std::unordered_map::emplace_hint
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< cpp | container | unordered map
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| template <class... Args> iterator emplace_hint( const_iterator hint, Args&&... args ); |
（C++11 起） | |
插入一个新元素的容器，使用
hint一个建议，其中的元素。该元件是构成在就地，即没有复制或移动操作进行。 The constructor of the element type (value_type, that is, std::pair<const Key, T>) is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....Original:
Inserts a new element to the container, using
hint as a suggestion where the element should go. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element type (value_type, that is, std::pair<const Key, T>) is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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If rehashing occurs due to the insertion, all iterators are invalidated. Otherwise iterators are not affected. References are not invalidated. Rehashing occurs only if the new number of elements is higher than max_load_factor()*bucket_count().
目录 |
[编辑] 参数
| hint | - | 迭代器，用于插入新的元素，作为一个建议
Original: iterator, used as a suggestion as to where to insert the new element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| args | - | 元素的构造函数的参数转发
Original: arguments to forward to the constructor of the element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[编辑] 返回值
返回一个迭代器新插入的元素.
Original:
Returns an iterator to the newly inserted element.
The text has been machine-translated via Google Translate.
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If the insertion failed because the element already exists, returns an iterator to the already existing element with the equivalent key.
[编辑] 复杂性
Amortized constant on average, worst case linear in the size of the container.
[编辑] 另请参阅
| constructs element in-place （公共成员函数） | |
| 插入元素 Original: inserts elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数） | |
