29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.12 Class recursive_­directory_­iterator [fs.class.rec.dir.itr] General [fs.class.rec.dir.itr.general]

An object of type recursive_­directory_­iterator provides an iterator for a sequence of directory_­entry elements representing the files in a directory or in an implementation-defined directory-like file type, and its sub-directories.
namespace std::filesystem { class recursive_directory_iterator { public: using iterator_category = input_iterator_tag; using value_type = directory_entry; using difference_type = ptrdiff_t; using pointer = const directory_entry*; using reference = const directory_entry&; // [fs.rec.dir.itr.members], constructors and destructor recursive_directory_iterator() noexcept; explicit recursive_directory_iterator(const path& p); recursive_directory_iterator(const path& p, directory_options options); recursive_directory_iterator(const path& p, directory_options options, error_code& ec); recursive_directory_iterator(const path& p, error_code& ec); recursive_directory_iterator(const recursive_directory_iterator& rhs); recursive_directory_iterator(recursive_directory_iterator&& rhs) noexcept; ~recursive_directory_iterator(); // [fs.rec.dir.itr.members], observers directory_options options() const; int depth() const; bool recursion_pending() const; const directory_entry& operator*() const; const directory_entry* operator->() const; // [fs.rec.dir.itr.members], modifiers recursive_directory_iterator& operator=(const recursive_directory_iterator& rhs); recursive_directory_iterator& operator=(recursive_directory_iterator&& rhs) noexcept; recursive_directory_iterator& operator++(); recursive_directory_iterator& increment(error_code& ec); void pop(); void pop(error_code& ec); void disable_recursion_pending(); // other members as required by [input.iterators], input iterators }; }
Calling options, depth, recursion_­pending, pop or disable_­recursion_­pending on an iterator that is not dereferenceable results in undefined behavior.
The behavior of a recursive_­directory_­iterator is the same as a directory_­iterator unless otherwise specified.
[Note 1:
If the directory structure being iterated over contains cycles then it is possible that the end iterator is unreachable.
— end note]