From: hreba <f_hreba@yahoo.com.br>
Subject: Re: How can one record component be local and another not?
Date: Tue, 5 May 2020 14:59:18 +0200
Date: 2020-05-05T14:59:18+02:00 [thread overview]
Message-ID: <hhd697FfhvdU1@mid.individual.net> (raw)
In-Reply-To: <b47b2b53-fedc-45b9-b510-8ef4ec37e758@googlegroups.com>
On 5/5/20 1:33 PM, AdaMagica wrote:
> Am Dienstag, 5. Mai 2020 13:04:56 UTC+2 schrieb hreba:
>> I have reduced my problem to the following example:
>>
>> package Aux is
>> type Integer_P is access all Integer;
>> type Rec is record
>> a: aliased Integer;
>> p: Integer_P;
>> end record;
>>
>> procedure Init (r: in out Rec);
>> end Aux;
>>
>> package body Aux is
>> procedure Init (r: in out Rec) is
>> begin
>> r.p:= r.a'Access; -- <-- error!
>> end Init;
>> end Aux;
>
> Imagine you define a local Rec:
>
> with Aux;
> procedure Proc is
> R: Aux.Rec;
> begin
> Aux.Init (R);
> end Proc;
>
> Now R has shorter lifetime than the access type Integer_P. Thus you might have somewhere an access object AO with longer lifetime than R and try to assign
> AO := R.P;
>
> Try Unrestricted_Access.
>
Don't understand that. R.a and R.p have exactly the same lifetime, which
is the lifetime of R, haven't they?
--
Frank Hrebabetzky, Kronach +49 / 9261 / 950 0565
next prev parent reply other threads:[~2020-05-05 12:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 11:04 How can one record component be local and another not? hreba
2020-05-05 11:33 ` AdaMagica
2020-05-05 11:38 ` AdaMagica
2020-05-05 12:59 ` hreba [this message]
2020-05-05 13:19 ` J-P. Rosen
2020-05-05 13:37 ` Jere
2020-05-05 14:28 ` hreba
2020-05-05 15:18 ` AdaMagica
2020-05-05 14:32 ` hreba
2020-05-05 11:43 ` AdaMagica
2020-05-05 12:55 ` hreba
2020-05-05 11:46 ` Simon Wright
2020-05-05 13:07 ` hreba
2020-05-05 17:00 ` Dmitry A. Kazakov
2020-05-05 11:48 ` Niklas Holsti
2020-05-05 13:44 ` hreba
2020-05-05 15:45 ` Jeffrey R. Carter
2020-05-05 17:17 ` hreba
2020-05-05 19:08 ` Niklas Holsti
2020-05-06 19:31 ` hreba
2020-05-09 19:43 ` Niklas Holsti
2020-05-10 15:10 ` hreba
2020-05-05 19:19 ` Jere
2020-05-06 6:42 ` Mark Lorenzen
2020-05-06 8:26 ` Simon Wright
2020-05-06 8:33 ` Mark Lorenzen
2020-05-05 17:32 ` hreba
2020-05-05 19:04 ` Niklas Holsti
2020-05-05 20:11 ` Niklas Holsti
2020-05-06 13:13 ` hreba
2020-05-06 17:30 ` Niklas Holsti
2020-05-06 18:28 ` Jere
2020-05-06 19:09 ` Niklas Holsti
2020-05-07 9:07 ` J-P. Rosen
2020-05-07 10:15 ` Niklas Holsti
2020-05-07 13:00 ` Egil H H
2020-05-07 13:25 ` Simon Wright
2020-05-07 10:31 ` Stefan.Lucks
2020-05-07 11:58 ` J-P. Rosen
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox