currently, counting_iterator<T>::reference is Incrementable const&. This makes reverse_iterator< counting_iterator<T> >::dereference return a reference to a temporary variable:
typename super_t::reference dereference() const { return *boost::prior(this->base()); }
IMO, the solution is to make counting_iterator return by value.
But then it is no longer a C++03 random access iterator.
The same is true for a random_access_traversal transform_iterator with a functor returning by value. Why is this so bad?
Could you please open a Trac ticket for this one?
Done. Arno -- Dr. Arno Schoedl · aschoedl@think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229