Description :The list::front() is a built-in function in C++ STL which is used to return a reference to the first element in a list container.
Example:
// Creating a list
std::list<int> demoList;
// Add elements to the List
demoList.push_back(10);
demoList.push_back(20);
demoList.push_back(30);
demoList.push_back(40);
// get the first element using front()
int ele = demoList.front();
// Print the first element
std::cout << ele;