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Re: Is there any approach to define "private" vars in GOOPS?

From: nalaginrut
Subject: Re: Is there any approach to define "private" vars in GOOPS?
Date: Wed, 09 Mar 2011 17:27:25 +0800

> 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?

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