From: mcsun!ub4b!cfmu!news@uunet.uu.net (Stef Van Vlierberghe)
Subject: Survey : use of limited private types
Date: 22 Apr 92 15:38:11 GMT [thread overview]
Message-ID: <1992Apr22.153811.11769@cfmu.eurocontrol.be> (raw)
A few weeks ago on the ISO-WG9 meeting on the Ada9X project,
I tried to reraise the issue of type abstraction and
user-defined assignment. The "answer" seemed to be "use
limited types, export procedure ASSIGN, and live with all
the known limitations of limited types", since for
non-published reasons "user-defined assignment was
considered too complex an issue". A reference to the C++
support for the paradigm invoked only adverse response.
Therefore a little survey. Everyone that replies by email
will receive a report that summarizes all replies, so you
can directly reply to stef@cfmu.eurocontrol.be or post of
follow-up article.
I have major difficulty selling the answer quoted above in
our environment. Most programmers had a little experience
with limited types, enough to scare them off, and are very
reluctant to try once more. Has anyone experience with
abstract data types that need control over equality or
assignment? Were limited types used in this case (as the
"answer" above suggests)? Or did you simply rely or the
predefined assignment not being used?
Do you use components that do not support generic formal
limited types (such as most Booch components), or do you use
components that do ? Were these acquired externally
(reference if possible) or developed in-house (sample or
spec if possible) ?
Do you know of any published information about the
INFEASIBILITY of user-defined assignment?
--
Stef VAN VLIERBERGHE Eurocontrol - Central Flow Management Unit
stef@cfmu.eurocontrol.be Avenue des Arts 19H
Tel: +32 2 729 33 42 B-1040 BRUSSELS
Fax: +32 2 729 32 16 Belgium
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