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

From cppreference.com
< cpp‎ | container‎ | multimap

 
 
Containers library
Sequence
(C++11)
Associative
Unordered associative
Adaptors
Views
(C++20)
 
 
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().

range-rbegin-rend.svg

Parameters

(none)

Return value

Reverse iterator to the first element.

Complexity

Constant.


Example

#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

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