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From: Martin Krischik <krischik@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: Reprise: 'in out' parameters for functions
Date: Fri, 09 Apr 2004 13:23:12 +0200
Organization: AdaCL
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Date: 2004-04-09T13:23:12+02:00
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Dmitry A. Kazakov wrote:

> Florian Weimer wrote:
> 
>> Stephen Leake <stephen_leake@acm.org> writes:
>> 
>>> Ada has a wart. Let's admit it, and move on.
>> 
>> Can't we fix that one without breaking backwards compatibility?
> 
> procedure Has_A_Result (...) return Result;

This solution would call for precise documentation (advantages,
disadvantages) etc. pp. Plus a quick summary ("functions are faster") for
the beginner.

Otherwise the same problems as with "access all" will arise. Many programers
use "access all" all the time - even when not needed, ignoring the
diadvantages.

>> Or are politics involved?
> 
> I think so. But there also is the problem of evaluation order, though
> simply ignored for access parameters of functions.

See above. Have you heard of GNATs "pragma Pure_Function"?

Prehaps making function even more restive plus procedures with return plus a
"functions are faster" statement might do the trick.

With Regards

Martin

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