std::flat_multimap::rbegin,(3)

NAME
std::flat_multimap::rbegin, - std::flat_multimap::rbegin,

Synopsis
   reverse_iterator rbegin() noexcept; (1) (since C++23)
   const_reverse_iterator rbegin() const noexcept; (2) (since C++23)
   const_reverse_iterator crbegin() const noexcept; (3) (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().
   range-rbegin-rend.svg

Parameters
   (none)

Return value
   Reverse iterator to the first element.

Complexity
   Constant.

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
// Run this code
 #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
 }

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

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