From: rick H <rik_nntp@dsl.pipex.com>
Subject: Re: Instantiating private types with discriminants?
Date: Wed, 10 May 2006 15:10:51 GMT
Date: 2006-05-10T15:10:51+00:00 [thread overview]
Message-ID: <%nn8g.29165$_k2.508499@news2.nokia.com> (raw)
In-Reply-To: 1147270882.727958.212080@u72g2000cwu.googlegroups.com
Ludovic Brenta <ludovic@ludovic-brenta.org> wrote:
> rick H wrote :
>> Thanks, Ludovic. Bearing in mind that, in my original example, Var_A is
>> declared as an *access* to the class-wide type, I tried declaring the
>> various Put procedures as you showed, and then simply dereferencing
>> Var_A when calling Put:
>> Put (Var_A.all);
>> However, the compiler (gnat) complained that I cannot use a class-wide
>> argument in this case.
>
> This sounds suspicious; it should work. Could you post your full source
> code? I think there may be a small mistake somewhere.
>
with Ada.Integer_Text_IO;
with Ada.Float_Text_IO;
procedure Simple_Case is
type General_T is tagged null record;
type Access_T is access General_T'Class;
type Type_A is new General_T with
record
Data : Integer;
end record;
type Type_B is new General_T with
record
Data : Float;
end record;
procedure Put (Item: in General_T) is
begin
null;
end Put;
procedure Put (Item: in Type_A) is
begin
Ada.Integer_Text_IO.Put (Item.Data);
end Put;
procedure Put (Item: in Type_B) is
begin
Ada.Float_Text_IO.Put (Item.Data);
end Put;
Var_A : Access_T; -- could be "new Type_A" or a "new Type_B"
begin
-- Var_A := new Type_A' (Data => 100);
Var_A := new Type_B' (Data => 100.0);
Put (Var_A.all);
end Simple_Case;
next prev parent reply other threads:[~2006-05-10 15:10 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-09 13:17 Instantiating private types with discriminants? rick H
2006-05-09 13:45 ` Georg Bauhaus
2006-05-09 14:06 ` rick H
2006-05-09 13:56 ` Ludovic Brenta
2006-05-09 14:24 ` rick H
2006-05-09 19:48 ` Ludovic Brenta
2006-05-09 14:05 ` Dmitry A. Kazakov
2006-05-09 14:48 ` rick H
2006-05-09 15:20 ` Jerry Petrey
2006-05-09 15:42 ` rick H
2006-05-09 15:53 ` Avoiding use Ada.Tags (was Re: Instantiating private types with discriminants?) Alex R. Mosteo
2006-05-09 16:01 ` Instantiating private types with discriminants? Dmitry A. Kazakov
2006-05-10 7:42 ` rick H
2006-05-10 9:09 ` Ludovic Brenta
2006-05-10 11:49 ` Georg Bauhaus
2006-05-10 13:44 ` rick H
2006-05-10 14:21 ` Ludovic Brenta
2006-05-10 15:10 ` rick H [this message]
2006-05-10 15:45 ` Ludovic Brenta
2006-05-10 14:41 ` Dmitry A. Kazakov
2006-05-10 15:34 ` rick H
2006-05-10 19:01 ` Georg Bauhaus
2006-05-10 19:05 ` Ludovic Brenta
2006-05-10 21:52 ` Rick H
2006-05-11 1:17 ` Jeffrey R. Carter
2006-05-11 7:44 ` Dmitry A. Kazakov
2006-05-11 8:27 ` rick H
2006-05-11 10:28 ` Dmitry A. Kazakov
2006-05-11 15:59 ` Robert A Duff
2006-05-12 7:37 ` Dmitry A. Kazakov
2006-05-12 9:24 ` Georg Bauhaus
2006-05-12 12:40 ` Dmitry A. Kazakov
2006-05-12 18:25 ` Randy Brukardt
2006-05-09 19:57 ` "Use" and "=" for Tags (was: Re: Instantiating private types with discriminants?) Jeffrey R. Carter
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