This class offers a forward-only const_iterator, that matches the system
low-level functions' logic (e.g. readdir()/dirstream logic). This
iterator is a std::input_iterator_tag.
QDirIterator uses Java-style iterators that have a couple of issues:
- They don't fit the logic of the underlying native system functions
(readdir()/__dirstream and co.), there is no way to know if there is a
next entry except by advancing the iterator (calling readdir()) first
- As a consequence of the above, two QFileInfo objects, current and next,
had to be used to fit that paradigm; and the code always
iterated/stat'ed an extra entry past the one we want, e.g. when
filtering
The next step is porting QAbstractFileEngineIterator and its subclasses
to be like QFileSystemIterator, i.e. replace hasNext()/next() with a `bool
advance()` virtual method. This is easier to reason about than the
Java-style iterators, and is more in-line with the new class.
Discussed-on: https://lists.qt-project.org/pipermail/development/2023-December/044745.html
Change-Id: I8e696cefdca18d8c78f803efdb83a73dd43eb720
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
c39a0d1e89