std::span<T,Extent>::rbegin,std::span<T,Extent>::crbegin
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std::span
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span::rbeginspan::crbegin (C++23) | ||||
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constexpr reverse_iterator rbegin()constnoexcept; | (1) | (since C++20) |
constexpr const_reverse_iterator crbegin()constnoexcept; | (2) | (since C++23) |
Returns a reverse iterator to the first element of the reversed*this. It corresponds to the last element of the non-reversed*this.
If*this is empty, the returned iterator is equal torend().
Contents |
[edit]Return value
Reverse iterator to the first element.
[edit]Complexity
Constant.
[edit]Notes
Theunderlying iterator of the returned reverse iterator is theend 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(){constexprstd::span<constchar> code{"@droNE_T0P_w$s@s#_SECRET_a,p^42!"}; auto hack=[](constunsigned O){return O-0141<120;}; std::copy_if(code.rbegin(), code.rend(),std::ostream_iterator<constchar>(std::cout), hack); std::cout<<'\n';}
Output:
password
[edit]See also
(C++23) | returns a reverse iterator to the end (public member function)[edit] |
(C++14) | returns a reverse iterator to the beginning of a container or array (function template)[edit] |
