From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Subject: Re: access check failure in "adjust" of a controlled type in aggregate assignement but not with normal variable assignement
Date: Thu, 17 May 2018 21:48:40 +0300
Date: 2018-05-17T21:48:40+03:00 [thread overview]
Message-ID: <fm6149Fpr81U1@mid.individual.net> (raw)
In-Reply-To: <3c1a0e9a-6238-4cf3-b978-f08fd7dd420d@googlegroups.com>
On 18-05-17 20:21 , Mehdi Saada wrote:
> I used controlled type to implement deep copy of lists, but I get
> raised PROGRAM_ERROR : adjust/finalize raised CONSTRAINT_ERROR: essai2.adb:61 access check failed
>
> The definitions:
> type Matrice_Creuse is new Ada.Finalization.Controlled with record
> First : Node_Access;
> Number : Natural := 0;
> Max_Indices : T_INDICE := (0, 0);
> end record;
> type t_indice is record
> Column, Line : natural ;
> end record;
> procedure Adjust (Matrice : in out Matrice_Creuse) is
> begin
> if Matrice.First = null then return;
> else
> declare
> Iter : Node_Access := Matrice.First;
> Iter_R : Node_Access := new Node'(Iter.all);
> begin
> for I in 2 .. Matrice.Number loop
> pragma Assert (Iter /= null); -- useless
> Iter_R.Next := new Node'(Iter.Next.all);
> Iter := Iter.Next; -- LINE 61 HEEEEREEE
> Iter_R := Iter_R.Next;
> end loop;
> end;
> end if;
> end Adjust;
Your Adjust never reassigns Matrice.First, so it continues to refer to
the original list, not to the new deep copy.
--
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
. @ .
next prev parent reply other threads:[~2018-05-17 18:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-17 17:21 access check failure in "adjust" of a controlled type in aggregate assignement but not with normal variable assignement Mehdi Saada
2018-05-17 18:48 ` Niklas Holsti [this message]
2018-05-17 22:38 ` Mehdi Saada
2018-05-18 0:13 ` Mehdi Saada
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