std::ranges::elements_view<V,N>:: elements_view

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C++
Ranges library
Range adaptors
std::ranges::elements_view
Member functions
elements_view::elements_view
Nested classes
Iterator
Sentinel
elements_view ( ) requires std:: default_initializable < V > = default ;
(1) (since C++20)
constexpr explicit elements_view ( V base ) ;
(2) (since C++20)

Constructs an elements_view .

1) Default constructor. Value-initializes the underlying view base_ . After construction, base() returns a copy of V ( ) .
2) Initializes the underlying view base_ with std :: move ( base ) .

Parameters

base - the underlying view

Example

Run this code 
#include <array>
#include <iostream>
#include <ranges>
#include <tuple>
 
void println(auto const& v)
{
    for (auto const& e : v)
        std::cout << e << ' ';
    std::cout << '\n';
}
 
int main()
{
    using namespace std::literals;
 
    const std::array<std::tuple<int, char, std::string>, 2> vt
    {
        std::tuple{1, 'A', "α"s},
        std::tuple{2, 'B', "β"s},
    };
 
    [[maybe_unused]]
    auto empty = std::views::elements<0>;
 
    println(std::views::elements<0>(vt));
    println(std::views::elements<1>(vt));
    println(std::views::elements<2>(vt));
}

Output: 

1 2
A B
α β
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