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From: CTips <ctips@bestweb.net>
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Tue, 08 Mar 2005 15:10:34 -0500
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Xref: g2news1.google.com comp.lang.ada:8879 comp.lang.c++:44650
 comp.realtime:1078 comp.software-eng:4633
Date: 2005-03-08T15:10:34-05:00
List-Id: <comp.lang.ada>

Pascal Obry wrote:
> CTips <ctips@bestweb.net> writes:
> 
> 
>>Free? Well, lets look at one particular issue:  pointers to arbitrary
>>locations. In C, its a common idiom to do the following:
>>    foo(int * p)
>>    {
>>       int * z;
>>       for( i ... ) {
>>         ... p[i]...;
>>       }
>>       z = p;
>>    }
>>
>>    ...
>>    foo( &x[lo] );
>>    ...
>>
>>Now, how can *any* language check to see that p[i] is within bounds?
> 
> 
> Good you asked! Let's code this example in Ada (using Ada and
> not C/C++ style, in Ada for the above example we do not need a pointer):
> 
>    type T is array (Positive range <>) of Integer;
> 
>    procedure Foo (P : in out T) is
>       Z : Positive;
>    begin
>       for I in P'Range loop
>          ... P(i)...;
>         --  Here P(i) is always within the bounds, no check needed.        
>       end loop;
>       Z := P'First;

Nope, not z = p[0], z = p; Z is a _pointer_ to int, not an int.

>    end Foo;
> 
>    ...
> 
>    Foo (X (Lo .. X'Last));
> 
> 
>>Bullsh*t. In several ways, of which two are:
> 
> 
> Given your assumption about maybe you just don't know Ada.

Try again. Show me how sizeof(z) != 8 in Ada.

> 
> Pascal.
>