From: Kent Dahl <kentda@...>
Date: 2003-06-25T22:00:22+09:00
Subject: Re: protect parents from children

Simon Strandgaard wrote:
> 
> On Wed, 25 Jun 2003 13:29:31 +0000, Martin DeMello wrote:
> 
> > Simon Strandgaard <0bz63fz3m1qt3001@sneakemail.com> wrote:
> >> In C++ private members is inacessable to derivatived classes.
> >> I want the same, but with a extra twist.
> >> Instances declared in the parent should be readonly(frozen) to the
> >> subclass.
> >>
> >> So that the subclass (B):
> >> *  is allowed to read the variable.
> >> *  is disallowed to write to the variable (raise exception).
> >
> > Offhand, I'd say it wasn't even hackable in pure ruby, because
> 
> [snip]
> 
> I am sad to hear that. Then I have to learn to live without protection.
> Thanks Guy+Martin for the discussion it has been educational.
> 
> BTW: Perhaps it could be nice if you could say:
> 
> class A
>   def initialize
>     @value = [1, 2, 3]
>   end
>   subclass_freeze :value      # maybe nice to have ?
> end
> 
> --
> Simon Strandgaard

-- 
(\[ Kent Dahl ]/)_    _~_    _____[ http://www.pvv.org/~kentda/ ]_____/~
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