map operator= in C++ STL
The map::operator= is a built function in C++ STL which assigns contents of a container to a different container, replacing its current content.
Syntax:
map1_name = map2_name
Parameters: The map on the left is the container in which the map on the right is to be assigned by destroying the elements of map1.
Return Value: This function does not return anything.
CPP
// C++ program for illustration of // map::operator= function #include <bits/stdc++.h> using namespace std; int main() { // initialize container map< int , int > mp, copymp; // insert elements in random order mp.insert({ 2, 30 }); mp.insert({ 1, 40 }); mp.insert({ 4, 50 }); // = operator is used to copy map copymp = mp; // prints the elements cout << "\nThe map mp is : \n"; cout << "KEY\tELEMENT\n"; for ( auto itr = mp.begin(); itr != mp.end(); ++itr) { cout << itr->first << '\t' << itr->second << '\n' ; } cout << "\nThe map 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 map mp is : KEY ELEMENT 1 40 2 30 4 50 The map copymap is : KEY ELEMENT 1 40 2 30 4 50
Time Complexity : O(n*log n) , Where n is the number of inserted elements
Auxiliary Space : O(n)