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unordered_multiset bucket_count() function in C++ STL

The unordered_multiset::bucket_count() is a built-in function in C++ STL which returns the total number of buckets in the unordered_multiset container. A bucket is a slot in the container’s internal hash table to which elements are assigned based on their hash value.

Syntax:

unordered_multiset_name.bucket_count()

Parameters: The function does not accepts any parameter.

Return Value: It returns an unsigned integral type which denotes the total count of buckets.

Below programs illustrate the above function:

Program 1:




// C++ program to illustrate the
// unordered_multiset::bucket_count() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<char> sample;
  
    // inserts element
    sample.insert('a');
    sample.insert('b');
    sample.insert('b');
    sample.insert('b');
    sample.insert('z');
  
    cout << "The total count of buckets: " << sample.bucket_count();
  
    // prints all element bucket wise
    for (int i = 0; i < sample.bucket_count(); i++) {
  
        cout << "\nBucket " << i << ": ";
  
        // if bucket is empty
        if (sample.bucket_size(i) == 0)
            cout << "empty";
  
        for (auto it = sample.cbegin(i); it != sample.cend(i); it++)
            cout << *it << " ";
    }
    return 0;
}

Output:
The total count of buckets: 7
Bucket 0: b b b 
Bucket 1: empty
Bucket 2: empty
Bucket 3: z 
Bucket 4: empty
Bucket 5: empty
Bucket 6: a

Program 2:




// C++ program to illustrate the
// unordered_multiset::bucket_count() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<char> sample;
  
    // inserts element
    sample.insert('a');
    sample.insert('b');
    sample.insert('b');
    sample.insert('b');
    sample.insert('z');
  
    cout << "The total count of buckets: " << sample.bucket_count();
  
    // prints all element bucket wise
    for (int i = 0; i < sample.bucket_count(); i++) {
  
        cout << "\nBucket " << i << ": ";
  
        // if bucket is empty
        if (sample.bucket_size(i) == 0)
            cout << "empty";
  
        for (auto it = sample.cbegin(i); it != sample.cend(i); it++)
            cout << *it << " ";
    }
    return 0;
}

Output:
The total count of buckets: 7
Bucket 0: b b b 
Bucket 1: empty
Bucket 2: empty
Bucket 3: z 
Bucket 4: empty
Bucket 5: empty
Bucket 6: a

Article Tags :
C++