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

< cpp‎ | container‎ | map
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;
(3) (since C++11)

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



[edit] Parameters


[edit] Return value

Reverse iterator to the first element.

[edit] Complexity


[edit] 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.

libc++ backports crbegin() to C++98 mode.

[edit] Example

#include <iomanip>
#include <iostream>
#include <string_view>
#include <map>
int main()
    const std::map<int, std::string_view> coins
        {10, "dime"},
        {100, "dollar"},
        {50, "half dollar"},
        {5, "nickel"},
        {1, "penny"},
        {25, "quarter"}
    }; // initializer entries in name alphabetical order
    std::cout << "US coins in circulation, largest to smallest denomination:\n";
    for (auto it = coins.crbegin(); it != coins.crend(); ++it)
        std::cout << std::setw(11) << it->second << " = ¢" << it->first << '\n';


US coins in circulation, largest to smallest denomination:
     dollar = ¢100
half dollar = ¢50
    quarter = ¢25
       dime = ¢10
     nickel = ¢5
      penny = ¢1

[edit] See also

returns a reverse iterator to the end
(public member function) [edit]
returns a reverse iterator to the beginning of a container or array
(function template) [edit]