From: petter_fryklund@hotmail.com
Subject: Dispatching problem.
Date: Tue, 15 Jan 2008 10:55:46 -0800 (PST)
Date: 2008-01-15T10:55:46-08:00 [thread overview]
Message-ID: <2d63ad45-4d52-4cb2-8dea-e1f92ecaacac@q77g2000hsh.googlegroups.com> (raw)
Hi all!
I get compilation error when I try to dispatch a call using class
wide access variables stating that I cannot call abstract program.
Perhaps oversimplified example is:
package PBN is
type Item_T is abstract tagged null record;
type Item_Ptr is access all Item_T'Class;
function Create (From : in String) return access Item_T'Class is
abstract;
function Img (From : access Item_T'Class) return String is
abstract;
end PBN;
package PBN.Site is
type Site_T is new Item_T with
record
Name : ASU.Unbounded_String;
end record;
type Site_Ptr is access all Site_T;
function Create (From : in String) return Site_Ptr;
function Img (From : access Site_T) return String;
end PBN.Site;
with Ada.Text_IO;
with PBN;
with PBN.Site;
procedure Print is
Site : PBN.Item_Ptr;
begin
Site := PBN.Site.Create ("[Site qwerty]");
Ada.Text_IO.Put_Line (Site.Img); <-----------------
cannot call abstract program
end Print;
Any suggestions (apart from taking extensive course in OOD ;-) ?
Regards,
Petter
next reply other threads:[~2008-01-15 18:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-15 18:55 petter_fryklund [this message]
2008-01-15 19:49 ` Dispatching problem Dmitry A. Kazakov
2008-01-15 20:01 ` petter_fryklund
-- strict thread matches above, loose matches on Subject: below --
2003-02-06 14:04 Petter Fryklund
2003-02-06 15:33 ` James S. Rogers
2003-02-07 7:35 ` Petter Fryklund
2003-02-07 9:01 ` Dmitry A. Kazakov
2003-02-07 14:55 ` Petter Fryklund
2003-02-10 9:12 ` Dmitry A. Kazakov
2003-02-11 8:31 ` Petter Fryklund
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