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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Controlling endian-ness?
Date: Tue, 5 Aug 2008 17:16:25 -0700 (PDT)
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Date: 2008-08-05T17:16:25-07:00
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On Aug 5, 3:14 pm, "Peter C. Chapin" <pcc482...@gmail.com> wrote:
> anon wrote:
> > For using Unsigned_32. Why not just override the built-in Write attributes
> > routines for Unsigned_32 by re-writing the attributes routines. This may at
> > most require a new package with a few extra attributes routines that may
> > be needed. Also, this will also allow you to use "Shift_Left/Shift_Right"
> > directly with Unsigned_32.
>
> > So in your program you could use:
>
> >    Data : Unsigned_32 ;
> >   ...
> >    Unsigned_32'Write ( Stream_Pointer, Data ) ;
>
> I actually tried something like this but the compiler told me that I
> couldn't redefine attributes for that type (or something like that). I
> think the problem is that since the type is defined in another package
> it is already frozen or some such. It could also be that I did it wrong.

Yes.  You can't apply any "for T'attribute use..." clause to something
defined in another package.  (It sounds to me like this is what you
tried... if I guessed wrong, sorry.)  You might consider defining your
own type (perhaps *derived* from Unsigned_32) and using your new type
when declaring a variable or component that needs to be written using
a special routine.

     type My_Unsigned_32 is new Unsigned_32;
     procedure My_Write
       (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
        Item   : in My_Unsigned_32);
     for My_Unsigned_32'Write use My_Write;

                                    -- Adam
                                -- Adam