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

< cpp‎ | string‎ | basic string
(1)
reverse_iterator rend();
 (until C++11)
reverse_iterator rend() noexcept;
 (since C++11)
(until C++20)
constexpr reverse_iterator rend() noexcept;
 (since C++20)
(2)
const_reverse_iterator rend() const;
 (until C++11)
const_reverse_iterator rend() const noexcept;
 (since C++11)
(until C++20)
constexpr const_reverse_iterator rend() const noexcept;
 (since C++20)
(3)
const_reverse_iterator crend() const noexcept;
 (since C++11)
(until C++20)
constexpr const_reverse_iterator crend() const noexcept;
 (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.

range-rbegin-rend.svg

Parameters

(none)

Return value

reverse iterator to the character following the last character

Complexity

Constant

Example

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
 
int main()
{
  std::string s("A man, a plan, a canal: Panama");
  {
    std::string c;
    std::copy(s.rbegin(), s.rend(), std::back_inserter(c));
    std::cout << c <<'\n'; // "amanaP :lanac a ,nalp a ,nam A"
  }
 
  {
    std::string c;
    std::copy(s.crbegin(), s.crend(), std::back_inserter(c));
    std::cout << c <<'\n'; // "amanaP :lanac a ,nalp a ,nam A"
  }
}

Output:

amanaP :lanac a ,nalp a ,nam A
amanaP :lanac a ,nalp a ,nam A

See also

(C++11)
 returns a reverse iterator to the beginning
(public member function)
(C++17)
 returns a reverse iterator to the end
(public member function of std::basic_string_view<CharT,Traits>)