string::rbegin
Return a reverse iterator to the first character of the reversed container.
Synopsis
string::reverse_iterator
rbegin() noexcept; (1)
string::const_reverse_iterator
rbegin() const noexcept; (2)Description
Returns the pointed-to character that corresponds to the last character of the non-reversed container. If the container is empty, rend() is returned.
Complexity
Constant.
Exception Safety
No-throw guarantee.