I just finished reading a great article on iterators by Andrei Alexandrescu. Mr. Alexandrescu is a contributor to the D programming language. In this paper,he discusses the background of iterator implementations including C++ STL iterators,and then goes on to outline a new model for iterators. It’s very readable,I recommend it.
http://www.informit.com/articles/article.aspx?p=1407357
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