unordered_set clear() in C++

clear(): This function is available in the File: unordered_set.h

Syntax:

void std::unordered_set<int>::clear()

This function erases all elements in an unordered_set.

Note: This function only erases the elements and that if the elements themselves are pointers, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

File: unordered_set.h

For Example:

st = {9,4}

st.erase()= > It erases all the elements.

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    unordered_set<int> st;
    st.insert(9);
    st.insert(4);

    st.clear();

    cout << st.size() << "\n";

    return 0;
}

Output:

0