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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.当且仅当哈希表中不存在键等价的元素时，将`obj`插入表中。
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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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---
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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:;; 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:;; If可由参数 `args` 构造。
返回值：;; 成功插入元素时返回 `true`。
并发特性：;; 当对当前对象执行重哈希操作时会阻塞。
注意：;; 若 `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.格式为 `k,v`，则会仅使用参数 `k` 进行键检查，**直到确定需要插入元素时**，才会构造完整对象。
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.当且仅当哈希表中不存在等价键的元素时，才会使用参数 `args` 构造对象并插入到哈希表中。
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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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---
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Returns:;; `size()` of the largest possible table.
Returns:;; `size()` of the largest possible table.返回值：;; 哈希表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，返回的值可能无法精确反映函数执行完成后哈希表的真实大小。
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Returns:;; The number of elements in the table.
Returns:;; The number of elements in the table.返回值：;; 哈希表中的元素总数。
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```c++ size_type size() const noexcept; ```
```c++ size_type size() const noexcept; ```
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size
size大小
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---
---
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Returns:;; `size() == 0`
Returns:返回值：;; `size() == 0`（容器为空时返回 true，否则返回 false）
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