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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: How to get the mouse position with JEWL?
Newsgroups: comp.lang.ada
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Date: Fri, 22 Oct 2010 09:35:56 +0200
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On Fri, 22 Oct 2010 00:39:22 +0000 (UTC), tmoran@acm.org wrote:

>>> 3. My copy of win32.ads declares
>>>   subtype PVOID is System.Address;
>>> System.Address is not the same as an access value to my preferred Ada
>>> compiler.
>>
>> But PVOID is an address, if an Ada's access type is not, then it cannot be
>> used for PVOID.
>    An "address" on a Wintel architecture is a segment and an offset.
> (remember memory models?)

Yes. But Win32 has flat memory model, so PVOID is must be a far pointer at
least. [ BTW, it is not certain what is "address", virtual? physical? The
OS API may remap process addresses to the kernel ones etc. ]

>  So Janus Ada's System.Address is a segment
> and an offset.  PVOID is a C pointer, which is only an offset, the same as
> an Ada access value in Janus Ada.

There is no reason why Ada access type (without the Convention pragma)
should be equivalent to C pointer.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de