On 27-Jul-12 22:58, Stuart wrote:
On Friday, 27 July 2012 at 16:15:46 UTC, Jesse Phillips wrote:
Taking a look at DirIteratorImpl[1] in std.file suggest there is a lot
of setup to navigate the filesystem on Windows. How does Yield help
with that logic?
Well, off the top of my head, you could use something like:
Public Iterator Function AllFiles(RootDirectory As String) As
IEnumerable(Of String)
Dim Roots As New Queue(Of String) From {RootDirectory}
While Roots.Any
Dim Root = Roots.Pop
Roots.AddRange(IO.Directory.GetDirectories(Root))
For Each Filename in IO.Directory.GetFiles(Root)
Yield Filename
Next
End While
End Function
Then it's not in anyway better then ranges. You again maintain stack (or
queue, whatever). The only difference is that for is replaced with a
function front/popFront that do one iteration of the same state machine.
--
Dmitry Olshansky
