Difference between revisions of "cpp/container/span/rbegin"
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Latest revision as of 12:10, 20 November 2021
| constexpr reverse_iterator rbegin() const noexcept; |
(1) | (since C++20) |
| constexpr const_reverse_iterator crbegin() const noexcept; |
(2) | (since C++23) |
Returns a reverse iterator to the first element of the reversed span. It corresponds to the last element of the non-reversed span. If the span is empty, the returned iterator is equal to rend().
Contents |
[edit] Parameters
(none)
[edit] Return value
Reverse iterator to the first element.
[edit] Complexity
Constant.
[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.
[edit] Example
Run this code
#include <algorithm> #include <iostream> #include <iterator> #include <span> int main() { constexpr std::span<const char> code{"@droNE_T0P_w$s@s#_SECRET_a,p^42!"}; auto hack = [](const unsigned O) { return O - 0141 < 120; }; std::copy_if(code.rbegin(), code.rend(), std::ostream_iterator<const char>(std::cout), hack); std::cout << '\n'; }
Output:
password
[edit] See also
| (C++23) |
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) |
