From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: Recommendation of safe subset of Ada to use?
Date: Sun, 6 May 2018 09:43:09 +0200
Date: 2018-05-06T09:43:09+02:00 [thread overview]
Message-ID: <pcmbmd$fee$1@dont-email.me> (raw)
In-Reply-To: <9a41b8a3-2ac9-4630-8028-2ba165b0fb0b@googlegroups.com>
On 05/05/2018 11:32 PM, gorgelo@hotmail.com wrote:
>> with Ada.Text_IO; use Ada.Text_IO;
>>
>> procedure jdoodle is
>> type Integer_Access is access all Integer;
>>
>> function Inner(Value : aliased in out Integer) return Integer_Access is
>> begin
>> return Value'Access;
>> end Inner;
>>
>> function Outer return Integer_Access is
>> Value : aliased Integer := 0;
>> begin
>> return Inner(Value);
>> end Outer;
>>
>> Ptr : Integer_Access := Outer; -- !!! Dangling reference
>> begin
>> Put_Line("Hello World");
>> end jdoodle;
This seems to violate ARM 3.10.2(29): the accessibility level of Value (the
object passed by reference to Inner) is deeper than that of the access type
Integer_Access. I cannot find an exception to this for aliased parameters.
--
Jeff Carter
"It is the German who is so uncourteous to his verbs."
A Scandal in Bohemia
122
next prev parent reply other threads:[~2018-05-06 7:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-05 21:23 Recommendation of safe subset of Ada to use? joakimds
2018-05-05 21:32 ` gorgelo
2018-05-06 7:43 ` Jeffrey R. Carter [this message]
2018-05-06 8:45 ` Niklas Holsti
2018-05-06 8:52 ` gorgelo
2018-05-06 13:15 ` Jere
2018-05-06 13:47 ` Jere
2018-05-06 21:28 ` Brad Moore
2018-05-08 0:19 ` Randy Brukardt
2018-05-08 8:07 ` Simon Wright
2018-05-07 15:54 ` onox
2018-05-08 0:22 ` Randy Brukardt
2018-05-08 0:06 ` Randy Brukardt
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