From: matteo.bordin@gmail.com
Subject: Re: prohibit certain generic instantiations in Ada 2005
Date: 12 Feb 2006 00:55:52 -0800
Date: 2006-02-12T00:55:52-08:00 [thread overview]
Message-ID: <1139734552.205623.152990@o13g2000cwo.googlegroups.com> (raw)
In-Reply-To: <uzmkxrjol.fsf@acm.org>
As I explained in a prewieus post, my int/float example was just
didactic. I want that kind of checking because I want to use generics
as a generative environment for a component-based approach. If I can
map to the source code the knowledge that some template instantiations
are not allowed, then I can let the compiler check for me if the user
of the library I am writing is doing something wrong. For example,
imagine I want to compose a car component with an Engine and a
Transmission. Electric engine can be coupled only with automatic
transmission, while gasoline engine can work with both automatic and
manual transmission. Then the Car component is:
generic
type My_Engine is new Engine with private;
type My_Transmission is new Transmission with private;
package Car is
....
Then I want to prohibit:
package My_Car is new Car(My_Engine => Electric_Engine, My_Transmission
=> Manual_Tansmission).
As you can see there is a reason to do that. And there is other reasons
to want static (compile-time) checking insteam of run-time exceptions.
next prev parent reply other threads:[~2006-02-12 8:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-09 18:01 prohibit certain generic instantiations in Ada 2005 matteo.bordin
2006-02-09 20:02 ` Matthew Heaney
2006-02-10 14:18 ` matteo.bordin
2006-02-10 18:25 ` Dmitry A. Kazakov
2006-02-10 19:03 ` Georg Bauhaus
2006-02-11 10:45 ` Dmitry A. Kazakov
2006-02-11 8:04 ` matteo.bordin
2006-02-11 9:54 ` Martin Krischik
2006-02-11 10:20 ` matteo.bordin
2006-02-11 12:46 ` Martin Krischik
2006-02-11 10:45 ` Dmitry A. Kazakov
2006-02-11 22:20 ` Jeffrey R. Carter
2006-02-11 15:36 ` Stephen Leake
2006-02-12 8:55 ` matteo.bordin [this message]
2006-02-12 9:49 ` Dmitry A. Kazakov
2006-02-12 12:41 ` matteo.bordin
2006-02-13 19:14 ` Matthew Heaney
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