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[Caml-list] marshalling polymorphic variants
-
henri dubois-ferriere
- Basile Starynkevitch [local]
-
Richard Jones
-
Alex Baretta
- henri dubois-ferriere
-
Alex Baretta
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Date: | 2004-06-29 (21:54) |
From: | henri dubois-ferriere <henridf@g...> |
Subject: | Re: [Caml-list] marshalling polymorphic variants |
actually i'm not the kind who tries to subvert the type system ;) the scenario is as follows: an application saves state using some polymorphic variants. later the application has grown and adds more polymorphic variants to the 'vocabulary' of state it might read in. so, i wanted to be sure that the later application could still read the earlier variants in a safe manner. henri On Tue, 29 Jun 2004 19:50:28 +0200, Alex Baretta <alex@baretta.com> wrote: > > Richard Jones wrote: > > On Mon, Jun 28, 2004 at 11:02:25PM +0200, henri dubois-ferriere wrote: > > > >>hi, > >>in the simple case below, it is possible to marshal out a ([`A | `B] > >>list), and then read it back as a [> `A | `B | `C] list. > >> > >>can this behavior be counted on , or is it not something an > >>application can assume to always work? > > > > > > Better to use Obj.magic if you're explicitly trying to subvert the > > type system? > > > > Rich. > > > > It's better to use C if you are explicitly trying to subvert the type > system... > > Alex > > > > ------------------- > To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr > Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners