multimap operator = in C++ STL

The multimap::operator= is a built in C++ STL which assigns new contents to the container, replacing its current content.

Syntax:

multimap1_name = multimap2_name

Parameters: The multimap on the left is the container in which the multimap on the right is to be assigned by destroying the elements of multimap1.



Return Value: This function does not return anything.

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// C++ program for illustration of
// multiset::operator= function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // initialize container
    multimap<int, int> mp, copymp;
  
    // insert elements in random order
    mp.insert({ 2, 30 });
    mp.insert({ 1, 40 });
    mp.insert({ 2, 60 });
    mp.insert({ 2, 20 });
    mp.insert({ 1, 50 });
    mp.insert({ 4, 50 });
  
    // = operator is used to copy map
    copymp = mp;
  
    // prints the elements
    cout << "\nThe multimap mp1 is : \n";
    cout << "KEY\tELEMENT\n";
    for (auto itr = mp.begin(); itr != mp.end(); ++itr) {
        cout << itr->first
             << '\t' << itr->second << '\n';
    }
  
    cout << "\nThe multimap copymap is : \n";
    cout << "KEY\tELEMENT\n";
    for (auto itr = copymp.begin(); itr != copymp.end(); ++itr) {
        cout << itr->first
             << '\t' << itr->second << '\n';
    }
    return 0;
}

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Output:

The multimap mp1 is : 
KEY    ELEMENT
1    40
1    50
2    30
2    60
2    20
4    50

The multimap copymap is : 
KEY    ELEMENT
1    40
1    50
2    30
2    60
2    20
4    50


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