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.
// C++ program for illustration of // multimap::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;
} |
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