std::ranges::elements_view<V,N>::elements_view
elements_view() requires std::default_initializable<V> = default; |
(1) | (since C++20) |
constexpr 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(r)
.
Parameters
base | - | the underlying view |
Example
#include <iostream> #include <ranges> #include <tuple> #include <array> using namespace std::literals; int main() { 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>; auto ev0 = std::views::elements<0>(vt); auto ev1 = std::views::elements<1>(vt); auto ev2 = std::views::elements<2>(vt); for (auto const& e: ev0) { std::cout << e << ' '; } std::cout << '\n'; for (auto const& e: ev1) { std::cout << e << ' '; } std::cout << '\n'; for (auto const& e: ev2) { std::cout << e << ' '; } std::cout << '\n'; }
Output:
1 2 A B α β
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