Re: parent package referring to child

[Vadim Godunko <vgodunko@gmail.com>]

On Oct 11, 8:12 am, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
>
> I think I was the originator of this idea; it allows you to make classwide
> calls for objects of types that you don't actually know about. (I'm not sure
> that it is as useful as I originally thought, but it certainly is a
> less-restrictive rule.)
>
Thanks Matthew and Randy for hint and explanation ;-)

This is really useful (at least for me)! In QtAda binding I have two
types Q_Char and Q_String. Its operations have several cross
references. For use its operations in prefixed view I need to make it
tagged. This is not raise any problem. But with out mentioned rules I
must use anonymous access types for parameters (this is bad, objects
always distinguishable through it values, no reference semantic is
needed) or define both types in same package (this is not so good,
both classes has large API).