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Hi,
I am new and I wanted to contribute.
The ticker #11847 says,"reference typedef no longer available in parent class of iterator_facade" but actually I think reference is available in class iterator_facade itself(boost/iterator/iterator_facade.hpp).
But still we are not able to use reference in class simple_iterator : public boost::iterator_facade
From my side I can only solve this kind of problem by
using typename boost::iterators::iterator_facade