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From: Vance Christiaanse <cintech@ix.netcom.com>
Subject: Re: Primitive Operations Question
Date: 1996/07/31
Message-ID: <31FFBFC8.32C9@ix.netcom.com>#1/1
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references: <31FE812C.7B3D@ix.netcom.com> <DvFC1u.FJG@world.std.com>
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organization: Cintech Consulting
x-netcom-date: Wed Jul 31  7:17:18 PM CDT 1996
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Date: 1996-07-31T19:17:18-05:00
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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