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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Access keyword
Newsgroups: comp.lang.ada
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Date: Wed, 30 Apr 2008 09:56:44 +0200
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On Wed, 30 Apr 2008 00:15:47 -0700 (PDT), Maciej Sobczak wrote:

> On 29 Kwi, 23:32, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> 
>> Anonymous access types (a superset of access parameters) mainly exist in Ada
>> to make it easier for C++ and Java programmers to move their rotten designs
>> to Ada.
> 
> Anonymous access types are used by Ada.Containers for iteration (among
> others). "Rationale" by Barnes presents some nice examples with
> downward closures as well.

But most (if not all) of these could certainly be addressed to the language
design faults. One does not need explicit pointers in order to implement
downward closures. The same is true for returning objects by reference.
There is no proper abstraction of array allowing "for Item in Container
loop". The notorious mix-in inheritance is often just a kludge, necessary
because the language lacks multiple inheritance or else, because certain
types (like tasks and protected objects) cannot be inherited from. The
Rosen trick is used because procedures cannot have results. Have I forgot
something?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de