From cppreference.com
reverse_iteratorrend()noexcept; (1) (since C++23)const_reverse_iteratorrend()constnoexcept; (2) (since C++23)const_reverse_iteratorcrend()constnoexcept; (3) (since C++23)Returns a reverse iterator to the element following the last element of the reversed flat_set. It corresponds to the element preceding the first element of the non-reversed flat_set. This element acts as a placeholder, attempting to access it results in undefined behavior.
Return value
Reverse iterator to the element following the last element.
Complexity
Constant.
Notes
Because both iterator and const_iterator are constant iterators (and may in fact be the same type), it is not possible to mutate the elements of the container through an iterator returned by any of these member functions.
Example
Run this code
#include<iostream>#include<flat_set>intmain(){std::flat_set<unsigned>rep{1,2,3,4,1,2,3,4};for(autoit=rep.crbegin();it!=rep.crend();++it){for(auton=*it;n>0;--n)std::cout<<"⏼"<<' ';std::cout<<'\n';}}Output:
⏼ ⏼ ⏼ ⏼ ⏼ ⏼ ⏼ ⏼ ⏼ ⏼ See also
returns a reverse iterator to the beginning
(public member function)
(C++14)
returns a reverse end iterator for a container or array
(function template)