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Date: Tue, 08 Mar 2005 22:21:38 +0100
From: Georg Bauhaus <bauhaus@futureapps.de>
Organization: future apps GmbH
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Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
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Xref: g2news1.google.com comp.lang.ada:8888 comp.lang.c++:44659
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Date: 2005-03-08T22:20:01+01:00
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CTips wrote:
>>>       int * z;
 
> Try again. Show me how sizeof(z) != 8 in Ada.

I'm not sure I understand. On an x86 system,

   type Tiny is range 0 .. 31;
   -- stored in an 8 bits register unless I demand otherwise

   Type TP is access all Tiny;
   for TP'Size use 32;  -- in bits.

Ask for more bits for the pointer if you like. E.g.,

   for TP'Size use 128; 

In this case you get a compiler warning about unused bits. Then,
without any optimization, I get diffs of this sort, reflecting
the difference in the sizes of the pointer types TP:

<       subl    $8, %esp
---
>       subl    $40, %esp
32,33c32,33
<       leal    -1(%ebp), %eax
<       movl    %eax, -8(%ebp)
---
>       leal    -9(%ebp), %eax
>       movl    %eax, -40(%ebp)