The map::max_size() is a built-in function in C++ STL which returns the maximum number of elements a map container can hold.
Syntax:
map_name.max_size()
Parameters: This function does not accept any parameters.
Return Value: This function returns the maximum number of elements a map container can hold.
CPP
// C++ program to illustrate // map::max_size() #include <bits/stdc++.h> using namespace std;
int main()
{ // initialize container
map< int , int > mp1, mp2;
mp1.insert({ 1, 2 });
// max size of Non-empty map
cout << "The max size of mp1 is " << mp1.max_size();
// max size of Empty-map
cout << "\nThe max size of mp2 is " << mp2.max_size();
return 0;
} |
Output:
The max size of mp1 is 461168601842738790 The max size of mp2 is 461168601842738790
Time Complexity – Constant O(1)