std::experimental::ranges::View

Defined in header `<experimental/ranges/range>`
template< class T > concept bool View = Range<T> && Semiregular<T> && /* view-predicate<T> */;		(ranges TS)
template< class T > struct enable_view {};		(ranges TS)
struct view_base {};		(ranges TS)

The concept View<T> specifies the semiregular range T has constant-time copy, move, and assignment operations.

The /* view-predicate<T> */ portion of the concept is determined as follows:

if the qualified-id ranges::enable_view<T>::type is valid and denotes a type, ranges::enable_view<T>::type::value;
otherwise, if std::is_base_of_v<ranges::view_base, T> is true, true;
otherwise, if T is a specialization of std::initializer_list, std::set, std::multiset, std::unordered_set, or std::unordered_multiset, false;
otherwise, if both T and const T satisfy Range and ranges::reference_t <ranges::iterator_t<T>> is not the same type as ranges::reference_t<ranges::iterator_t<const T>>, false;
otherwise, true.