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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: How to get the mouse position with JEWL?
Date: Thu, 21 Oct 2010 04:08:18 +0000 (UTC)
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Date: 2010-10-21T04:08:18+00:00
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> I'd add
>
> pragma Convention (C, Points);
>
> just to be safe.
  Yes, I should have specified the layout.

Personally I'd use a record representation clause that says exactly what I
need.  Saying to the Ada compiler "use the 'C' convention - and I hope you
are thinking of the same C compiler I am", always seems to me less certain
of getting the correct result.

> (Point : in Points)
>
> should work just as well, and has the advantages that
> you don't need "aliased"
>
> >      ...
> >        if getcursorpos(current'access) = 0 then
>
> and you don't need 'access.
>
> It is a little confusing because an "in" parameter is modified.
  I'm inclined to be straightforward unless there's some awfully good
reason for being devious.