std::ranges::elements_view<V,F>:: iterator <Const>:: operator[]

Returns an element at specified relative location, as if by /*get-element*/ ( this - > base ( ) + n ) , where for an expression e , /*get-element*/ ( e ) is

• std :: get < N > ( * e ) , if ranges:: range_reference_t < Base > is a reference type. Otherwise,
• static_cast < E > ( std :: get < N > ( * e ) ) , where E is std:: remove_cv_t < std:: tuple_element_t < N, ranges:: range_reference_t < Base >>> .

Parameters

Return value

The element at displacement n relative to the current location.

Example

#include <iostream>
#include <ranges>
#include <string_view>
#include <tuple>
 
int main()
{
    using T = std::tuple<int, char, std::string_view>;
 
    const auto il =
    {
        T{1, 'A', "α"},
        T{2, 'B', "β"},
        T{3, 'C', "γ"},
    };
 
    std::cout << std::views::elements<0>(il)[1] << ' '   // 2
              << std::views::elements<1>(il)[1] << ' '   // B
              << std::views::elements<2>(il)[1] << '\n'; // β
}

2 B β

See also