Iterators provide an easy way of cycling through the elements of a singly linked list.
Iterators provide an easy way of cycling through the elements of a singly
linked list, using the post increment operator++. They avoid
the need to access the inner detail of link objects and list headers.
An iterator is an instance of the templated class TSglQueIter<class
T>. The class provides the behaviour for moving through the elements
of a specific list. An iterator maintains a pointer to the current element
in the list. The current element can be any element in the list.