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std::ranges::elements_view::iterator::operator*(3) C++ Standard Libary std::ranges::elements_view::iterator::operator*(3)

NAME

std::ranges::elements_view::iterator::operator* - std::ranges::elements_view::iterator::operator*

Synopsis


constexpr decltype(auto) operator*() const; (since C++20)


Returns the element into V the underlying iterator points to.


Effectively returns /*get-element*/(this->base()), 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


(none)

Return value


The current element.

Notes


operator-> is not provided.

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"},
};


const auto view {il | std::views::elements<2>};


const auto iter {view.begin() + 1};


std::cout << *iter << '\n';
}

Output:


β

See also


operator[] accesses an element by index
(C++20) (public member function)

2024.06.10 http://cppreference.com