std::experimental::ranges::Range
From cppreference.com
                    
                                        
                    < cpp | experimental | ranges
                    
                                                            
                    | Defined in header  <experimental/ranges/range> | ||
| template< class T > concept bool Range = | (ranges TS) | |
Given an lvalue t of type std::remove_reference_t<T>, Range<T> is satisfied only if
-  [ranges::begin(t),ranges::end(t))denotes a range; and
- both ranges::begin(t) and ranges::end(t) are amortized constant time and non-modifying.
-  If ranges::iterator_t<T> satisfies ForwardIterator, ranges::begin(t) is equality preserving.


