From: Victor Porton <porton@narod.ru>
Subject: Re: Is Adjust allowed on assignment of to a class-wide argument?
Date: Fri, 29 Sep 2017 19:43:17 +0300
Date: 2017-09-29T19:43:17+03:00 [thread overview]
Message-ID: <oqlt74$1j23$3@gioia.aioe.org> (raw)
In-Reply-To: oqlt5s$1j23$2@gioia.aioe.org
Victor Porton wrote:
> Is the following program allowed to print "Adjust"?
>
> GCC 7.2.0 does not print "Adjust". I suspect it is because GCC optimizes
> away an allowed Adjust procedure.
>
> Is it allowed to call Adjust? Will a compiler be conforming to the spec if
> it produces from the below source a program which prints "Adjust"?
>
> ---------------
> with Ada.Finalization;
> with Ada.Text_IO;
>
> procedure Test is
>
> type A is new Ada.Finalization.Controlled with null record;
>
> type B is new A with null record;
>
> overriding procedure Adjust (Object: in out B) is
> begin
> Ada.Text_IO.Put_Line("Adjust");
> end;
>
> procedure X (Arg: A'Class) is
> begin
> null;
> end;
>
> Object: B;
>
> begin
> X(Object);
> end;
I think, it is not allowed because A'Class is a by-reference type.
But I am not 100% sure.
--
Victor Porton - http://portonvictor.org
next prev parent reply other threads:[~2017-09-29 16:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-29 16:42 Is Adjust allowed on assignment of to a class-wide argument? Victor Porton
2017-09-29 16:43 ` Victor Porton [this message]
2017-09-29 17:46 ` AdaMagica
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