C++ STL 中 unordered_multiset::bucket_size() 函数

unordered_multiset::bucket_size() 是 C++ STL 中的内置函数，它返回具有元素 val 的桶中的元素数。它始终低于桶计数。桶中的元素数量影响访问桶中特定元素所需的时间。

语法：

unordered_multiset_name.bucket_size(val)

参数： 该函数接受一个参数 val ，指定要返回其桶大小的元素。

返回值： 它返回一个无符号整数类型，表示具有元素 val 的桶中的元素数。

以下是上述函数的演示程序：

程序1：

// C++ program to illustrate the
// unordered_multiset::bucket_size() function
#include 
using namespace std;

int main()
{

    // declaration
    unordered_multiset sample;

    // inserts element
    sample.insert(11);
    sample.insert(11);
    sample.insert(11);
    sample.insert(12);
    sample.insert(13);
    sample.insert(13);
    sample.insert(14);

    for (auto it = sample.begin(); it != sample.end(); it++) {
        cout << "The bucket size in which " << *it
             << " is " << sample.bucket_size(*it) << endl;
    }
    return 0;
}

The bucket size in which 14 is 1
The bucket size in which 11 is 3
The bucket size in which 11 is 3
The bucket size in which 11 is 3
The bucket size in which 12 is 1
The bucket size in which 13 is 2
The bucket size in which 13 is 2

程序2：

// C++ program to illustrate the
// unordered_multiset::bucket_size() function
#include 
using namespace std;

int main()
{

    // declaration
    unordered_multiset sample;

    // inserts element
    sample.insert(1);
    sample.insert(1);
    sample.insert(1);
    sample.insert(2);
    sample.insert(3);
    sample.insert(4);
    sample.insert(3);

    for (auto it = sample.begin(); it != sample.end(); it++) {
        cout << "The bucket size in which " << *it
             << " is " << sample.bucket_size(*it) << endl;
    }
    return 0;
}

The bucket size in which 1 is 3
The bucket size in which 1 is 3
The bucket size in which 1 is 3
The bucket size in which 2 is 1
The bucket size in which 3 is 2
The bucket size in which 3 is 2
The bucket size in which 4 is 1