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Newsgroups: comp.lang.ada
Date: Wed, 12 Sep 2018 07:47:53 -0700 (PDT)
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Subject: Re: Error: "non-local pointer cannot point to a local object"
From: NiGHTS <nights@unku.us>
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Xref: reader02.eternal-september.org comp.lang.ada:54333
Date: 2018-09-12T07:47:53-07:00
List-Id: <comp.lang.ada>

On Wednesday, September 12, 2018 at 3:26:46 AM UTC-4, Dmitry A. Kazakov wro=
te:

> What goal? It looks like a bad design. Copying pointers to integers is=20
> asking for trouble.

The integer was chosen to simplify the example. In the actual application i=
t is a tree container, where there is a single thread that is expected to m=
anipulate various contexts of the same tree, thus multiple working records =
for the same tree.

>=20
> BTW, if you used Ada.Finalization.Controlled, as you likely should, and=
=20
> derived one record from another then default copying before Adjust would=
=20
> copy pointer too. What would happen with access info, I have no idea,=20
> probably copied as-is. (Yet another reason not to use anonymous access=20
> types inside records unless for Rosen's trick or access-to-constant)
>=20
While my example does not show Ada.Finalization.Controlled in use, my appli=
cation's record indeed is derived from this object. Still, I am not sure ho=
w overriding Adjust would be applied to my example. Would you show me a qui=
ck and dirty example of how this would be done?

> --=20
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de