unordered_multimap::bucket_size()
描述 (Description)
C ++函数std::unordered_multimap::bucket_size()返回第n 个存储桶中显示的元素数。
声明 (Declaration)
以下是std :: unordered_multimap :: bucket_size()函数形式std :: unordered_map()头的声明。
C++11
size_type bucket_size(size_type n) const;
参数 (Parameters)
n - 铲斗编号。
返回值
返回当前存储桶中的元素总数。
时间复杂
线性即O(n)
例子 (Example)
以下示例显示了std :: unordered_multimap :: bucket_size()函数的用法。
#include <iostream>
#include <unordered_map>
using namespace std;
int main(void) {
unordered_multimap<char, int> umm = {
{'a', 1},
{'b', 2},
{'c', 3},
{'d', 4},
{'e', 5}
};
for (int i = 0; i < umm.bucket_count(); ++i)
cout << "Bucket " << i << " contains "
<< umm.bucket_size(i) << " elements." << endl;
return 0;
}
让我们编译并运行上面的程序,这将产生以下结果 -
Bucket 0 contains 1 elements.
Bucket 1 contains 1 elements.
Bucket 2 contains 1 elements.
Bucket 3 contains 0 elements.
Bucket 4 contains 0 elements.
Bucket 5 contains 0 elements.
Bucket 6 contains 0 elements.
Bucket 7 contains 0 elements.
Bucket 8 contains 0 elements.
Bucket 9 contains 1 elements.
Bucket 10 contains 1 elements.