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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Dispatch on the result still does not work?
Date: Mon, 13 Jul 2009 09:55:39 -0700 (PDT)
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Date: 2009-07-13T09:55:39-07:00
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On Jul 12, 1:30=A0pm, sjw <simon.j.wri...@mac.com> wrote:
> On Jul 12, 6:11=A0pm, AdaMagica <christoph.gr...@eurocopter.com> wrote:
>
> > =A0 X : T'Class :=3D S'(Value);
> > begin
> > =A0 =A0X :=3D Value; -- Ambiguous?
>
> > You know, I'm not a language lawyer, but after the initialization, X
> > is constrained to the tag with which it was initialized.
>
> > So to me, it should be dispatching as Dmitry expects.
>
> I think GNAT GPL 2009 might just have a problem in this area: this is
> accepted
>
> procedure Q is
> =A0 =A0X : P.T'Class :=3D P.S'(P.Value);
> begin
> =A0 =A0X :=3D P.T'(P.Value);
>
> but this fails
>
> procedure Q is
> =A0 =A0X : P.T'Class :=3D P.T'(P.Value);
> begin
> =A0 =A0X :=3D P.S'(P.Value);
>
> saying 'tag-indeterminate expression must have type "T"(RM 5.2 (6))'

No, that's not a GNAT problem.  The RM paragraph, which GNAT was good
enough to tell you about, specifically says that a tag-indeterminate
expression must have type T in this case.  I kind of think that if a
GNAT error message refers to a specific RM passage, it's probably a
good idea to read that passage before assuming there's a GNAT
problem.....

                               -- Adam