[range.enumerate.overview] (original) (raw)

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.24 Enumerate view [range.enumerate]

25.7.24.1 Overview [range.enumerate.overview]

enumerate_view is a view whose elements represent both the position and value from a sequence of elements.

Given a subexpression E, the expression views​::​enumerate(E) is expression-equivalent toenumerate_view<views​::​all_t<decltype((E))>>(E).

[Example 1: vector<int> vec{ 1, 2, 3 };for (auto [index, value] : views::enumerate(vec)) cout << index << ":" << value << ' '; — _end example_]