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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada requires too much typing!
Newsgroups: comp.lang.ada
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Date: Thu, 10 Jun 2010 11:20:28 +0200
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Date: 2010-06-10T11:20:29+02:00
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On Thu, 10 Jun 2010 01:51:54 -0700 (PDT), Vadim Godunko wrote:

> On Jun 10, 12:21�pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
>>
>> Hmm, I never use access to tagged types except for:
>>
> By "access types" I mean access to classwide types.

I use them even less frequently than access to specific types. You probably
have in mind containers of class-wide objects? But they are really rare and
there is no need to leak access types into their interfaces. (Of course
excluding things like doubly-linked lists, graphs etc)

>> BTW, by "access types in OOP way", do you mean pointers, references or
>> heap-allocated objects?
>>
> I mean distinguishing of objects by instance in opposite to
> distinguishing by value.

By instance = by specific type? This is dispatch, need not to go through an
access type. Ada nicely allows me to hide access types behind
implementations. It is a pity that return by reference was scrapped in
favor of Pickwickian functions. Otherwise, even handles to objects might
have avoided access types.

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