&... args, F&& f); template<class... Args, class F> bool try_emplace_or_visit(key_type&& k, Args&&... args, F&& f); template<class... Args, class F> bool try_emplace_or_cvisit(key_type&& k, Args&&... args, F&& f); template<class K, class... Args, class F> bool try_emplace_or_visit(K&& k, Args&&... args, F&& f); template<class K, class... Args, class F> bool try_emplace_or_cvisit(K&& k, Args&&... args, F&& f); ```
```c++ template<class... Aargs,="" class F="" f=""> bool try_emplace_or_visit(const key_type&amp; k, Args&&amp;&amp;... args, F&&amp;&amp; f); template<class... Aargs,="" class F="" f=""> bool try_emplace_or_cvisit(const key_type&amp; k, Args&&amp;&amp;... args, F&&amp;&amp; f); template<class... Aargs,="" class F="" f=""> bool try_emplace_or_visit(key_type&& k, Args&&amp;&amp; k, Args&amp;&amp;... args, F&&amp;&amp; f); template<class... Aargs,="" class F="" f=""> bool try_emplace_or_cvisit(key_type&& k, Args&&amp;&amp; k, Args&amp;&amp;... args, F&&amp;&amp; f); template<class K,k,="" class... A="" args,="" class F="" f=""> bool try_emplace_or_visit(K&& k, Args&&amp;&amp; k, Args&amp;&amp;... args, F&&amp;&amp; f); template<class K,k,="" class... A="" args,="" class F="" f=""> bool try_emplace_or_cvisit(K&& k, Args&&... args, F&& f); ```amp;&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); ```</class></class></class...></class...></class...></class...>
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try_emplace_or_[c]visit
try_emplace_or_[c]visit
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---
---
:1274
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--
--
:1272
06/05/2026

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