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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.
Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it.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。
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```c++ template<class... Args> bool try_emplace(const key_type& k, Args&&... args); template<class... Args> bool try_emplace(key_type&& k, Args&&... args); template<class K, class... Args> bool try_emplace(K&& k, Args&&... args); ```
```c++ template<class... Aargs=""> bool try_emplace(const key_type&amp; k, Args&&amp;&amp;... args); template<class... Aargs=""> bool try_emplace(key_type&& k, Args&&amp;&amp; k, Args&amp;&amp;... args); template<class K,k,="" class... Args="" args=""> bool try_emplace(K&& k, Args&&... args); ```amp;&amp; k, Args&amp;&amp;... args); ```</class></class...></class...>
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try_emplace
try_emplace
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---
---
:1236
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Returns:;; The number of elements inserted.
Returns:;; The number of elements inserted.返回值：插入的元素数量。
:1234
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Equivalent to [listing,subs="+macros,+quotes"]
Equivalent to等效于 [listing,subs="+macros,+quotes"]
:1227
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```c++ template<class F1, class F2> size_type insert_and_visit(std::initializer_list<value_type> il, F1 f1, F2 f2); template<class F1, class F2> size_type insert_and_cvisit(std::initializer_list<value_type> il, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> size_type insert_and_visit(std::initializer_list<value_type> il, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> size_type insert_and_cvisit(std::initializer_list<value_type> il, F1 f1, F2 f2); ```</value_type></class></value_type></class>
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Insert Initializer List and Visit
Insert Initializer List and Visit初始化列表插入并访问
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---
---
:1217
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Returns:;; The number of elements inserted.
Returns:;; The number of elements inserted.返回值：插入的元素数量。
:1215
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Equivalent to [listing,subs="+macros,+quotes"]
Equivalent to等效于 [listing,subs="+macros,+quotes"]
:1208
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```c++ template<class InputIterator, class F1, class F2> size_type insert_or_visit(InputIterator first, InputIterator last, F1 f1, F2 f2); template<class InputIterator, class F1, class F2> size_type insert_or_cvisit(InputIterator first, InputIterator last, F1 f1, F2 f2); ```
```c++ template<class IinputIiterator,="" class F1, class F2="" f1,="" f2=""> size_type insert_or_visit(InputIterator first, InputIterator last, F1 f1, F2 f2); template<class IinputIiterator,="" class F1, class F2="" f1,="" f2=""> size_type insert_or_cvisit(InputIterator first, InputIterator last, F1 f1, F2 f2); ```</class></class>
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Insert Iterator Range and Visit
Insert Iterator Range and Visit迭代器范围插入并访问
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---
---
:1198
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Invalidates pointers and references to elements if a rehashing is issued. + + In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `value_type&&` argument participate in overload resolution only if `std::remove_reference<decltype(obj)>::type` is `value_type`.
Requires:;; 要求：`value_type` is需满足 https://en.cppreference.com/w/cpp/named_req/MoveInsertable[MoveInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Invalidates pointers and references to elements if a rehashing is issued. + + In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `value_type&&` argument participate in overload resolution only if可移动插入^] 要求。返回：若执行了插入则返回 `true`。并发：在 `*this` 的 rehash 操作上阻塞。注意：如果执行了 rehash，则指向元素的指针和引用会失效。+ +在形式为 `insert_and_[c]visit(obj, f1, f2)` 的调用中，接受 `value_type&amp;&amp;` 参数的重载仅当 `std::remove_reference<decltype(obj)>::type` is为 `value_type`. 时才参与重载决议。</decltype(obj)>
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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key, 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 `obj` in the table if and only if there is no element in the table with an equivalent key, 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.当且仅当容器中不存在等价键的元素时，插入obj，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。
:1185
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```c++ template<class F1, class F2> bool insert_and_visit(value_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(value_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_visit(init_type&& obj, F1 f1, F2 f2); template<class F1, class F2> bool insert_and_cvisit(init_type&& obj, F1 f1, F2 f2); ```
```c++ template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(value_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(value_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_visit(init_type&&amp;&amp; obj, F1 f1, F2 f2); template<class Ff1,="" class F2="" f2=""> bool insert_and_cvisit(init_type&&amp;&amp; obj, F1 f1, F2 f2); ```</class></class></class></class>
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Move insert_and_[c]visit
Move移动 insert_and_[c]visit
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---
---
:1175
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Invalidates pointers and references to elements if a rehashing is issued. + + In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `const value_type&` argument participate in overload resolution only if `std::remove_cv<std::remove_reference<decltype(obj)>::type>::type` is `value_type`.
Requires:;; 要求：`value_type` is需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; `true` if an insert took place. + Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Invalidates pointers and references to elements if a rehashing is issued. + + In a call of the form `insert_and_[c]visit(obj, f1, f2)`, the overloads accepting a `const value_type&` argument participate in overload resolution only if可复制插入^] 要求。返回：若执行了插入则返回 `true`。并发：在 `*this` 的 rehash 操作上阻塞。注意：如果执行了 rehash，则指向元素的指针和引用会失效。+ +在形式为 `insert_and_[c]visit(obj, f1, f2)` 的调用中，接受 `const value_type&amp;` 参数的重载仅当 `std::remove_cv<std::remove_reference<decltype(obj)>::type>&gt;::type` is为 `value_type`. 时才参与重载决议。</std::remove_reference<decltype(obj)>
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