[boost] [range] why not adding conversion operator std::pair<FTI.FTI> to boost iterator_range

Wouldn't it be a good idea to add a conversion operator to the class iterator_range? This would allow to write functions returning a range, instead of a pair of iterators, but boost::tie would still work with it. Best regards, andreas -- Andreas Fabri, PhD Chief Officer, GeometryFactory Editor, The CGAL Project phone: +33.492.954.912 skype: andreas.fabri