From: Jere <jhb.chat@gmail.com>
Subject: Re: A function that cannot be called?
Date: Tue, 23 Oct 2018 07:35:52 -0700 (PDT)
Date: 2018-10-23T07:35:52-07:00 [thread overview]
Message-ID: <a25bdd7c-6ca0-4520-b1bc-c33cdaab1625@googlegroups.com> (raw)
In-Reply-To: <pqn1km$28q$1@dont-email.me>
On Tuesday, October 23, 2018 at 7:45:27 AM UTC-4, G.B. wrote:
> On 21.10.18 13:30, Egil H H wrote:
>
> > package What is
> > pragma Assertion_Policy(Check);
> >
> > type Void is private with Type_Invariant => False;
> >
> > function Impossible return Void with Pre => False;
> >
> > private
> >
> > type Void is null record;
> >
> > end What;
>
> This approach maybe illustrates a point best: in which way
> does Ada's type system support detecting errors in a program
> early? Or is is SPARK's type system? Compile time will be best.
>
The difficulty with compile time comes from your requirements I think.
In order for the function to exist, the compiler needs to have it
actually be callable. Since Ada was not designed with such a type in
mind, it would be difficult for the compiler to meet both requirements
at the same time. If it were built from scratch with such a type in
mind, perhaps.
next prev parent reply other threads:[~2018-10-23 14:35 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-18 12:14 A function that cannot be called? G.B.
2018-10-18 15:33 ` Stefan.Lucks
2018-10-18 20:21 ` G.B.
2018-10-18 20:57 ` Niklas Holsti
2018-10-19 7:15 ` Dmitry A. Kazakov
2018-10-19 13:55 ` G.B.
2018-10-19 15:31 ` Dmitry A. Kazakov
2018-10-18 17:03 ` AdaMagica
2018-10-18 19:36 ` G.B.
2018-10-18 21:30 ` Randy Brukardt
2018-10-19 14:00 ` G.B.
2018-10-19 15:39 ` Dmitry A. Kazakov
2018-10-20 1:34 ` Randy Brukardt
2018-10-20 9:14 ` G.B.
2018-10-20 11:13 ` Simon Wright
2018-10-20 14:11 ` Dmitry A. Kazakov
2018-10-21 9:25 ` G.B.
2018-10-21 9:07 ` G.B.
2018-10-21 9:51 ` Dmitry A. Kazakov
2018-10-21 10:57 ` Niklas Holsti
2018-10-21 18:00 ` Simon Wright
2018-10-19 8:48 ` AdaMagica
2018-10-19 11:15 ` G.B.
2018-10-19 17:06 ` AdaMagica
2018-10-19 19:57 ` G.B.
2018-10-19 22:06 ` Jere
2018-10-21 10:14 ` G.B.
2018-10-21 11:30 ` Egil H H
2018-10-23 11:45 ` G.B.
2018-10-23 14:35 ` Jere [this message]
2018-10-23 14:57 ` Dmitry A. Kazakov
2018-10-23 17:49 ` G.B.
2018-10-23 19:25 ` Dmitry A. Kazakov
2018-10-24 7:35 ` G.B.
2018-10-24 8:14 ` Dmitry A. Kazakov
2018-10-19 18:19 ` marciant
2018-10-19 18:22 ` marciant
2018-10-20 1:36 ` Randy Brukardt
2018-10-20 2:54 ` marciant
2018-10-19 20:25 ` Shark8
2018-10-19 23:28 ` marciant
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