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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: POSIX.Semaphores question
Date: Mon, 05 Dec 2011 17:59:52 +0000
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Date: 2011-12-05T17:59:52+00:00
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awdorrin <awdorrin@gmail.com> writes:

> I tried the following line:
>
> Text_IO.Put_Line( System.Address_Image(SemPtr'Address) & " -> " &
> System.Address_Image(SemPtr.all'Address) );
>
> The first Address_Image worked fine, but I could never get the second
> to compile, I kept seeing the error:
> "prefix of dereference must be an access type"

That's because "type Semaphore_Descriptor is private;", so your code
can't see the fact that it's privately implemented as "access constant
POSIX.C.sem_t;".