std::unordered_map::emplace
来自cppreference.com
< cpp | container | unordered map
 |
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| template< class... Args > std::pair<iterator,bool> emplace( Args&&... args ); |
（C++11 起） | |
一个新的元素插入到容器中。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)....原文：
Inserts a new element to the container. 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)....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
| args | - | 元素的构造函数的参数转发
原文： arguments to forward to the constructor of the element |
[编辑] 返回值
returns a pair consisting of a bool denoting whether the insertion took place and an iterator to the inserted element.
[编辑] 复杂性
Amortized constant on average, worst case linear in the size of the container.
[编辑] 另请参阅
| 构建了一丝元素的地方使用 原文： constructs elements in-place using a hint （公共成员函数） | |
| 插入元素 （公共成员函数） | |
