From: Graham <graham.stark@virtual-worlds.biz>
Subject: using an Ada.Container as a private type
Date: Thu, 3 Apr 2008 08:29:28 -0700 (PDT)
Date: 2008-04-03T08:29:28-07:00 [thread overview]
Message-ID: <42c84166-c7e4-42e0-b1bf-2104d3bb0cda@e10g2000prf.googlegroups.com> (raw)
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;
but I can't do this. Gnat complains that "type derived from tagged
type must have extension".
I'm fairly new to Ada but thought I was getting on top of it! What is
the principal that stops me doing this? What should I do instead?
thanks,
Graham Stark
next reply other threads:[~2008-04-03 15:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-03 15:29 Graham [this message]
2008-04-03 16:00 ` using an Ada.Container as a private type Robert A Duff
2008-04-03 16:02 ` Dmitry A. Kazakov
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
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