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From: Edward Fish <edward.r.fish@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
Date: Fri, 18 Feb 2011 20:21:42 -0800 (PST)
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Date: 2011-02-18T20:21:42-08:00
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On Feb 14, 4:25=A0pm, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> "Hyman Rosen" <hyro...@mail.com> wrote in message
>
> news:4d5872d3$0$1707$882e7ee2@usenet-news.net...
>
> > On 2/11/2011 11:47 PM, Edward Fish wrote:
> >> But if you're using GNAT you may have noticed that it doesn't allow
> >> a straight "For Data'Address Use 16#000B_8000#;" because GNAT
> >> uses a private type and not a derivative of Universal_Integer.
>
> >> They recommend an implementation-dependent "to_Address" function,
> >> but that would make things non-portable.
>
> > Portable to what? Other systems that also happen to have a two-segment
> > address with a video frame buffer at 16#000B_8000#? Aren't you being a
> > little pedantic here?
>
> There definitely are different degrees of portabaility. He's probably
> thinking of "portable for the same target", that is, portable to another =
Ada
> implementation on the same target.
>
> That's not that uncommon of a goal. Claw, for example is intended to be a
> portable interface to Windows, "portable" in the sense that it will work =
on
> all Ada 95 compilers that target Windows. This is something that has to b=
e
> baked in from the beginning, in that if you get in bad habits of dependin=
g
> on implementation-specific behavior, it can be very painful to work out f=
rom
> under them.


You got it in one.