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From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Announce: Grace project site operational
Date: Mon, 13 May 2002 10:10:47 +0200
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Date: 2002-05-13T10:10:47+02:00
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On Fri, 10 May 2002 14:00:50 -0500, "Randy Brukardt"
<randy@rrsoftware.com> wrote:

>Dmitry A. Kazakov wrote in message ...
>>On Thu, 9 May 2002 15:02:47 -0500, "Randy Brukardt"
>><randy@rrsoftware.com> wrote:
>>
>>>Supporting default parameters for generic types would be (I think) a
>>>whole lot simpler than 'types as objects'. Ada has default parameters
>>>for generic subprogram parameters, why not types?
>>>
>>>Something like:
>>>
>>>    type Count is (<>) use Natural;
>>>
>>>seems like it would work. Probably worth thinking about a bit.
>(Warning:
>>>I have made no effort to think about the ramifications of this idea!!)
>>
>>We already have two different words for IS: "is" and ":=", "use" would
>>be a third one. (:-))
>
>I know from past discussions that the ARG really does not want repeated
>reserved words in the syntax. So,
>
>    type Count is (<>) is Natural;
>
>is out. ":=" applies to objects, not types, and I don't think we want to
>make types look like objects.

I am not so sure. I think that "type Count is (<>);" is logically
flawed. Here (<>) is a class of types, so Count is an object of this
"type type".Thus it would be natural to have:

Count : (<>) := Natural;

A similar thing could be done with subprograms. And of course, we
should have subprogram types! At least to reduce use of nasty
access-to-subprogram objects.

> "use" is used to mean "is" in
>representation clauses already, so it seems to be the logical candidate.
>But there may be a better syntax.

---
Regards,
Dmitry Kazakov
www.dmitry-kazakov.de