NAME¶

std::span::rbegin,std::span::crbegin - std::span::rbegin,std::span::crbegin

Synopsis¶

constexpr reverse_iterator rbegin() const noexcept; (1) (since C++20)
constexpr const_reverse_iterator crbegin() const noexcept; (2) (since C++23)

Returns a reverse iterator to the first element of the reversed span. It corresponds
to the last element of the non-reversed span. If the span is empty, the returned
iterator is equal to rend().

range-rbegin-rend.svg

Parameters¶

(none)

Return value¶

Reverse iterator to the first element.

Complexity¶

Constant.

Notes¶

The underlying iterator of the returned reverse iterator is the end iterator. Hence
the returned iterator is invalidated if and when the end iterator is invalidated.

Example¶

// Run this code

#include <algorithm>
#include <iostream>
#include <iterator>
#include <span>

int main()
{
constexpr std::span<const char> code{"@droNE_T0P_w$s@s#_SECRET_a,p^42!"};

auto hack = [](const unsigned O) { return O - 0141 < 120; };

std::copy_if(code.rbegin(), code.rend(),
std::ostream_iterator<const char>(std::cout), hack);

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

Output:¶

password

See also¶

rend returns a reverse iterator to the end
crend (public member function)
(C++23)
rbegin returns a reverse iterator to the beginning of a container or array
crbegin (function template)
(C++14)