[Haskell-cafe] lazily traversing a foreign data structure

[Graham Fawcett]

On 10/25/07, Derek Elkins <derek.a.elkins at gmail.com> wrote:
> On Thu, 2007-10-25 at 11:30 -0400, Graham Fawcett wrote:
> > I'm writing a Gnu DBM module as an exercise for learning Haskell and
> > its FFI. I'm wondering how I might write a function that returns the
> > database keys as a lazy list. I've wrapped the two relevant foreign
> > functions:
> Just use unsafeInterleaveIO in the obvious definition to read all the
> keys.  That said, it's not called unsafeInterleaveIO for no reason.


Ah thanks, that's just the thing. Safety warnings duly noted.

Graham