Range proposal has been there for a long time unfortunately it got defined using concepts mechanism http://en.cppreference.com/w/cpp/language/constraints http:/

Range proposal has been there for a long time unfortunately it got defined using concepts mechanism http://en.cppreference.com/w/cpp/language/constraints http://en.cppreference.com/w/cpp/language/constraints . Concepts is a lot more complicated change. This mostly affects wording in standardese text and potentially quality of compiler errors. It could be possible to have ranges without concepts but that would require rewriting most of the proposal. There is even an existing implementation which is c++11 compatible.