std::unordered_multimap::size
来自cppreference.com
< cpp | container | unordered multimap
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| size_type size() const; |
（C++11 起） | |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
目錄 |
[编辑] 參數
（無）
Original:
(none)
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[编辑] 返回值
在容器中的元素的數量
Original:
the number of elements in the container
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[编辑] 例外
[编辑] 複雜性
Constant
[编辑] 為例
The following code uses size to display the number of elements in a std::unordered_multimap<int>:
#include <unordered_multimap> #include <iostream> int main() { std::unordered_multimap<int, char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}}; std::cout << "nums contains " << nums.size() << " elements.\n"; }
Output:
nums contains 4 elements.
[编辑] 另請參閱
| 檢查是否容器是空的 Original: checks whether the container is empty The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成員函數） | |
| 返回可能的最大數量的元素 Original: returns the maximum possible number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成員函數） | |
