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:1439
English
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++
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:1368
--
--
:1370
---
---
try_emplace_or_[c]visit
try_emplace_or_[c]visit
```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... args,="" class="" f=""> bool try_emplace_or_visit(const key_type&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); template<class... args,="" class="" f=""> bool try_emplace_or_cvisit(const key_type&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); template<class... args,="" class="" f=""> bool try_emplace_or_visit(key_type&amp;&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); template<class... args,="" class="" f=""> bool try_emplace_or_cvisit(key_type&amp;&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); template<class k,="" class...="" args,="" class="" f=""> bool try_emplace_or_visit(K&amp;&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); template<class k,="" class...="" args,="" class="" f=""> bool try_emplace_or_cvisit(K&amp;&amp; k, Args&amp;&amp;... args, F&amp;&amp; f); ```</class></class></class...></class...></class...></class...>
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.
若表中不存在键为`k`的元素，则将由`k`和`args`构造的元素插入表中。
否则，以指向等价元素的引用调用`f`；当且仅当使用`*_cvisit`重载版本时，该引用为常量引用。
:1392
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：;; 若执行插入操作则返回 true。
并发特性：;; 阻塞对 *this 的重哈希操作。
注意：;; 若已存在等价键的元素，则不会构造 value_type；否则，构造方式如下：
:1400
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<key>(k)), std::forward_as_tuple(std::forward<args>(args)...))</args></key>
:1405
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<k>(k)), std::forward_as_tuple(std::forward<args>(args)...)) ```</args></k>
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法，因为 C++ 不允许在可变参数包之后声明参数 `f`。
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.
仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员类型别名时，`template<class k,="" args,="" class="" f="">` 这些重载版本才会参与重载决议。库假定 `Hash` 可同时接受 `K` 类型和 `Key` 类型作为参数，且 `Pred` 是透明的。这支持**异构查找**，从而避免实例化 `Key` 类型对象带来的性能开销。</class>
:1414
--
--
:1416
---
---
try_emplace_and_[c]visit
try_emplace_and_[c]visit
```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... args,="" class="" f1,="" f2=""> bool try_emplace_and_visit(const key_type&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class... args,="" class="" f1,="" f2=""> bool try_emplace_and_cvisit(const key_type&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class... args,="" class="" f1,="" f2=""> bool try_emplace_and_visit(key_type&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class... args,="" class="" f1,="" f2=""> bool try_emplace_and_cvisit(key_type&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class k,="" class...="" args,="" class="" f1,="" f2=""> bool try_emplace_and_visit(K&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); template<class k,="" class...="" args,="" class="" f1,="" f2=""> bool try_emplace_and_cvisit(K&amp;&amp; k, Args&amp;&amp;... args, F1&amp;&amp; f1, F2&amp;&amp; f2); ```</class></class></class...></class...></class...></class...>
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.
若表中不存在键为`k`的元素，则将由`k`和`args`构造的元素插入表中，随后以非常量引用指向新创建的元素并调用`f1`。
否则，以指向等价元素的引用调用`f2`；当且仅当使用`*_cvisit`重载版本时，该引用为常量引用。
:1439
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：;; 若执行插入操作则返回 true。
并发特性：;; 阻塞对 *this 的重哈希操作。
注意：;; 若已存在等价键的元素，则不会构造 value_type；否则，构造方式如下：
:1447
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<key>(k)), std::forward_as_tuple(std::forward<args>(args)...))</args></key>
:1452
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<k>(k)), std::forward_as_tuple(std::forward<args>(args)...)) ```</args></k>
The interface is exposition only, as C++ does not allow to declare parameter `f1` and `f2` after a variadic parameter pack.
该接口仅为说明性用法，因为 C++ 不允许在可变参数包之后声明 `f1` 和 `f2` 参数。
The `template<class K, class\... Args, class F1, class F2>` 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.
仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 为有效成员类型别名时，`template<class k,="" args,="" class="" f1,="" f2="">` 这些重载版本才会参与重载决议。
库假定 `Hash` 可同时接受 `K` 类型与 `Key` 类型作为参数，且 `Pred` 是透明的。
这支持**异构查找**，从而避免实例化 `Key` 类型对象带来的性能开销。</class>
:1461
--
--
:1463
---
---
insert_or_assign
insert_or_assign
```c++ template<class M> bool insert_or_assign(const key_type& k, M&& obj); template<class M> bool insert_or_assign(key_type&& k, M&& obj); template<class K, class M> bool insert_or_assign(K&& k, M&& obj); ```
```c++ template<class m=""> bool insert_or_assign(const key_type&amp; k, M&amp;&amp; obj); template<class m=""> bool insert_or_assign(key_type&amp;&amp; k, M&amp;&amp; obj); template<class k,="" class="" m=""> bool insert_or_assign(K&amp;&amp; k, M&amp;&amp; obj); ```</class></class></class>
Inserts a new element into the table or updates an existing one by assigning to the contained value.
向表中插入新元素，或通过为已包含的值赋值来更新现有元素。
If there is an element with key `k`, then it is updated by assigning `std::forward<M>(obj)`.
若表中存在键为`k`的元素，则通过`std::forward<m>(obj)`赋值来更新该元素。</m>
If there is no such element, it is added to the table as: ```c++
若不存在该元素，则以如下形式添加到表中：
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Key>(k)), std::forward_as_tuple(std::forward<M>(obj)))
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<key>(k)), std::forward_as_tuple(std::forward<m>(obj)))</m></key>
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), std::forward_as_tuple(std::forward<M>(obj))) ```
value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<k>(k)), std::forward_as_tuple(std::forward<m>(obj))) ```</m></k>
Returns:;; `true` if an insert took place. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; The `template<class K, class M>` only participates 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.
返回值：;; 若执行插入操作则返回 `true`。
并发特性：;; 阻塞对 `*this` 的重哈希操作。
注意：;; 仅当 `Hash::is_transparent` 和 `Pred::is_transparent` 是有效的成员类型别名时，`template<class k,="" class="" m="">` 才参与重载决议。库假定 `Hash` 可同时接受 `K` 类型与 `Key` 类型作为参数，且 `Pred` 是透明的。这支持异构查找，从而避免实例化 `Key` 类型对象带来的性能开销。</class>
:1494
---
---
Key English Chinese (Simplified Han script) Actions
:1310
---
---
:1326
Returns:;; An `insert_return_type` object constructed from `inserted` and `node`: +
返回值：;; 由 `inserted` 和 `node` 构造的 `insert_return_type` 对象：
:1327
If `nh` is empty, `inserted` is `false` and `node` is empty.
若 `nh` 为空，则 `inserted` 为 `false` 且 `node` 为空。
:1328
Otherwise if the insertion took place, `inserted` is true and `node` is empty.
若插入操作成功，则 `inserted` 为 true， 且 `node` 为空。
:1329
If the insertion failed, `inserted` is false and `node` has the previous value of `nh`.
若插入操作失败，则 `inserted` 为 false ，且 `node` 保留 `nh` 的原值。
:1334
---
---
:1354
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<key>(k)), std::forward_as_tuple(std::forward<args>(args)...))</args></key>
:1359
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<k>(k)), std::forward_as_tuple(std::forward<args>(args)...)) ```</args></k>
:1368
--
--
:1370
---
---
:1392
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：;; 若执行插入操作则返回 true。
并发特性：;; 阻塞对 *this 的重哈希操作。
注意：;; 若已存在等价键的元素，则不会构造 value_type；否则，构造方式如下：
:1400
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<key>(k)), std::forward_as_tuple(std::forward<args>(args)...))</args></key>
:1405
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<k>(k)), std::forward_as_tuple(std::forward<args>(args)...)) ```</args></k>
:1414
--
--
:1416
---
---
:1439
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：;; 若执行插入操作则返回 true。
并发特性：;; 阻塞对 *this 的重哈希操作。
注意：;; 若已存在等价键的元素，则不会构造 value_type；否则，构造方式如下：
:1447
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<key>(k)), std::forward_as_tuple(std::forward<args>(args)...))</args></key>
:1452
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<k>(k)), std::forward_as_tuple(std::forward<args>(args)...)) ```</args></k>
:1461
--
--
:1463
---
---
:1494
---
---
:1509
---
---
:1528
---
---
:1530
erase_if
erase_if
:1541
---
---
:1559
---
---
:1576
---
---
:1591
---
---
:1606
---
---
:1619
---
---

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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：;; 若执行插入操作则返回 true。
并发特性：;; 阻塞对 *this 的重哈希操作。
注意：;; 若已存在等价键的元素，则不会构造 value_type；否则，构造方式如下：
:1439
06/05/2026
User avatar admin

String added in the repository
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++
:1439
06/05/2026
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Key
:1439
Flags
safe-html, strict-same
Unit identifier
52091
Source string location
:1439
String age
06/05/2026
Last updated
06/06/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/modules/ROOT/pages/reference/concurrent_node_map_zh_Hans.adoc, string 339