std::multimap<Key,T,Compare,Allocator>::rbegin, std::multimap<Key,T,Compare,Allocator>::crbegin

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

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

Views

span (C++20)

 

std::multimap

Member functions

multimap::multimap

multimap::~multimap

multimap::operator=

multimap::get_allocator

Iterators

multimap::beginmultimap::cbegin (C++11)

multimap::endmultimap::cend (C++11)

multimap::rbeginmultimap::crbegin (C++11)

multimap::rendmultimap::crend (C++11)

Capacity

multimap::empty

multimap::size

multimap::max_size

Modifiers

multimap::clear

multimap::insert

multimap::emplace (C++11)

multimap::emplace_hint (C++11)

multimap::erase

multimap::swap

multimap::extract (C++17)

multimap::merge (C++17)

Lookup

multimap::count

multimap::find

multimap::contains (C++20)

multimap::equal_range

multimap::lower_bound

multimap::upper_bound

Observers

multimap::key_comp

multimap::value_comp

Non-member functions

std::swap

erase_if (C++20)

operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Deduction guides(C++17)

 

reverse_iterator rbegin();		(until C++11)
reverse_iterator rbegin() noexcept;		(since C++11)
const_reverse_iterator rbegin() const;		(until C++11)
const_reverse_iterator rbegin() const noexcept;		(since C++11)
const_reverse_iterator crbegin() const noexcept;		(since C++11)

Returns a reverse iterator to the first element of the reversed multimap. It corresponds to the last element of the non-reversed multimap. If the multimap is empty, the returned iterator is equal to rend().

Parameters

(none)

Return value

Reverse iterator to the first element.

Complexity

Constant.

Example

Run this code

#include <algorithm>
#include <iostream>
#include <map>
#include <string>
 
int main()
{
    std::multimap<std::string, int> multimap {
        { "█", 1 },
        { "▒", 5 },
        { "░", 3 },
        { "▓", 7 },
        { "▓", 8 },
        { "░", 4 },
        { "▒", 6 },
        { "█", 2 },
    };
 
    std::cout << "Print out in reverse order using const reverse iterators:\n";
    std::for_each(multimap.crbegin(), multimap.crend(),
        [](std::pair<const std::string, int> const& e) {
            std::cout << "{ \"" << e.first << "\", " << e.second << " };\n";
        });
 
    multimap.rbegin()->second = 42; // OK: non-const value is modifiable
//  multimap.crbegin()->second = 42; // Error: can't modify the const value
}

Possible output:

Print out in reverse order using const reverse iterators:
{ "▓", 8 };
{ "▓", 7 };
{ "▒", 6 };
{ "▒", 5 };
{ "░", 4 };
{ "░", 3 };
{ "█", 2 };
{ "█", 1 };

See also

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