24 Ranges library [ranges]

24.7 Range adaptors [range.adaptors]

24.7.7 Transform view [range.transform]

24.7.7.1 Overview [range.transform.overview]

transform_­view presents a view of an underlying sequence after applying a transformation function to each element.
The name views​::​transform denotes a range adaptor object ([range.adaptor.object]).
Given subexpressions E and F, the expression views​::​transform(E, F) is expression-equivalent to transform_­view(E, F).
[Example 1: vector<int> is{ 0, 1, 2, 3, 4 }; auto squares = views::transform(is, [](int i) { return i * i; }); for (int i : squares) cout << i << ' '; // prints: 0 1 4 9 16 — end example]