[range.as.rvalue.overview] (original) (raw)

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.7 As rvalue view [range.as.rvalue]

25.7.7.1 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 an as_rvalue_viewto replace copying with moving.

Let E be an expression and let T be decltype((E)).

The expression views​::​as_rvalue(E) is expression-equivalent to:

• views​::​all(E) ifT models input_range andsame_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)); — _end example_]