unordered_multiset clear() function in C++ STL

The unordered_multiset::clear() is a built-in function in C++ STL which clears the contents of the unordered_multiset container. The final size of the container after the call of the function is 0.

Syntax:

unordered_multiset_name.clear()

Parameters: The function does not accept any parameter.



Return Value: It returns nothing.

Below programs illustrates the above function:

Program 1:

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// C++ program to illustrate the
// unordered_multiset::clear() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<int> sample;
  
    // inserts element
    sample.insert(11);
    sample.insert(11);
    sample.insert(11);
    sample.insert(12);
    sample.insert(13);
    sample.insert(13);
    sample.insert(14);
  
    cout << "Elements: ";
  
    for (auto it = sample.begin(); it != sample.end(); it++) {
        cout << *it << " ";
    }
  
    sample.clear();
  
    cout << "\nSize of container after function call: " 
         << sample.size();
  
    return 0;
}

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Output:

Elements: 14 11 11 11 12 13 13 
Size of container after function call: 0

Program 2:

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// C++ program to illustrate the
// unordered_multiset::clear() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multiset<int> sample;
  
    // inserts element
    sample.insert(1);
    sample.insert(1);
    sample.insert(1);
    sample.insert(2);
    sample.insert(3);
    sample.insert(4);
    sample.insert(3);
  
    cout << "Elements: ";
  
    for (auto it = sample.begin(); it != sample.end(); it++) {
        cout << *it << " ";
    }
  
    sample.clear();
  
    cout << "\nSize of container after function call: " 
         << sample.size();
  
    return 0;
}

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Output:

Elements: 1 1 1 2 3 3 4 
Size of container after function call: 0


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