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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Basic issue with dotted notation and tagged types
Date: Mon, 22 Oct 2012 00:55:08 +0200
Organization: Ada @ Home
Message-ID: <op.wmjwl6mdule2fv@cardamome>
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Date: 2012-10-22T00:55:08+02:00
List-Id: <comp.lang.ada>

I can't remember if this was already discussed here, somewhere in a  =

rationale or an RM comment, here is something I really don't like, with =
a  =

field (or member) of a tagged type and a function, both of the same name=
;  =

a very basic case:


     with Ada.Text_IO;

     procedure Test2 is

        package IO renames Ada.Text_IO;

        -- type T is tagged;
        -- function F (E : T'Class) return Character;

        type T
           is tagged record
              F : Character :=3D 'A';
           end record;

        function F
          (E : T'Class)
           return Character
           is ('B');

        E : T;
        C : Character :=3D E.F; -- The function or the field?
     begin
        IO.Put (C);
     end;


Will this display `A` or `B`? Actually, the program compiled with GNAT  =

4.6, displays `A`. It displays the same even when the two commented line=
s  =

are commented=E2=80=91out and thus the function `F` is declared before t=
he field  =

`F`. I can't remember if the RM have special wordings about it, but I fe=
el  =

this does not honour the principle of least surprise. May be this should=
  =

be disallowed, to access any one of the two, when both are together  =

visible from a scope?


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity