[Haskell-cafe] Calling Haskell from other languages?

John Goerzen jgoerzen at complete.org
Tue Nov 11 14:31:06 EST 2008

On Tue, Nov 11, 2008 at 12:35:05PM -0600, Derek Elkins wrote:
> On Tue, 2008-11-11 at 17:09 +0000, Colin Paul Adams wrote:
> > >>>>> "Jake" == Jake Mcarthur <jake at pikewerks.com> writes:
> > 
> >     Jake> Actually, that's not the whole story. I didn't realize until
> >     Jake> I sent it. There does exist good documentation for this, I
> >     Jake> promise.
> > 
> > Good. Let me know where it is when you track it down.
> > 
> > The link you pointed me too doesn't seem to address my question
> > directly. Also, it only talks about C.
> > 
> > If I want to call Haskell (and I do, perhaps) from another
> > garbage-collected language (Eiffel, in particular) using C as the
> > mutually understood language, am I not going to run into big problems?
> Read the FFI Report.  It is relatively readable and comprehensive.
> http://www.cse.unsw.edu.au/~chak/haskell/ffi/
> And yes, you will have to use C as an intermediary, though you may not
> have to actually write any C.  You simply expose the Haskell functions
> in whatever form the other language expects.  You'll almost certainly
> have to write marshalling code of some sort.

I often like to look at these situations as an opportunity to
introduce modularity and piping.  Do you really need them running in
the same address space?

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