31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.11 Class directory_iterator [fs.class.directory.iterator]

31.12.11.3 Non-member functions [fs.dir.itr.nonmembers]

These functions enable range access for directory_iterator.
directory_iterator begin(directory_iterator iter) noexcept;
Returns: iter.
directory_iterator end(directory_iterator) noexcept;
Returns: directory_iterator().