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

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< cpp‎ | ranges‎ | elements view‎ | iterator

constexpr decltype(auto) operator[]( difference_type n ) const requires ranges::random_access_range<Base>; |  | (since C++20)

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

n | - | position relative to current location

### Return value

The element at displacement n relative to the current location.

### Example

Run this code

    #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
    }

Output:

    2 B β

### See also

operator* (C++20) | accesses the `N`th tuple element (public member function)

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