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unordered_multiset swap() function in C++ STL

Last Updated : 02 Jun, 2021

The unordered_multiset::swap() is a built-in function in C++ STL which swaps the contents of two unordered_multiset
containers.

Note: Both of the containers should have the same type of elements. Sizes of the containers may differ.

Syntax:

unordered_multiset1.swap(unordered_multiset2);

Parameters: The function accepts only one compulsory parameter i.e unordered_multiset2 with which the swapping of unordered_multiset1 is to be done.

Return Value: It does not return any value.

Below programs illustrate the above function.

Program 1:

C++


 // C++ program to illustrate
// unordered_multiset::swap()
#include <iostream>
#include <string>
#include <unordered_set>

using namespace std;

// Function to display the contents of multiset s.
void display(unordered_multiset<int> s)
{
    for (auto it = s.begin(); it != s.end(); it++)
        cout << *it<<" ";
    cout<<"\n";    
}

int main()
{
    // Declaration
    unordered_multiset<int> s1, s2;

    // initializing both multisets(sizes are different)
    s1 = { 1, 2, 3, 4 };
    s2 = { 10, 20, 30, 40, 50 };

    // displaying initial values
    cout << "Initial values of s1 are: \n";
    display(s1);
    cout << endl;

    cout << "Initial values of s2 are: \n";
    display(s2);
    cout << endl;
    
    // swapping the values
    s1.swap(s2);

    // display final values
    cout << "Final values of s1 are: \n";
    display(s1);
    cout << endl;

    cout << "Final values of s2 are: \n";
    display(s2);

    return 0;
}

Output:

Initial values of s1 are: 
4 3 2 1 

Initial values of s2 are: 
50 40 30 20 10 

Final values of s1 are: 
50 40 30 20 10 

Final values of s2 are: 
4 3 2 1

Program 2:

C++


 // C++ program to illustrate
// unordered_multiset::swap()
#include <iostream>
#include <string>
#include <unordered_set>

using namespace std;

// Function to display the contents of multiset s
void display(unordered_multiset<string> s) 
{
    for (auto it = s.begin(); it != s.end(); it++)
        cout << *it << " ";
    cout<<endl;
}

int main()
{
    // Declaration
    unordered_multiset<string> s1, s2; 

    // Initializing both multisets(sizes are different)
    s1 = { "Geeks", "for", "Geeks" };
    s2 = { "Computer", "Science", "Portal", "for", "Geeks" };

    // Displaying initial values
    cout << "Initial values of s1 are: \n";
    display(s1);
    cout << endl;

    cout << "Initial values of s2 are: \n";
    display(s2);
    cout << endl;
    
    // Swapping
    s1.swap(s2);

    // Display final values
    cout << "Final values of s1 are: \n";
    display(s1);
    cout << endl;

    cout << "Final values of s2 are: \n";
    display(s2);
    
    return 0;
}

Output:

Initial values of s1 are: 
for Geeks Geeks 

Initial values of s2 are: 
Geeks for Portal Science Computer 

Final values of s1 are: 
Geeks for Portal Science Computer 

Final values of s2 are: 
for Geeks Geeks

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