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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key.
Inserts `obj` in the table if and only if there is no element in the table with an equivalent key.当且仅当容器中无等价键的元素时，将对象 obj 插入容器。
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```c++ bool insert(value_type&& obj); bool insert(init_type&& obj); ```
```c++ bool insert(value_type&&& obj); bool insert(init_type&&& obj); ```
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Move Insert
Move Insert移动插入
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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. + + A call of the form `insert(x)`, where `x` is equally convertible to both `const value_type&` and `const init_type&`, is not ambiguous and selects the `init_type` overload.
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. + + A call of the form `insert(x)`, where `x` is equally convertible to both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。+ +形式为 `insert(x)` 的调用（其中 `x` 可同等转换为 `const value_type&` andamp;` 和 `const init_type&`, is not ambiguous and selects theamp;`）不会产生歧义，并且会选择 `init_type` overload.重载。
06/05/2026
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Inserts `obj` in the table if and only if there is no element in the table with an equivalent key.
Inserts `obj` in the table if and only if there is no element in the table with an equivalent key.当且仅当容器中不存在等价键的元素时，才将对象 obj 插入到容器中。
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```c++ bool insert(const value_type& obj); bool insert(const init_type& obj); ```
```c++ bool insert(const value_type& obj); bool insert(const init_type& obj); ```
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Copy Insert
Copy Insert复制插入
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Requires:;; `value_type` is constructible from `args`. 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. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.
Requires:;; 要求：`value_type` is constructible from `args`. 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. + + If `args...` is of the form `k,v`, it delays constructing the whole object until it is certain that an element should be inserted, using only the `k` argument to check.可从 `args` 构造。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。+ +若 `args...` 的形式为 `k,v`，则仅在确定应插入元素时才构造整个对象，检查时仅使用 `k` 参数。
06/05/2026
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Inserts an object, constructed with the arguments `args`, in the table if and only if there is no element in the table with an equivalent key.
Inserts an object, constructed with the arguments `args`, in the table if and only if there is no element in the table with an equivalent key.当且仅当容器中不存在等价键的元素时，才会使用参数 args 构造对象并插入到容器中。
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```c++ template<class... Args> bool emplace(Args&&... args); ```
```c++ template<class... Aargs=""> bool emplace(Args&&amp;&amp;... args); ```</class...>
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emplace
emplace原地构造
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Modifiers
Modifiers修改器
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Returns:;; `size()` of the largest possible table.
Returns:;; `size()` of the largest possible table.返回值：容器所能容纳的最大元素数量（最大容量）。
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```c++ size_type max_size() const noexcept; ```
```c++ size_type max_size() const noexcept; ```
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max_size
max_size
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---
---
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Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect the true size of the table right after execution.
Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect the true size of the table right after execution.注意：在存在并发插入操作时，返回的值可能无法准确反映函数执行后容器的真实大小。
06/05/2026

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