std::map<Key,T,Compare,Allocator>::rend, std::map<Key,T,Compare,Allocator>::crend

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Containers library

node-handle (C++17)

Sequence

array (C++11)

vector

vector<bool>

inplace_vector (C++26)

hive (C++26)

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

mdspan (C++23)

Tables

Iterator invalidation

Member function table

Non-member function table

 

std::map

Member functions

map::map map::~map               map::operator= map::get_allocator

Element access map::at map::operator[] Iterators map::beginmap::cbegin (C++11) map::endmap::cend (C++11) map::rbeginmap::crbegin (C++11)      map::rendmap::crend (C++11) Capacity map::size map::max_size map::empty Observers map::key_comp map::value_comp Modifiers map::clear map::insert map::erase map::swap map::extract (C++17) map::merge (C++17) map::insert_range (C++23) map::insert_or_assign (C++17) map::emplace (C++11) map::emplace_hint (C++11) map::try_emplace (C++17) Lookup map::count map::find map::contains (C++20) map::equal_range map::lower_bound map::upper_bound

Non-member functions

operator==operator<=> (C++20) std::swap(std::map) erase_if(std::map) (C++20)   operator!=operator<operator>operator<=operator>= (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)

Deduction guides(C++17)

 

reverse_iterator rend();	(1)	(noexcept since C++11) (constexpr since C++26)
const_reverse_iterator rend()const;	(2)	(noexcept since C++11) (constexpr since C++26)
const_reverse_iterator crend()constnoexcept;	(3)	(since C++11) (constexpr since C++26)

Returns a reverse iterator past the last element of the reversed *this. It corresponds to the element preceding the first element of the non-reversed *this.

This returned iterator only acts as a sentinel. It is not guaranteed to be dereferenceable.

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>   usingnamespace std::chrono;   int main(){conststd::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

rbegincrbegin (C++11)	returns a reverse iterator to the beginning (public member function)
rendcrend (C++14)	returns a reverse end iterator for a container or array (function template)