From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Possible to recover default value of scalar type?
Date: Mon, 14 Dec 2020 19:26:10 -0600 [thread overview]
Message-ID: <rr93bj$kno$1@franka.jacob-sparre.dk> (raw)
In-Reply-To: rr7bqv$19da$1@gioia.aioe.org
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
news:rr7bqv$19da$1@gioia.aioe.org...
> On 2020-12-14 10:01, AdaMagica wrote:
>> I do not really understand the problem. It seems you want to be able to
>> access the default value like so:
>> N: Natural := Natural(A_Type'Default_Value);
>> This is not possible. Thre is no corresponding attribute 'Default_Value.
>> If this presents a real problem, submit it to Ada comment stating why
>> this is important.
>
> It could in the cases like this:
>
> procedure Library_Foo (Bar : Baz := Baz'Default_Value)
I would have suggested to write this as:
procedure Library_Foo (Bar : Baz := <>)
since this is the syntax used in aggregates (and why should aggregates have
all the fun??).
> Put_Line (String (1..10)'Default_Value); -- print garbage
The above isn't a legal attribute prefix in any case (can't slice a type).
And you don't need to because this is clearly an aggregate (which is legal
in Ada 2012):
Put_Line (String'(1..10 => <>)); -- print garbage
Randy.
next prev parent reply other threads:[~2020-12-15 1:26 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-13 9:54 Possible to recover default value of scalar type? reinert
2020-12-14 0:08 ` Stephen Leake
2020-12-14 6:09 ` reinert
2020-12-14 9:01 ` AdaMagica
2020-12-14 9:38 ` Dmitry A. Kazakov
2020-12-14 15:56 ` AdaMagica
2020-12-14 16:31 ` Dmitry A. Kazakov
2020-12-14 18:24 ` Simon Wright
2020-12-14 18:53 ` Dmitry A. Kazakov
2020-12-15 6:47 ` J-P. Rosen
2020-12-15 7:23 ` Dmitry A. Kazakov
2020-12-15 9:07 ` J-P. Rosen
2020-12-15 16:53 ` Simon Wright
2020-12-15 18:14 ` AdaMagica
2020-12-17 0:53 ` Randy Brukardt
2020-12-17 0:48 ` Randy Brukardt
2020-12-15 1:27 ` Randy Brukardt
2020-12-15 9:30 ` Niklas Holsti
2020-12-17 0:45 ` Randy Brukardt
2020-12-15 1:26 ` Randy Brukardt [this message]
2020-12-15 7:35 ` Dmitry A. Kazakov
2020-12-17 0:43 ` Randy Brukardt
2020-12-15 1:21 ` Randy Brukardt
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