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std::ranges::ViewableRange

Defined in header <ranges>
template<class T>
  concept ViewableRange =
    Range<T> && (__ForwardingRange<T> || View<std::decay_t<T>>);

The ViewableRange concept is a refinement of Range that describes a range that can be safely converted into a View.

(note __ForwardingRange is the exposition-only concept defined in Range).

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http://en.cppreference.com/w/cpp/ranges/ViewableRange