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

Since C++11

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.

# Declarations

reverse_iterator rend();

(noexcept since C++11) (constexpr since C++20)

const_reverse_iterator rend() const;

(noexcept since C++11) (constexpr since C++20)

const_reverse_iterator crend() const noexcept;

(since C++11) (constexpr since C++20)

# Return value

Reverse iterator to the character following the last character.

# 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';
}