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Wrapping OCaml function returning a variant
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Date: -- (:)
From: Joel Reymont <joelr1@g...>
Subject: Re: [Caml-list] Wrapping OCaml function returning a variant

On Mar 28, 2007, at 1:55 PM, Serge Aleynikov wrote:

> You can read the section 18.3.4 of http://caml.inria.fr/pub/docs/ 
> manual-ocaml/manual032.html

It does not clearly explain how to handle variant types in C code.  
Maybe I'm dumb but I did not understand it.

> Then if still unclear, examine: http://oracaml.sourceforge.net/
> or any other C-interface library available on Caml Hump: http:// 
> caml.inria.fr/cgi-bin/hump.en.cgi?sort=0&browse=65

It looks like you are using polymorphic variants in new syntax. Maybe  
I'm wrong but it doesn't work for me

# type foo = [Null | Int of int];;
Syntax error

I still don't understand how I can handle regular variants of the  
following type returned by OCaml to the C side

> type morpher_output =
>   | Success of string
>   | Error of string * int * int * int

	Thanks, Joel

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