[Haskell-cafe] Problem binding GEGL library

Theodore Lief Gannon tanuki at gmail.com
Sun Jun 19 21:38:42 UTC 2016

I have no experience with the FFI, but conceptually that sounds like a
Traversable, not necessarily a Monad. I'd start small, with the simplest
superclass, Functor -- so, implement fmap, then move on from there.
On Jun 19, 2016 6:48 AM, "nek0" <nek0 at nek0.eu> wrote:

> Hello fellow haskellers,
> I am currently working on Haskell bindings to the GEGL [0] library.
> Since it's my first time working with the FFI and the whole idea of
> binding a library into Haskell, I have now run into a problem I can't
> resolve myself.
> The GEGL headers expose a function "gegl_buffer_iterator_new" which
> returns an iterator over a selected area in a buffer. This iterator
> contains a float pointer with pixel data. My problem is to make the
> iterator and the data it contains accessible to Haskell and to iterate
> over it.
> Can someone of you please help me with this problem? One of my initial
> thoughts was to wrap it into a monad, but I am totally inexperienced
> with that.
> My project can be found on my Github profile [1].
> Many thanks in advance,
> nek0
> links:
> [0]: http://www.gegl.org/
> [1]: https://github.com/nek0/gegl
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