Forward iterators

- [Instructor] The forward iterator is like a combination…of input and output iterators with a few other capabilities.…Here I have a working copy of forward iterator dot CPP…from chapter three of the exercise files.…The forward list is a single linked list type…and it's declared here in forward list header,…and it's designed to be efficient iterating…from beginning to end but not from end to beginning.…That's why it's a single linked list and uses…a forward iterator that can iterate forward…but it can not iterate back from end to beginning.…

In fact, we have a forward iterator here declared,…and if I were to say that IT one is equal to FL one dot end,…which would be the end of the list, and then try…to decrement the iterator when I build, you'll notice…that I get an error that I can not decrement the value…of a forward iterator, and that's because…the forward iterator hasn't even implemented…the decrement operator.…So, here we have a simple forward linked list,…and when I build and run, we have this for loop here.…