26 Ranges library [ranges]

26.7 Range adaptors [range.adaptors]

26.7.7 As rvalue view [range.as.rvalue]

26.7.7.1 Overview [range.as.rvalue.overview]

as_­rvalue_­view presents a view of an underlying sequence with the same behavior as the underlying sequence except that its elements are rvalues.
Some generic algorithms can be called with a as_­rvalue_­view to replace copying with moving.
The name views​::​as_­rvalue denotes a range adaptor object ([range.adaptor.object]).
Let E be an expression and let T be decltype((E)).
The expression views​::​as_­rvalue(E) is expression-equivalent to:
  • views​::​all(E) if same_­as<range_­rvalue_­reference_­t<T>, range_­reference_­t<T>> is true.
  • Otherwise, as_­rvalue_­view(E).
[Example 1: vector<string> words = {"the", "quick", "brown", "fox", "ate", "a", "pterodactyl"}; vector<string> new_words; ranges::copy(words | views::as_rvalue, back_inserter(new_words)); // moves each string from words into new_­words — end example]