on Mon Jan 05 2009, Arno Schödl <aschoedl-AT-think-cell.com> wrote:
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?
It's not "so bad," it's just an unnecessary limitation. If you really need a random access counting iterator, you'd be out of luck. -- Dave Abrahams BoostPro Computing http://www.boostpro.com