From: nalaginrut <nalaginrut@gmail.com>
To: Neil Jerram <neil@ossau.uklinux.net>
Cc: Guile <guile-user@gnu.org>
Subject: Re: Is there any approach to define "private" vars in GOOPS?
Date: Wed, 09 Mar 2011 17:37:03 +0800 [thread overview]
Message-ID: <1299663423.2577.86.camel@Renee-desktop> (raw)
In-Reply-To: <1299662845.2577.82.camel@Renee-desktop>
> > If you can determine at runtime whether or not any given slot access is
> > allowed - perhaps based on (current-module) - it should be possible to
> > enforce this by defining a new kind of slot #:allocation and putting
> > that runtime check in the #:slot-ref function.
> >
> > Regards,
> > Neil
>
> Thanks for your answer :-)
> But I think a new kind of slot allocation seems not easy.
> For example. If I got a class "player", and assume we've already defined
> a new kind allocation, say, #:allocation #:private.
> ===============================
> (define-class <player> ()
> ......
> (score #:init-value 0 #:allocation #:private)
> ......)
> =====
> I don't want somebody change "score" except calling a method to compute
> his real score.
> And I have a method to update player's score:
> =====
> (define-method (score-update (player <player>))
> ...
> (slot-set! (slot-ref player 'score) newscore)
> ... )
> ========================
> The problem is how to check the scope of "score" from "score-update".
> I've no idea because the definition of "score-update" is actually out of
> the class definition.
>
> Can I get some advice about the topic "how to hide the critical
> property"? Or maybe I have some misunderstandings?
>
Sorry I think the "update score" is a fake problem. It can be solved by
#:allocation #:virtual.
But I still want to talk this topic: "How to hide the critical
property?"
--
GNU Powered it
GPL Protected it
GOD Blessed it
HFG - NalaGinrut
next prev parent reply other threads:[~2011-03-09 9:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 2:37 Is there any approach to define "private" vars in GOOPS? nalaginrut
2011-03-09 8:46 ` Neil Jerram
2011-03-09 9:27 ` nalaginrut
2011-03-09 9:37 ` nalaginrut [this message]
2011-03-09 22:19 ` Andy Wingo
2011-04-01 22:55 ` Neil Jerram
2011-03-09 9:46 ` Mark H Weaver
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