Re: the 'Extends' clause

["Andreas Polyrakis" <apolyr@cs.toronto.edu>]

So, if I got it right, you suggest that I should use EXTENDS to define the
PIB,
but apart from it, I must also specify in the PIB draft that PRIs of class A
cannot
be installed without also installing a PRI either in B or C...

thank you very much for your prompt answer!

Andreas


> Andreas,
>
> What you are specifying here, is using class A as an abstract class which
> cannot
> be instantiated by itself. You can't specify this by using the EXTENDS
> clause, but you could force this relationship at the implementation level,
> i.e an
> instance of A cannot be received/sent if an instance of B OR C with the
same
> instance id is not received/sent.
>
> thanks in advance,
> Andreas