ranged-loops - w3toppers.com

Is there a range class in C++11 for use with range based for loops?

The C++ standard library does not have one, but Boost.Range has boost::counting_range, which certainly qualifies. You could also use boost::irange, which is a bit more focused in scope. C++20’s range library will allow you to do this via view::iota(start, end).

C++11 reverse range-based for-loop

Actually Boost does have such adaptor: boost::adaptors::reverse. #include <list> #include <iostream> #include <boost/range/adaptor/reversed.hpp> int main() { std::list<int> x { 2, 3, 5, 7, 11, 13, 17, 19 }; for (auto i : boost::adaptors::reverse(x)) std::cout << i << ‘\n’; for (auto i : x) std::cout << i << ‘\n’; }