From: Vincent Aravantinos <vincent.aravantinos@gmail.com>
To: Dario Teixeira <darioteixeira@yahoo.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Structural subtyping problem
Date: Sun, 28 Mar 2010 19:03:08 +0200 [thread overview]
Message-ID: <49DFC32A-514B-4C2F-A871-4A4BDFE0E7DC@gmail.com> (raw)
In-Reply-To: <61102.44294.qm@web111503.mail.gq1.yahoo.com>
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Hi, the following seems to do the trick (?) :
Le 28 mars 10 à 18:38, Dario Teixeira a écrit :
> let rec step1 ?story () = match story with
> | Some s -> step2 s#title
> | None -> step2 "title1"
>
>
> and step2 title =
> let story =
> object
> method title = title
> method count = 0
> end
> in step3 ~story
>
>
> and step3 ~story = match story#count with
> | 0 ->
>>
- step1 ~story ()
+ step1 ~story:(story :> <title : string>) ()
> | 1 ->
> let story =
> object
> method title = "title2"
> end
> in step1 ~story ()
> | _ ->
> true
Cheers,
--
Vincent Aravantinos - PhD Student - Laboratory of Informatics of
Grenoble
http://membres-lig.imag.fr/aravantinos/
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next prev parent reply other threads:[~2010-03-28 17:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-28 16:38 Dario Teixeira
2010-03-28 17:03 ` Vincent Aravantinos [this message]
2010-03-28 17:07 ` [Caml-list] " Andreas Rossberg
2010-03-28 17:32 ` Stéphane Glondu
2010-03-28 19:20 ` Christophe TROESTLER
2010-03-28 20:17 ` Dario Teixeira
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