Re: pointers & handles

Subject: Re: pointers & handles
From: Michael Rohleder (michael.rohleder@motorola.com)
Date: Tue Jan 07 2003 - 14:45:24 PST

Andrzej,

I think you need to distinguish between the need for pointers to
 . permit the reference to arbitrary types
 . modify the actual value of a simulation object.
While I agree to the first bullet, Kevin and myself have some concerns about the second one.

When we would have a set of GetElement and PutElement functions to read and modify the
actual value of an element, then the remaining functionality could be exactly like with parameters
of a DirectC function.

-Michael

Andrzej Litwiniuk wrote:

> Kevin wrote:
> > I have no objection to individual implementations using pointers if they
> > can, however an interface that depends on it won't work in general.
>
> Why do you think so? What's wrong with the pointers?
>
> > If the interface is specified such that all calls can be macro-definintions
> > then it should work either way.
>
> > Indirect:
> >
> > #define svcGetArrElemPtr2(my_value,MyType,h,i,j)\
> > NSCsvGetArrElemPtr2(&(my_value), h, i, j);
>
> Kevin,
>
> The interface may provide functions for the predefined types
> (int, shortreal, etc.) or predefined classes of types (packed bit/logic arrays),
> but =not= for all the possible user-defined types!
>
> Although it is possible to generate an access function for each user defined
> type, such approach seems impractical.
> Therefore no simulator can provide a function "NSCsvGetArrElemPtr2"
> for your private type "MyType".
>
> I don't see how it could be possible to provide access to an array element of arbitrary a type without resorting to pointers, if a predefined library
> is to be used.
>
> > NB: Macro definitions generally don't take "..." arguments.
>
> Right. So, macros won't do the trick either, will they?
>
> Andrzej 

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