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/C++std::array<T,N>::rbegin, std::array<T,N>::crbegin
| (1) | ||
reverse_iterator rbegin() noexcept; | (until C++17) | |
constexpr reverse_iterator rbegin() noexcept; | (since C++17) | |
| (2) | ||
const_reverse_iterator rbegin() const noexcept; | (until C++17) | |
constexpr const_reverse_iterator rbegin() const noexcept; | (since C++17) | |
| (3) | ||
const_reverse_iterator crbegin() const noexcept; | (until C++17) | |
constexpr const_reverse_iterator crbegin() const noexcept; | (since C++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.
Example
#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
|
(C++11) | returns a reverse iterator to the end (public member function) |
|
(C++14) | returns a reverse iterator to the beginning of a container or array (function template) |
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