NAME¶

std::map::rend,std::map::crend - std::map::rend,std::map::crend

Synopsis¶

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

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

range-rbegin-rend.svg

Parameters¶

(none)

Return value¶

Reverse iterator to the element following the last element.

Complexity¶

Constant.

Notes¶

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

Example¶

// Run this code

#include <chrono>
#include <iomanip>
#include <iostream>
#include <string_view>
#include <map>

using namespace std::chrono;

int main()
{
const std::map<year_month_day, int> messages
{
{February/17/2023, 10},
{February/17/2023, 20},
{February/16/2022, 30},
{October/22/2022, 40},
{June/14/2022, 50},
{November/23/2021, 60},
{December/10/2022, 55},
{December/12/2021, 45},
{April/1/2020, 42},
{April/1/2020, 24}
};

std::cout << "Messages received (date order is reversed):\n";
for (auto it = messages.crbegin(); it != messages.crend(); ++it)
std::cout << it->first << " : " << it->second << '\n';
}

Possible output:¶

Messages received (date order is reversed):
2023-02-17 : 10
2022-12-10 : 55
2022-10-22 : 40
2022-06-14 : 50
2022-02-16 : 30
2021-12-12 : 45
2021-11-23 : 60
2020-04-01 : 42

See also¶

rbegin returns a reverse iterator to the beginning
crbegin (public member function)
(C++11)
rend returns a reverse end iterator for a container or array
crend (function template)
(C++14)