std::basic_string<CharT,Traits,Allocator>::rend, std::basic_string<CharT,Traits,Allocator>::crend

reverse_iterator rend();	(1)	(noexcept since C++11) (constexpr since C++20)
const_reverse_iterator rend() const;	(2)	(noexcept since C++11) (constexpr since C++20)
const_reverse_iterator crend() const noexcept;	(3)	(since C++11) (constexpr since C++20)

Returns a reverse iterator to the character following the last character of the reversed string. It corresponds to the character preceding the first character of the non-reversed string. This character acts as a placeholder, attempting to access it results in undefined behavior.

Parameters

(none)

Return value

Reverse iterator to the character following the last character.

Complexity

Constant.

Notes

libc++ backports crend() to C++98 mode.

Example

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>

int main()
{
    std::string p("[A man, a plan, a canal: Panama]");
    std::string q;

    std::copy(p.crbegin(), p.crend(), std::back_inserter(q));
    std::cout << "q = " << q << '\n';

    std::copy(q.crbegin(), q.crend(), p.rbegin());
    std::cout << "p = " << p << '\n';
}

Output:

q = ]amanaP :lanac a ,nalp a ,nam A[
p = ]amanaP :lanac a ,nalp a ,nam A[