From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Type invariants and private extensions?
Date: Mon, 2 Oct 2017 18:16:16 -0500
Date: 2017-10-02T18:16:16-05:00 [thread overview]
Message-ID: <oquhc0$j1g$1@franka.jacob-sparre.dk> (raw)
In-Reply-To: op6v4m$tmm$1@gioia.aioe.org
"Victor Porton" <porton@narod.ru> wrote in message
news:op6v4m$tmm$1@gioia.aioe.org...
> Egil H H wrote:
>
>> On Monday, September 11, 2017 at 10:48:46 PM UTC+2, Victor Porton wrote:
>>> > The Invariant will then be inherited by all derived types
>>>
>>> It is not what I want. I want different invariants for different derived
>>> types.
>>>
>>
>> You can add new invariants in addition to the ones inherited
>
> I cannot: the compiler gives an error:
>
> package P is
>
> type T is tagged private;
>
> private
>
> type T is tagged null record;
>
> end P;
>
> with P; use P;
>
> package P1 is
>
> type T1 is new T with null record
> with Type_Invariant => True;
>
> end P1;
Right, but you can define a private extension:
package P1 is
type T1 is new T with private;
private
type T1 is new T with null record
with Type_Invariant => True;
end P1;
The semantics is the same as with a plain record extension, and the
invariant makes more sense.
Randy.
prev parent reply other threads:[~2017-10-02 23:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-11 19:51 Type invariants and private extensions? Victor Porton
2017-09-11 20:00 ` Egil H H
2017-09-11 20:48 ` Victor Porton
2017-09-11 21:19 ` Egil H H
2017-09-11 21:27 ` Victor Porton
2017-09-11 21:49 ` Egil H H
2017-09-11 22:00 ` Victor Porton
2017-09-11 22:06 ` Egil H H
2017-09-12 7:30 ` Dmitry A. Kazakov
2017-09-11 22:00 ` Jere
2017-09-11 22:02 ` Victor Porton
2017-09-12 18:26 ` Jeffrey R. Carter
2017-09-12 18:54 ` Victor Porton
2017-09-12 19:56 ` Jeffrey R. Carter
2017-09-12 20:08 ` Victor Porton
2017-09-12 22:34 ` Shark8
2017-09-12 22:59 ` Victor Porton
2017-09-13 4:21 ` Jere
2017-09-13 4:28 ` Jere
2017-09-13 4:34 ` Jere
2017-09-14 13:52 ` Victor Porton
2017-09-15 0:48 ` Jere
2017-09-16 14:22 ` Victor Porton
2017-09-14 7:28 ` Shark8
2017-09-14 13:56 ` Victor Porton
2017-09-14 13:58 ` Victor Porton
2017-09-11 22:48 ` Shark8
2017-10-02 23:16 ` Randy Brukardt [this message]
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