From: Stephen Leake <Stephe.Leake@nasa.gov>
Subject: Re: Specialization generic package parameters
Date: Sat, 24 May 2008 08:48:40 -0400
Date: 2008-05-24T08:48:40-04:00 [thread overview]
Message-ID: <ufxs7kguv.fsf@nasa.gov> (raw)
In-Reply-To: 1996bbhvwjxcr$.1s16brw83713g$.dlg@40tude.net
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> Recently I ran into the following problem with generic packages. Consider
>
> type T is tagged null record;
>
> and a generic package that uses it:
>
> generic
> type Some_T is new T with private;
> package P is
> ...
> private
> ...
> end P;
>
> Let there be some type S derived from T:
>
> type S is new T with null record;
>
> Now the question is, how to derive another package Q from P, specialized
> for S, while keeping access to the private part of P?
>
Factor out the types and operations currently in the private part of P
into a helper child package P.Ops.
Access those operations from Q:
4. New package
with P.Ops;
generic
type Some_S is new S with private;
package Q is
private
-- Got access to P.Ops, and have specialization
end P;
How would you do this in some other language?
--
-- Stephe
next prev parent reply other threads:[~2008-05-24 12:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-23 17:29 Specialization generic package parameters Dmitry A. Kazakov
2008-05-23 20:17 ` christoph.grein
2008-05-24 8:00 ` Dmitry A. Kazakov
2008-05-24 12:48 ` Stephen Leake [this message]
2008-05-24 14:07 ` Dmitry A. Kazakov
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