From: mg@harp.camb.inmet.com (Mitch Gart)
Subject: Re: Converting C++ class to Ada
Date: 1996/12/20
Date: 1996-12-20T00:00:00+00:00 [thread overview]
Message-ID: <E2ptyG.GIu.0.-s@inmet.camb.inmet.com> (raw)
In-Reply-To: JSA.96Dec19214712@alexandria
Jon S Anthony (jsa@alexandria) wrote:
: CE is raised if a null value is passed to an access _parameter_.
(snip)
: A good thing IMO on both counts. See in particular 11.5(11)
I think this is a mistake in Ada 95. Not allowing null for an
access parameter makes it harder to interface to C:
procedure P(param: access thing);
pragma import(C, P);
You can't call P(null) even though the C function may have
semantics defined for null. You have to make up a named
access type for the parameter.
Users of Win32Ada and X11Ada will notice that the bindings
contain access parameters in many places. This is a mistake
that needs fixing given the above Ada 95 rule.
- Mitch Gart
- mg@inmet.com
next prev parent reply other threads:[~1996-12-20 0:00 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-12-10 0:00 Converting C++ class to Ada Ken Garlington
1996-12-11 0:00 ` Jon S Anthony
1996-12-12 0:00 ` Ken Garlington
1996-12-18 0:00 ` Jon S Anthony
1996-12-18 0:00 ` Matthew Heaney
1996-12-19 0:00 ` Robert A Duff
1996-12-20 0:00 ` Stephen Leake
1996-12-20 0:00 ` Robert A Duff
1996-12-20 0:00 ` Jon S Anthony
1996-12-20 0:00 ` Mitch Gart [this message]
1996-12-20 0:00 ` Norman H. Cohen
1996-12-21 0:00 ` Jon S Anthony
1996-12-11 0:00 ` Norman H. Cohen
1996-12-12 0:00 ` Jon S Anthony
1996-12-11 0:00 ` Stephen Leake
1996-12-13 0:00 ` Stephen Leake
1996-12-11 0:00 ` Larry Kilgallen
1996-12-12 0:00 ` Dale Stanbrough
1996-12-12 0:00 ` Constructors for Ada (was: Converting C++ class to Ada) Matthew Heaney
1996-12-13 0:00 ` Norman H. Cohen
1996-12-13 0:00 ` Matthew Heaney
1996-12-17 0:00 ` Robert I. Eachus
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox