25 Ranges library [ranges]

25.6 Range factories [range.factories]

25.6.6 Istream view [range.istream]

25.6.6.1 Overview [range.istream.overview]

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basic_istream_view models input_range and reads (using operator>>) successive elements from its corresponding input stream.
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The name views​::​istream<T> denotes a customization point object ([customization.point.object]).
Given a type T and a subexpression E of type U, if U models derived_from<basic_istream<typename U​::​char_type, typename U​::​traits_type>>, then the expression views​::​istream<T>(E) is expression-equivalent to basic_istream_view<T, typename U​::​char_type, typename U​::​traits_type>(E); otherwise, views​::​istream<T>(E) is ill-formed.
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[Example 1: auto ints = istringstream{"0 1 2 3 4"}; ranges::copy(views::istream<int>(ints), ostream_iterator<int>{cout, "-"}); // prints 0-1-2-3-4- — end example]