Re: Sugestion to Multiple Inheritance

[Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>]

lutz@iks-jena.de (Lutz Donnerhacke) writes:

> * Stephen Leake wrote:
> >lutz@iks-jena.de (Lutz Donnerhacke) writes:
> >> * Stephen Leake wrote:
> >> >lutz@iks-jena.de (Lutz Donnerhacke) writes:
> >> >>      A -> B     B is an extended A and C is an extended A.
> >> >>      |    |     D combines both extensions (requiring both).
> >> >>      v    v
> >> >>      C -> D
> >> >
> >> >I need more information about why C and B need to be independent types.
> >> 
> >> They do not need to be types at all. They are abstactions => interfaces.
> >> Example: A describes a sort algorithm. B describes stableness. C describes
> >> in-place-ness. D describes stable, in-place sort algorithms.
> >
> >Well, if they don't have to be types, you can easily do it in Ada. But
> >all your complaints were that it could not be done with abstract Ada
> >types.
> 
> I'm sorry for providing my solutions in the same posting asking for hints.
> How can this be done easily?

Just write packages A, B, C, D, with appropriate subprogram
declarations in the spec, and appropriate comments saying what they
do. Then in the body of D, call the subprograms in B and C as
appropriate.

The Ada code will _not_ describe the inheritance structure, except in
the comments. Perhaps that is why you don't want to do this.

-- 
-- Stephe