std::unordered_multiset::empty
来自cppreference.com
< cpp | container | unordered multiset
 |
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| bool empty() const; |
（C++11 起） | |
检查，如果容器有任何元素，即是否begin() == end().
Original:
Checks if the container has no elements, i.e. whether begin() == end().
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目录 |
[编辑] 参数
（无）
Original:
(none)
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[编辑] 返回值
true如果容器是空的，false其他方式
Original:
true if the container is empty, false otherwise
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[编辑] 例外
[编辑] 复杂性
常数
Original:
Constant
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[编辑] 为例
下面的代码使用
empty检查，如果std::unordered_multiset<int>包含任何元素
Original:
The following code uses
empty to check if a std::unordered_multiset<int> contains any elements:
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#include <unordered_multiset> #include <iostream> int main() { std::unordered_multiset<int> numbers; std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n'; numbers.push_back(42); numbers.push_back(13317); std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n'; }
Output:
Initially, numbers.empty(): 1 After adding elements, numbers.empty(): 0
See also
| 返回的元素数 Original: returns the 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. （公共成员函数） | |
