From: "Ayende Rahien" <Dont@spam.me>
Subject: Re: Problem trying to implement generics.
Date: Fri, 13 Apr 2001 13:54:52 +0200
Date: 2001-04-13T13:54:52+02:00 [thread overview]
Message-ID: <9b6m27$68e$1@taliesin.netcom.net.uk> (raw)
In-Reply-To: PDAB6.10174$FD1.1166748@news6-win.server.ntlworld.com
"chris.danx" <chris.danx@ntlworld.com> wrote in message
news:PDAB6.10174$FD1.1166748@news6-win.server.ntlworld.com...
> Hi,
>
> > The error from Object Ada is:
> > bintree.adb: Error: line 9 col 28 LRM:4.1(3), Direct name, root, is not
> > visible, Ignoring future references
> >
> > The error from GNAT is:
> >
> > bintree.adb:9:42: "root" is undefined (more references follow)
> >
> > With nothing more to follow this.
>
> Ok, this means it's not found a definition for it. It doesn't know what
or
> where it is. You probably know that.
>
> [SNIP]
>
> > private
> > type Binary_Tree is new Ada.Finalization.controlled with record
> > root: Node_access := null;
> > end record;
>
> the error comes because
>
> > package body binTree is
> [snip]
> > procedure insert(insert_this : in data_type; Sort : in sort_by) is
> > New_node : Node_Access := new node;
> > current : Node_access := root; -- This is the line it compline about!!
>
> you've forgot to that Root is in Binary_Tree.
Okay, so how do I fix it? And what is wrong, anyway?
> I have a question. From your code it doesn't look like an ADT. Is this
> what you intended? I can't remember the term for what this looks like,
but
> I think it's to do with storing the Tree as a global variable in the
package
> not as an ADT.
Okay, major cocept problem here.
I'm coming here with C/C++ background, and I understand that Ada has a
different OO paradigm.
I assumed that for each Binary_Tree spesific type that I create, there would
be its own Root.
I mean:
package Int_BinTree is new Binary_Tree(data_type=>
Integer,Sort_by=>Integer);
Bin_Tree_First, Bin_Tree_Second : Int_BinTree;
Does Bin_Tree_First.Root = Bin_Tree_Second.Root ?
> If you want an ADT you need to pass in a Binary_Tree type as necessary. I
> didn't see it any where in your code so i'm assuming it's based on a
global
> variable.
I think that you are talking about ADO vs ADT , right?
generic abstract data type & generic abstract data object
> There's nothing wrong doing it this way!
Then why doesn't it compile?
next prev parent reply other threads:[~2001-04-13 11:54 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-11 15:04 Problem trying to implement generics Ayende Rahien
2001-04-12 1:41 ` tmoran
2001-04-12 13:15 ` Ayende Rahien
2001-04-12 18:15 ` tmoran
2001-04-13 11:18 ` Ayende Rahien
2001-04-13 10:35 ` chris.danx
2001-04-13 11:54 ` Ayende Rahien [this message]
2001-04-13 11:49 ` chris.danx
2001-04-13 23:03 ` Ayende Rahien
2001-04-13 23:01 ` Robert A Duff
2001-04-14 0:05 ` Brian Rogoff
2001-04-14 1:12 ` Ayende Rahien
2001-04-14 1:44 ` Brian Rogoff
2001-04-14 14:03 ` Dmitry A. Kazakov
2001-04-14 16:30 ` Ayende Rahien
2001-04-14 16:28 ` Michael Erdmann
2001-04-15 3:27 ` James Rogers
2001-04-15 12:20 ` Ayende Rahien
2001-04-15 14:09 ` Dmitry A. Kazakov
2001-04-15 18:22 ` tmoran
2001-04-15 13:48 ` Dmitry A. Kazakov
2001-04-15 20:44 ` Ayende Rahien
2001-04-16 14:34 ` Dmitry A. Kazakov
2001-04-14 1:33 ` Robert A Duff
2001-04-17 8:50 ` Jean-Pierre Rosen
2001-04-17 13:20 ` Tucker Taft
2001-04-17 16:51 ` Ayende Rahien
2001-04-17 17:16 ` Larry Hazel
2001-04-17 18:11 ` Brian Rogoff
2001-04-17 19:10 ` Marin David Condic
2001-04-17 21:08 ` Brian Rogoff
2001-04-18 15:16 ` Chad R. Meiners
2001-04-18 16:33 ` Marin David Condic
2001-04-17 21:09 ` chris.danx
2001-04-17 21:11 ` chris.danx
2001-04-17 21:17 ` chris.danx
2001-05-08 5:40 ` Lao Xiao Hai
2001-05-11 9:43 ` John English
2001-05-12 19:16 ` Lao Xiao Hai
2001-04-17 19:32 ` Larry Hazel
2001-04-17 21:03 ` Ayende Rahien
2001-04-18 15:48 ` Brian Rogoff
2001-04-20 12:34 ` Georg Bauhaus
2001-04-20 12:42 ` Lutz Donnerhacke
2001-04-20 12:45 ` Lutz Donnerhacke
2001-04-20 19:48 ` Brian Rogoff
2001-04-20 20:36 ` David Starner
2001-04-20 23:02 ` Robert A Duff
2001-04-23 2:45 ` Brian Rogoff
2001-04-24 1:15 ` Robert A Duff
2001-04-24 2:00 ` Brian Rogoff
2001-04-24 15:12 ` Georg Bauhaus
2001-04-24 15:09 ` Georg Bauhaus
2001-04-24 18:36 ` Marius Amado Alves
2001-04-19 13:08 ` Larry Kilgallen
[not found] ` <9bi4g4$97m$1@nh.pace.Organization: LJK Software <YlSyXUaQmD+$@eisner.encompasserve.org>
2001-04-19 14:20 ` Marin David Condic
2001-04-18 5:34 ` Mike Silva
2001-04-18 16:55 ` Ray Blaak
2001-04-24 16:00 ` Tucker Taft
2001-04-12 13:57 ` Andy
2001-04-13 6:34 ` Simon Wright
2001-04-13 11:11 ` Ayende Rahien
2001-04-12 18:06 ` Stephen Leake
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