[Grace-core] NS inheritance cannot work for grace

[Richard Roberts]

>
> If I understand this right, this means that you would evaluate the inherit
> expression in the same way as in a normal request.


Yes, my intention was to see if we could treat inheritance expressions as
normal requests - as you indicated doing so leads to double initialization
and, consequently, perhaps unexpected side effects. Lesson learned :)

On Wed, Jan 10, 2018 at 9:59 AM, Prof. Andrew P. Black <black at cs.pdx.edu>
wrote:

> Dear Richard,
>
> I think that the flaw in your translation is here:
>
>
> > On 29 Nov 2017, at 11:29 , Richard Roberts <rykardo.r at gmail.com> wrote:
> >
>
> > if no inherit expression declared,
> >     1 - make a fresh object
> > else
> >     1 - call inherit expression (if found).
> >        1.1 invoke the request declared in the inheritance clause
> >        1.2 assign the object to self.
>
>
> If I understand this right, this means that you would evaluate the inherit
> expression in the same way as in a normal request.  This includes executing
> the initialization, which might execute methods that will be overridden by
> traits or by new definitions in the object constructor.
>
> Then, in step 3 you execute the initialization again, this time with the
> correct overriding.  This might overwrite any bad initialization done by
> the earlier initialization, but since the initialization code can have
> arbitrary effects (like, for example, printing stuff), the double
> initialization would be visible.
>
>         Andrew
>
>
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