[fs.path.itr]

A path::iterator is a constant iterator meeting all the requirements of a bidirectional iterator except that, for dereferenceable iterators a and b of type path::iterator with a == b, there is no requirement that *a and *b are bound to the same object.

Its value_type is path.

Calling any non-const member function of a path object invalidates all iterators referring to elements of that object.

For the elements of the pathname in the generic format, the forward traversal order is as follows:

(4.1)
The root-name element, if present.
(4.2)
The root-directory element, if present.

[Note 1:
It is possible that the use of the generic format is needed to ensure correct lexicographical comparison.
— end note]
(4.3)
Each successive filename element, if present.
(4.4)
An empty element, if a trailing non-root directory-separator is present.

The backward traversal order is the reverse of forward traversal.

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iterator begin() const;

Returns: An iterator for the first present element in the traversal list above.

If no elements are present, the end iterator.

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iterator end() const;

Returns: The end iterator.