# std::experimental::ranges::View

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< cpp‎ | experimental‎ | ranges

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.

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