Namespaces
Variants
Views
Actions

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

From cppreference.com
 
 
Ranges library
Range access
Range conversions
(C++23)

Range primitives



Dangling iterator handling
Range concepts
Views

Range factories
Range adaptors
Range generators
Range adaptor objects
Range adaptor closure objects
Helper items
(until C++23)(C++23)


 
 
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. After construction, base() returns a copy of V().
2) Initializes the underlying view with std::move(base).

[edit] Parameters

base - the underlying view

[edit] Example

#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