From: Robb.Nebbe@di.epfl.ch (Robb Nebbe)
Subject: Re: What good is halting prob?
Date: 1995/04/19
Date: 1995-04-19T00:00:00+00:00 [thread overview]
Message-ID: <1995Apr19.113045@di.epfl.ch> (raw)
In-Reply-To: cppD78xMv.49w@netcom.com
:
: If b was declared as a class member, then you can tell if it is initialized
: by the constructor. In OOP, global data is a no-no, so b would either be
: a class member or a local variable. Where an order of initialization
: dependency exists between two objects, there could be some trouble, but
: static initializers can deal with this (as in the standard library
: iostreams.h). If b is a local it is even easier to detect initialization.
: With reasonable constraints on the language, detecting initialization seems
: feasible to me. What am I missing?
You always have the three cases: it is initialized, it
isn't initialized or you can't tell. By carefully designing the
language (or through careful use of the language) you can eliminate
the case where you can't tell. But then you are not dealing with a
general solution; you have restricted the problem space to a
particular case of interest which is often sufficient.
By the way default constructors really don't count as initialization.
They have a legal value but often it isn't meaningful -- it is just
some neutral value.
Robb Nebbe
next prev parent reply other threads:[~1995-04-19 0:00 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-03-17 0:24 Should internet support software be written in Ada? Bill Brooks
1995-03-17 8:47 ` Anthony Shipman
1995-03-19 22:06 ` David Weller
1995-03-23 15:05 ` Theodore Dennison
1995-03-24 10:26 ` Fred J. McCall
1995-03-27 9:50 ` Robb Nebbe
1995-03-27 19:43 ` State machines and Goto's (was Re: Should internet support software be written in Ada?) Robert I. Eachus
1995-03-27 23:14 ` Arthur Evans Jr
1995-03-29 0:00 ` Dan
1995-04-01 0:00 ` Mike White
1995-04-04 0:00 ` Robert Dewar
1995-04-06 0:00 ` Theodore Dennison
1995-04-06 0:00 ` Norman H. Cohen
1995-04-07 0:00 ` Tucker Taft
1995-04-07 0:00 ` Robert Dewar
1995-04-07 0:00 ` Mike White
[not found] ` <3ma7rt$smt@kaiwan009.kaiwan.com>
[not found] ` <dewar.797514490@gnat>
[not found] ` <3meunj$66u@felix.seas.gwu.edu>
1995-04-20 0:00 ` CS teachers who can't code their way outta a paper bag Richard A. O'Keefe
1995-03-27 14:24 ` Should internet support software be written in Ada? Theodore Dennison
1995-03-28 0:00 ` Robert Dewar
1995-03-28 9:32 ` Fred J. McCall
1995-03-29 0:00 ` Theodore Dennison
1995-03-29 0:00 ` Robert I. Eachus
1995-03-31 0:00 ` Theodore Dennison
1995-04-05 0:00 ` Wes Groleau
1995-04-07 0:00 ` State machines and Goto's (was Re: Should internet support software be written in Ada?) Wes Groleau
1995-04-07 0:00 ` Robert Firth
[not found] ` <D6qyv0.6Jv@nntpa.cb.att.com>
1995-04-19 0:00 ` Fergus Henderson
1995-04-19 0:00 ` Fred J. McCall
1995-04-19 0:00 ` George Haddad
1995-04-20 0:00 ` Mark A Biggar
1995-04-20 0:00 ` State machines and Goto's (was Re: Sho Brian Hanson
1995-04-20 0:00 ` State machines and Goto's (was Re: Should internet support software be written in Ada?) Bill Winn
1995-04-20 0:00 ` Robert Dewar
1995-03-22 23:08 ` Should internet support software be written in Ada? Keith Thompson
[not found] ` <3me1qs$n4a@theopolis.orl.mmc.com>
[not found] ` <3mevmu$8an@felix.seas.gwu.edu>
[not found] ` <3mh75i$8eu@rational.rational.com>
[not found] ` <3mjihr$iqq@felix.seas.gwu.edu>
[not found] ` <3mp20f$80t@kaiwan009.kaiwan.com>
1995-04-20 0:00 ` Academic CS Losers? Phillip Fanous
1995-04-21 0:00 ` Bill Winn
[not found] ` <dewar.798093453@gnat>
1995-04-20 0:00 ` What good is halting prob? Max Hailperin
[not found] ` <dewar.798207931@gnat>
[not found] ` <cppD78ywq.B31@netcom.com>
[not found] ` <3n1fsv$lgd@butch.lmsc.lockheed.com>
1995-04-20 0:00 ` Problems with proofs Robin Rowe
1995-04-20 0:00 ` Garlington KE
[not found] ` <dewar.798240702@gnat>
1995-04-19 0:00 ` Brian Harvey
1995-04-19 0:00 ` Robert Dewar
1995-04-20 0:00 ` Robin Rowe
1995-04-20 0:00 ` Robin Rowe
1995-04-20 0:00 ` Steve Tate
1995-04-20 0:00 ` Apology to Steve Robin Rowe
1995-04-20 0:00 ` Problems with proofs Robert Dewar
1995-04-20 0:00 ` Robert Dewar
1995-04-21 0:00 ` Robin Rowe
1995-04-21 0:00 ` Robert Dewar
1995-04-21 0:00 ` Larry Kahn
[not found] ` <3mrv7h$3mq@larry.rice.edu>
[not found] ` <3msnu4$6am@kaiwan009.kaiwan.com>
[not found] ` <KUBEK.95Apr18213646@insage.gerii.insa-tlse.fr>
[not found] ` <cppD792GC.1uI@netcom.com>
1995-04-20 0:00 ` Teaching OO/C++ Philip Machanick
[not found] ` <cppD75t6F.47M@netcom.com>
[not found] ` <EACHUS.95Apr17172831@spectre.mitre.org>
[not found] ` <cppD77Ex6.E77@netcom.com>
[not found] ` <3mve9b$gaj@news.cais.com>
1995-04-18 0:00 ` What good is halting prob? Jay M Martin
1995-04-19 0:00 ` Steve Tate
1995-04-20 0:00 ` Jay M Martin
1995-04-21 0:00 ` Steve Tate
1995-04-21 0:00 ` Ray Toal
[not found] ` <cppD7880n.32B@netcom.com>
1995-04-19 0:00 ` Randolph Crawford
1995-04-19 0:00 ` Robert Dewar
1995-04-20 0:00 ` Robin Rowe
1995-04-20 0:00 ` Robert Dewar
1995-04-20 0:00 ` Robin Rowe
1995-04-21 0:00 ` Brian Hanson
1995-04-21 0:00 ` sxc
[not found] ` <dewar.798172270@gnat>
[not found] ` <cppD786FM.1u9@netcom.com>
[not found] ` <dewar.798207364@gnat>
[not found] ` <3n0ka7$b57@hermes.unt.edu>
[not found] ` <dewar.798232482@gnat>
1995-04-19 0:00 ` Mark A Biggar
1995-04-19 0:00 ` Robert Dewar
1995-04-19 0:00 ` Steve Tate
[not found] ` <cppD78xMv.49w@netcom.com>
1995-04-19 0:00 ` Robb Nebbe [this message]
1995-04-19 0:00 ` Mark A Biggar
1995-04-19 0:00 ` Richard Ladd Kirkham
1995-04-19 0:00 ` Robert Dewar
1995-04-20 0:00 ` Richard Ladd Kirkham
1995-04-20 0:00 ` Robert Dewar
1995-04-21 0:00 ` Mark A Biggar
1995-04-21 0:00 ` Robert I. Eachus
1995-04-21 0:00 ` Robert Dewar
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