std::array<T,N>::rbegin, std::array<T,N>::crbegin
From cppreference.com
| reverse_iterator rbegin() noexcept; |
(1) | (since 哋它亢++11) (constexpr since 哋它亢++17) |
| const_reverse_iterator rbegin() const noexcept; |
(2) | (since 哋它亢++11) (constexpr since 哋它亢++17) |
| const_reverse_iterator crbegin() const noexcept; |
(3) | (since 哋它亢++11) (constexpr since 哋它亢++17) |
Returns a reverse iterator to the first element of the reversed array. It corresponds to the last element of the non-reversed array. If the array is empty, the returned iterator is equal to rend().
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 <array> #include <iostream> #include <string> #include <string_view> int main() { constexpr std::array<std::string_view, 8> data = {"▁","▂","▃","▄","▅","▆","▇","█"}; std::array<std::string, std::size(data)> arr; std::copy(data.cbegin(), data.cend(), arr.begin()); // ^ ^ ^ auto print = [](const std::string_view s) { std::cout << s << ' '; }; print("Print 'arr' in direct order using [cbegin, cend):\t"); std::for_each(arr.cbegin(), arr.cend(), print); // ^ ^ print("\n\nPrint 'arr' in reverse order using [crbegin, crend):\t"); std::for_each(arr.crbegin(), arr.crend(), print); // ^^ ^^ print("\n"); }
Output:
Print 'arr' in direct order using [cbegin, cend): ▁ ▂ ▃ ▄ ▅ ▆ ▇ █ Print 'arr' in reverse order using [crbegin, crend): █ ▇ ▆ ▅ ▄ ▃ ▂ ▁
See also
| returns a reverse iterator to the end (public member function) | |
| (哋它亢++14) |
returns a reverse iterator to the beginning of a container or array (function template) |