From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: using an Ada.Container as a private type
Date: Thu, 3 Apr 2008 18:02:48 +0200
Date: 2008-04-03T18:02:48+02:00 [thread overview]
Message-ID: <151julprm1vv4.82a26cafccm6$.dlg@40tude.net> (raw)
In-Reply-To: 42c84166-c7e4-42e0-b1bf-2104d3bb0cda@e10g2000prf.googlegroups.com
On Thu, 3 Apr 2008 08:29:28 -0700 (PDT), Graham wrote:
> Hi,
> I'm writing a little financial application. I want to model a
> stream of payments made at arbitrary periods (the periods are positive
> numbers; they might be actual dates later on).
>
> I think I want to declare this:
>
>
> type Payment_Stream is private;
>
> procedure Add_To_Payment_Stream(
> stream : in out Payment_Stream;
> period : Positive;
> amount : Money );
>
> ......
>
> and then privately declare the payment stream as an Ordered Map, like:
>
> private
>
> package Payment_Stream_Package is new Ada.Containers.Ordered_Maps(
> Element_Type => Money,
> Key_Type => Positive );
>
> type Payment_Stream is new Payment_Stream_Package.Map;
type Payment_Stream is new Payment_Stream_Package.Map with null record;
> but I can't do this. Gnat complains that "type derived from tagged
> type must have extension".
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2008-04-03 16:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-03 15:29 using an Ada.Container as a private type Graham
2008-04-03 16:00 ` Robert A Duff
2008-04-03 16:02 ` Dmitry A. Kazakov [this message]
2008-04-03 16:20 ` Graham
2008-04-03 20:41 ` Maciej Sobczak
2008-04-04 8:02 ` Graham
2008-04-04 15:57 ` Adam Beneschan
2008-04-04 17:25 ` Robert A Duff
2008-04-04 19:37 ` Simon Wright
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox