Re: [Haskell-cafe] Calling Haskell from other languages?

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:

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> "Jake" == Jake Mcarthur 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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