Difference between revisions of "cpp/container/map/rend"
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Latest revision as of 02:15, 16 September 2020
| reverse_iterator rend(); |
(1) | (noexcept since C++11) |
| const_reverse_iterator rend() const; |
(2) | (noexcept since C++11) |
| const_reverse_iterator crend() const noexcept; |
(3) | (since C++11) |
Returns a reverse iterator to the element following the last element of the reversed map. It corresponds to the element preceding the first element of the non-reversed map. This element acts as a placeholder, attempting to access it results in undefined behavior.
Contents |
[edit] Parameters
(none)
[edit] Return value
Reverse iterator to the element following the last element.
[edit] Complexity
Constant.
Notes
libc++ backports crend() to C++98 mode.
[edit] Example
Run this code
#include <chrono> #include <iomanip> #include <iostream> #include <string_view> #include <map> using namespace std::chrono; int main() { const std::map<year_month_day, int> messages { {February/17/2023, 10}, {February/17/2023, 20}, {February/16/2022, 30}, {October/22/2022, 40}, {June/14/2022, 50}, {November/23/2021, 60}, {December/10/2022, 55}, {December/12/2021, 45}, {April/1/2020, 42}, {April/1/2020, 24} }; std::cout << "Messages received (date order is reversed):\n"; for (auto it = messages.crbegin(); it != messages.crend(); ++it) std::cout << it->first << " : " << it->second << '\n'; }
Possible output:
Messages received (date order is reversed): 2023-02-17 : 10 2022-12-10 : 55 2022-10-22 : 40 2022-06-14 : 50 2022-02-16 : 30 2021-12-12 : 45 2021-11-23 : 60 2020-04-01 : 42
[edit] See also
| (C++11) |
returns a reverse iterator to the beginning (public member function) |
| (C++14) |
returns a reverse end iterator for a container or array (function template) |
