The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
template<typename T>
class ListNodeIterator
: public IteratorFacade<ListNodeIterator<T>, T,
std::forward_iterator_tag>
{
ListNode<T>* current = nullptr;
public:
T& dereference() const {
return current->value;
}
void increment() {
current = current->next;
}
bool equals(ListNodeIterator const& other) const {
return current == other.current;
}
ListNodeIterator(ListNode<T>* current = nullptr) : current(current) { }
};