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Newsgroups: comp.lang.ada
Subject: Re: put of access type
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From: Stephen Leake <stephen_leake@stephe-leake.org>
Date: Thu, 20 Aug 2009 04:05:51 -0400
Message-ID: <ur5v6x63k.fsf@stephe-leake.org>
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Date: 2009-08-20T04:05:51-04:00
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Dennis Lee Bieber <wlfraed@ix.netcom.com> writes:

> On Tue, 18 Aug 2009 23:36:15 -0400, Rob Solomon
> <usenet@drrob1-noreply.com> declaimed the following in comp.lang.ada:
>
>> The only way I know to see the results of my playing is to output
>> them.
>>
> 	And what meaning would some address from either the stack or a heap
> have? You can't modify them -- Ada's access types are so heavily
> controlled they are basically black boxes with no inherent meaning.

Yes, but seeing the actual values helps the learning process.

For example:

A : aliased Interfaces.Unsigned_32;
B : aliased Interfaces.Unsigned_32;

begin
    Put (To_Integer (A'access));
    Put (To_Integer (B'access));

The results should be 4 bytes apart.

But doing the same with unconstrained arrays will show "extra" bytes
being allocated; that's the array limits, also known as "dope".

Another way to see the values of access types is in the debugger.

-- 
-- Stephe