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Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.当且仅当容器中不存在等价键时，将 `obj` 对象插入到容器中。
:791
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```c++ std::pair<iterator, bool> insert(value_type&& obj); ```
```c++ std::pair<iterator, bool=""> insert(value_type&&amp;&amp; obj); ```</iterator,>
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Move Insert
Move Insert移动插入
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:784
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; The bool component of the return type is true if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is需满足 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^]. Returns:;; The bool component of the return type is true if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.可复制插入^] 要求。返回：若执行了插入，则返回类型中的布尔分量为 `true`。+ +若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。说明：可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。+ +指向元素的指针和引用永远不会失效。
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Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.
Inserts `obj` in the container if and only if there is no element in the container with an equivalent key.当且仅当容器中不存在等价键时，将 `obj` 对象插入到容器中。
:772
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```c++ std::pair<iterator, bool> insert(const value_type& obj); ```
```c++ std::pair<iterator, bool=""> insert(const value_type&amp; obj); ```</iterator,>
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Copy Insert
Copy Insert复制插入
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---
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:765
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `args`. Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is需从 `args` 处满足对 `X` 的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `args`. Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. + + Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.可原位构造^] 要求。返回：若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。说明：标准对提示的含义表述相当模糊。但使用它的唯一实际方式，也是 Boost.Unordered 唯一支持的方式，是将其指向具有相同键的现有元素。+ +可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。+ +指向元素的指针和引用永远不会失效。
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`position` is a suggestion to where the element should be inserted.
`position` is a suggestion to where the element should be inserted.是一个关于元素应插入位置的提示。
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Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent value.
Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent value.当且仅当容器中没有等价值的元素时，插入一个使用参数 `args` 构造的对象。
:751
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```c++ template<class... Args> iterator emplace_hint(const_iterator position, Args&&... args); ```
```c++ template<class... Aargs=""> iterator emplace_hint(const_iterator position, Args&&amp;&amp;... args); ```</class...>
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emplace_hint
emplace_hint
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---
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:744
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `args`. Returns:;; The bool component of the return type is true if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent value. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.
Requires:;; 要求：`value_type` is需从 `args` 处满足对 `X` 的 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into `X` from `args`. Returns:;; The bool component of the return type is true if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent value. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated.可原位构造^] 要求。返回：若执行了插入，则返回类型中的布尔分量为 `true`。+ + 若执行了插入，则迭代器指向新插入的元素；否则指向等价的元素。 抛出：若调用 `hasher` 以外的操作抛出异常，则函数无效果。 说明：可能使迭代器失效，但仅当插入导致负载因子大于或等于最大负载因子时才会发生。+ + 指向元素的指针和引用永远不会失效。
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Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent value.
Inserts an object, constructed with the arguments `args`, in the container if and only if there is no element in the container with an equivalent value.当且仅当容器中没有等价值的元素时，插入一个使用参数 `args` 构造的对象。
:732
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```c++ template<class... Args> std::pair<iterator, bool> emplace(Args&&... args); ```
```c++ template<class... Aargs=""> std::pair<iterator, bool=""> emplace(Args&&amp;&amp;... args); ```</iterator,></class...>
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emplace
emplace原地构造
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Modifiers
Modifiers修改器
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