std::ranges::adjacent_view<V,N>:: iterator <Const>:: operator[]

Returns an element at specified relative location.

Let current_ be an underlying array of iterators.

Equivalent to:

return /*tuple-transform*/([&](auto& i) -> decltype(auto) { return i[n]; }, current_);

Parameters

Return value

The element at displacement n relative to the current location.

Example

#include <ranges>
#include <tuple>
 
int main()
{
    constexpr static auto v = {0, 1, 2, 3, 4, 5};
    //                               └──┬──┘  
    //                                  └─────────────────┐
    constexpr auto view = v | std::views::adjacent<3>; // │
    //                 ┌───────────────────┬──────────────┘ 
    //                 │                ┌──┴──┐
    static_assert(view[2] == std::tuple{2, 3, 4});
}