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From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Question about OO programming in Ada
Date: Tue, 09 Dec 2003 09:19:43 +0100
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Date: 2003-12-09T09:19:43+01:00
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On Tue, 09 Dec 2003 04:38:25 GMT, Hyman Rosen <hyrosen@mail.com>
wrote:

>Dmitry A. Kazakov wrote:
>> No dispatch is possible on specific types. This fact is
>> language independent.
>
>No dispatch is necessary, but it is certainly possible.
>Tagged objects have a dispatch table, and it can be used
>even in those cases where the compiler knows the dynamic
>type.

Dispatch table is a property of a dispatching subroutine.

>> The fact is, the same method sometimes appears dispatching and sometimes not.
>
>No, that is not the fact. The method is always dispatching, it is simply
>that the dispatch table used is different at different times.

It is a complementary view. Either we say that the type of an object
is mutating or that the type of a formal parameter does (= changing
the dispatch table = changing the subroutine parameter profile). The
effect is same. It is no more strongly typed.

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