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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Ada95 OOP Questions
Date: 1996/08/06
Message-ID: <EACHUS.96Aug5222531@spectre.mitre.org>#1/1
X-Deja-AN: 172345457
references: <dewar.838959126@schonberg> <4u4ln3$fur@mailsrv2.erno.de>
organization: The Mitre Corp., Bedford, MA.
newsgroups: comp.lang.ada
Date: 1996-08-06T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <4u4ln3$fur@mailsrv2.erno.de> Thomas.Kendelbacher@erno.de (Thomas Kendelbacher) writes:

  > If the introduction of dispatching calls leads people to produce
  > less maintainable code, then this is a *bad* *thing*. (By the way,
  > I don't think it's confusing that the qualifier is the spec where
  > the type is defined; rather, it's a good starting point to narrow
  > down the search for the real code. Using use here leaves you with
  > no clue at all! And this "confusing" point is not peculiar to
  > dispatching calls: it occurs with Ada 83 derived types as
  > well. Not new, although the "search direction" is reversed in that
  > case.)

    Here, here!  Fortunately, it is possible to write large portions
of systems in Ada 95 without using dynamic dispatching.  I am a strong
advocate of the added support for polymorphism in Ada 95, but I also
understand that in real systems you want to restrict the use of 'CLASS
to very well defined parts of the system.  Often these portions are
the high level glue which ties the system together, and some are very
low level routines where redispatching must be done carefully. (Is
'CLASS more or less of a "here be dragons" flag than "with System" or
"with Unchecked_Conversion"?  Don't know, but I'll look for all of
them, as well as "with Starlet", and "with Unchecked_Deallocation.")


--

					Robert I. Eachus

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