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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Dispatch on the result still does not work?
Date: Mon, 13 Jul 2009 14:47:59 -0700 (PDT)
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Date: 2009-07-13T14:47:59-07:00
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On Jul 13, 5:55=A0pm, Adam Beneschan <a...@irvine.com> wrote:
> On Jul 12, 1:30=A0pm, sjw <simon.j.wri...@mac.com> wrote:

> > saying 'tag-indeterminate expression must have type "T"(RM 5.2 (6))'
>
> No, that's not a GNAT problem. =A0The 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. =A0I 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.....

OK, mea culpa. However .. if I say P.S'(whatever) and the compiler
tells me it's tag-indeterminate my first reaction is that it must be
confused!

If I hadn't been too taken with the symmetry I'd have realised that I
should have written

procedure Q is
   X : P.T'Class :=3D P.T'(P.Value);
begin
   X :=3D P.T'Class (P.S'(P.Value));

(which (I think) is the 'dynamically tagged' alternative in 5.2(6)
which wasn't mentioned by GNAT).