From: Vance Christiaanse <cintech@ix.netcom.com>
Subject: Re: Primitive Operations Question
Date: 1996/07/31
Date: 1996-07-31T19:17:18-05:00 [thread overview]
Message-ID: <31FFBFC8.32C9@ix.netcom.com> (raw)
In-Reply-To: DvFC1u.FJG@world.std.com
Robert A Duff wrote:
>
> In article <31FE812C.7B3D@ix.netcom.com>,
> Vance Christiaanse <cintech@ix.netcom.com> wrote:
> >Much to my dismay, the following procedure compiles on the WebAda
> >(GNAT 3.04) compiler. By my reading of RM95 3.2.3, A and B don't
> >fit any part of the definition of primitive operations, so I
> >don't see why iheritance seems to be occurring.
>
> I agree. Sounds like a compiler bug.
>
> >... When I replace
> >all three types with a hierarchy of tagged types, both calls
> >fail to compile, as I would have expected.
>
> Strange. The word "tagged" appears nowhere in the definition in of
> "primitive subprogram" in 3.2.3, so it shouldn't make any difference.
>
> - Bob
Well, type extension of a tagged type in a procedure _could_ lead to
dangling references (see Rationale 4.3, package Outer). I suspect
that's why a compiler would be more careful to prevent it.
Vance
Vance Christiaanse
Cintech Consulting
cintech@ix.netcom.com
next prev parent reply other threads:[~1996-07-31 0:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-30 0:00 Primitive Operations Question Vance Christiaanse
1996-07-31 0:00 ` Samuel Tardieu
1996-07-31 0:00 ` Tucker Taft
1996-07-31 0:00 ` Robert A Duff
1996-07-31 0:00 ` Vance Christiaanse [this message]
1996-08-01 0:00 ` Robert A Duff
1996-08-01 0:00 ` Vance Christiaanse
1996-07-31 0:00 ` Jon S Anthony
1996-08-01 0:00 ` Jon S Anthony
1996-08-01 0:00 ` Robert A Duff
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