std::flat_multimap<Key,T,Compare,KeyContainer,MappedContainer>::rbegin, std::flat_multimap<Key,T,Compare,KeyContainer,MappedContainer>::crbegin

Since C++23

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

# Declarations

reverse_iterator rbegin() noexcept;

(since C++23)

const_reverse_iterator rbegin() const noexcept;

(since C++23)

const_reverse_iterator crbegin() const noexcept;

(since C++23)

# Return value

Reverse iterator to the first element.

# Notes

The underlying iterator of the returned reverse iterator is the end iterator. Hence the returned iterator is invalidated if and when the end iterator is invalidated.

# Example

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

# See also