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After another question about iterators I’m having some doubts about custom containers. In my container, iterator is a subclass of const_iterator, so that I get conversion from non-const to const “for free”. But is this allowed or are there any drawbacks or non-working scenarios for such a setup?
Yes, this is fine. This is how VC10’s implementation of the iterators for
vectorare structured, for example. See_Vector_iteratorand_Vector_const_iteratorin<vector>.By the way, writing iterators is hard. It’s worth your time to learn and use the boost::iterator library.