From: Matthew Heaney <mheaney@on2.com>
Subject: Re: Containers - nontrivial element access
Date: Thu, 04 Oct 2007 07:01:15 -0700
Date: 2007-10-04T07:01:15-07:00 [thread overview]
Message-ID: <1191506475.115935.221440@w3g2000hsg.googlegroups.com> (raw)
In-Reply-To: <4704e442$0$30370$9b4e6d93@newsspool4.arcor-online.net>
On Oct 4, 9:01 am, Georg Bauhaus <rm.tsoh+bauh...@maps.futureapps.de>
wrote:
> Why not strive for something like
>
> swap_salary(c1, c2);
> where
> c1, c2: Cursor;
>
> As these all are implementation level thoughts, inviting
> proper information hiding in place of hinting to mechanisms
> in function names (swap), IMHO.
Right, and you can generalize that further:
generic
with package VT is new Vectors (<>);
with procedure Process (I, J : VT.Element_Type);
procedure Generic_Update_Elements_By_Index
(V : in out Vector;
I, J : in VT.Index_Type);
procedure Generic_Update_Elements_By_Index
(V : in out Vector;
I, J : in VT.Index_Type)
is
procedure Process_I (EI : in out ET) is
procedure Process_J (EJ : in out ET) is
begin
Process (EI, EJ);
end;
begin
V.Update_Element (J, Process_J'Access);
end;
begin
V.Update_Element (I, Process_I'Access);
end Generic_Update_Elements_By_Index;
So now you can say:
procedure Swap_Salary (I, J : in out Person) is
S : constant Salary_Type := I.Salary;
begin
I.Salary := J.Salary;
J.Salary := S;
end;
procedure Swap_Salary is
new Generic_Update_Elements_By_Index
(People_Vectors.Vector_Type,
Swap_Salary);
V : Vector;
Swap_Salary (V, I, J);
next prev parent reply other threads:[~2007-10-04 14:01 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-01 21:55 Containers - nontrivial element access Maciej Sobczak
2007-10-01 23:52 ` Alex R. Mosteo
2007-10-02 16:40 ` Matthew Heaney
2007-10-02 23:16 ` Alex R. Mosteo
2007-10-02 20:47 ` Maciej Sobczak
2007-10-02 23:23 ` Alex R. Mosteo
2007-10-02 0:39 ` Jeffrey R. Carter
2007-10-02 16:44 ` Matthew Heaney
2007-10-03 0:20 ` Jeffrey R. Carter
2007-10-03 19:40 ` Maciej Sobczak
2007-10-03 19:56 ` Matthew Heaney
2007-10-03 20:21 ` Dmitry A. Kazakov
2007-10-03 22:37 ` Matthew Heaney
2007-10-04 8:06 ` Dmitry A. Kazakov
2007-10-03 22:02 ` Jeffrey R. Carter
2007-10-04 0:16 ` Robert A Duff
2007-10-07 8:41 ` Jacob Sparre Andersen
2007-10-11 19:15 ` Robert A Duff
2007-10-14 4:59 ` Jacob Sparre Andersen
2007-10-14 7:24 ` Dmitry A. Kazakov
2007-10-14 13:49 ` Georg Bauhaus
2007-10-14 15:07 ` Dmitry A. Kazakov
2007-10-02 20:50 ` Maciej Sobczak
2007-10-03 0:22 ` Jeffrey R. Carter
2007-10-03 8:26 ` Dmitry A. Kazakov
2007-10-03 18:49 ` Jeffrey R. Carter
2007-10-03 19:09 ` Matthew Heaney
2007-10-03 19:15 ` Simon Wright
2007-10-03 19:48 ` Maciej Sobczak
2007-10-03 19:58 ` Matthew Heaney
2007-10-03 19:35 ` Dmitry A. Kazakov
2007-10-02 2:34 ` Randy Brukardt
2007-10-02 16:47 ` Matthew Heaney
2007-10-02 7:23 ` Dmitry A. Kazakov
2007-10-02 16:37 ` Matthew Heaney
2007-10-02 21:02 ` Maciej Sobczak
2007-10-02 22:20 ` Matthew Heaney
2007-10-03 19:59 ` Maciej Sobczak
2007-10-03 22:55 ` Matthew Heaney
2007-10-04 0:22 ` Robert A Duff
2007-10-04 13:01 ` Georg Bauhaus
2007-10-04 14:01 ` Matthew Heaney [this message]
2007-10-04 21:58 ` Matthew Heaney
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