Re: Is the Writing on the Wall for Ada?

["Robert I. Eachus" <rieachus@attbi.com>]

Dmitry A. Kazakov wrote:

> MII suffers same problems as full MI. When you add an interface it may
> conflict with other interfaces. Adding an interface several times you
> have the diamond problem: whether same interfaces are mapped to one
> interface of the new type or to different cloned interfaces.

The current write-up deals with the diamond problem as follows:

If you inherit operations from two types with the signature, if one is 
from the (direct) parent, that is the one used.  If the two are from 
different interfaces, then calling that operation is ambiguous.

So you can get around the diamond problem by directly inheriting from 
one interface and only inheriting the interface of the other.  Yes, it 
isn't perfect, but there is one full solution to the problem.  (With 
mix-ins, the order of inheritance determines which operation is visible 
for the final type, but you can alway either use renaming to make the 
hidden operation visible, or call it directly using type conversions.)

-- 
                                            Robert I. Eachus

"As far as I'm concerned, war always means failure." -- Jacques Chirac, 
President of France
"As far as France is concerned, you're right." -- Rush Limbaugh