Mastering C++ Programming

Code walkthrough

The following code declares and initializes the forward_list container with some unique values and some duplicate values:

forward_list<int> l = { 10, 10, 20, 30, 45, 45, 50 };

As the forward_list container doesn't support the size() function, we used the distance() function to find the size of the list:

cout << "\nSize of list with duplicates is " << distance( l.begin(), l.end() ) << endl;

The following forward_list<int>::unique() function removes the duplicate integers and retains only the unique values:

l.unique();