Re: Language lawyer question: Equality on 'Access attributes

[Robert A Duff <bobduff@shell01.TheWorld.com>]

Ze Administrator <groleau+news@freeshell.org> writes:

> Robert A Duff wrote:
> > No.  If there are more than one "=" visible that take access-to-integer,
> > then it would be ambiguous.  In the example given, there was only one
> > such "=".  The point is, resolution of "=" is just like any other
> > subprogram.
> 
> There was no definition of "=" in the example,
> nor was there a type definition to imply one.

The example was:

package Pak1 is
    type Ptr1 is access all Integer;
    X : aliased Integer;
    Y : aliased Integer;
    B : Boolean := X'Access = Y'Access;
end Pak1;

and the declaration of Ptr1 causes an implicit declaration of "=".

If that is the *only* visible "=" on access types, then I claim the
above is legal.

> > If you don't believe this is what the RM says (which was the original
> > question), you should quote chapter and verse.  (I admit that this is a
> 
> I don't recall the reference Robert Eachus used.

I don't think he quoted any RM paragraphs.  I didn't either.
But Adam did, and I agreed with his analysis.

> I could go to groups.google.com but arguing is more fun.

;-)

- Bob