From: Robert Dewar <dewar@gnat.com>
Subject: Re: Ada95 Strengths/Weaknesses.
Date: 1999/09/28
Date: 1999-09-28T00:00:00+00:00 [thread overview]
Message-ID: <7sp914$ago$1@nnrp1.deja.com> (raw)
In-Reply-To: 7smp30$9aa1@news.cis.okstate.edu
In article <7smp30$9aa1@news.cis.okstate.edu>,
dstarner98@aasaa.ofe.org wrote:
> * Type safety makes it harder for some stuff to get done -
> i.e. it's impossible to make a type look exactly like a number
> in Ada,
That is just a false statement. Unchecked conversion allows you
to do anything in this area you can do in C++. Yes, some uses
of unchecked conversion in Ada are implementation dependent,
but no more so or less so than the corresponding casts in C++.
> but trivial in C++.
Two comments: one, yes the syntax is trivial in C++, and this
is something I would list as a disadvantage of C++, not an
advantage. It is far too easy to break the type model in C++.
> * C++ includes several somewhat experimental features
> (template specilization,
> multiple inheritance) that Ada designers considered too
> experimental or
> specialized to add.
Well I think you need to give examples here. Many people would
regard the multiple inheritance in C++ to be a disadvantage for
three reasons:
1. The OO model is much cleaner if only single inheritance is
used, so the semantics is much simpler. This is why many OO
languages deliberately avoid supporting MI.
2. The MI model in C++ is one of several. Having a specific
model built into the language is unhelpful if your problem is
best handled by some different model.
3. In most C++ compilers, you pay a price in distributed
overhead for this feature, even if you do not use multiple
inheritance.
> Disadvantages vs. C & C++
> * Large base of installed libraries. If you can find a Ada
library that does
> what you need to do (not unlikely, but not as likely as for C
or C++ - and it's
> probably a wrapper around a C library), it probably won't come
precompiled and
> set up for your system
It seems far preferable to find libraries in source form, for
many reasons!
Robert Dewar
Ada Core Technologies
Sent via Deja.com http://www.deja.com/
Before you buy.
next prev parent reply other threads:[~1999-09-28 0:00 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-09-27 0:00 Ada95 Strengths/Weaknesses the middleman
1999-09-27 0:00 ` David Starner
1999-09-28 0:00 ` the middleman
1999-09-28 0:00 ` Robert Dewar
1999-09-28 0:00 ` David Starner
1999-09-28 0:00 ` Gautier
1999-09-28 0:00 ` Ed Falis
1999-09-28 0:00 ` David Starner
1999-09-29 0:00 ` Robert Dewar
1999-09-28 0:00 ` David Starner
1999-09-29 0:00 ` Robert Dewar
1999-09-28 0:00 ` p.obry
1999-09-28 0:00 ` David Starner
1999-09-28 0:00 ` Richard D Riehle
1999-09-28 0:00 ` Robert Dewar
1999-09-28 0:00 ` Robert Dewar
1999-09-28 0:00 ` David Starner
1999-09-29 0:00 ` Robert Dewar
1999-09-30 0:00 ` Pragma (was Re: Ada95 Strengths/Weaknesses.) Preben Randhol
1999-09-30 0:00 ` Preben Randhol
1999-09-28 0:00 ` Ada95 Strengths/Weaknesses Ted Dennison
1999-09-28 0:00 ` Simon Wright
1999-09-28 0:00 ` Code size of Ada ? was " Alfred Hilscher
1999-09-28 0:00 ` Gautier
1999-09-28 0:00 ` David Botton
1999-09-29 0:00 ` Robert Dewar
1999-09-29 0:00 ` Alfred Hilscher
1999-09-29 0:00 ` Robert Dewar
1999-09-30 0:00 ` Alfred Hilscher
1999-09-30 0:00 ` Robert Dewar
1999-09-30 0:00 ` Gautier
1999-09-29 0:00 ` Larry Kilgallen
1999-09-29 0:00 ` Robert Dewar
1999-09-29 0:00 ` Alfred Hilscher
1999-09-29 0:00 ` Gautier
1999-09-29 0:00 ` Ed Falis
1999-09-29 0:00 ` tmoran
1999-09-29 0:00 ` Gautier
1999-09-30 0:00 ` Robert Dewar
1999-09-29 0:00 ` Robert Dewar
1999-09-30 0:00 ` Alfred Hilscher
1999-09-30 0:00 ` Gautier
1999-09-30 0:00 ` Robert Dewar
1999-09-30 0:00 ` Robert Dewar
1999-09-30 0:00 ` Robert Dewar
1999-09-30 0:00 ` Robert Dewar
1999-09-30 0:00 ` Ehud Lamm
1999-09-30 0:00 ` Robert Dewar
[not found] ` <7t2e1l$lqt2@ftp.kvaerner.com>
[not found] ` <37F91D6E.58685CFE@mitre.org>
[not found] ` <7tf7uo$h2b$1@nnrp1.deja.com>
[not found] ` <37FBA978.A86762F1@mitre.org>
1999-10-18 0:00 ` Robert Dewar
1999-10-19 0:00 ` Code size of Ada ? Robert I. Eachus
[not found] ` <7tf7uo <37FBA978.A86762F1@mitre.org>
[not found] ` <5OkO3.2$1e.659@typhoon.nyu.edu>
1999-10-19 0:00 ` Code size of Ada ? was Re: Ada95 Strengths/Weaknesses Robert I. Eachus
1999-09-30 0:00 ` tmoran
1999-09-29 0:00 ` Ted Dennison
1999-09-29 0:00 ` Robert Dewar
1999-09-28 0:00 ` GNAT listing file default names (was: Ada95 Strengths/Weaknesses) Larry Kilgallen
1999-09-28 0:00 ` Gautier
1999-09-29 0:00 ` Robert Dewar
1999-09-29 0:00 ` Robert Dewar
1999-09-29 0:00 ` Larry Kilgallen
1999-09-29 0:00 ` Robert Dewar
1999-09-29 0:00 ` Larry Kilgallen
1999-09-30 0:00 ` Robert Dewar
1999-09-28 0:00 ` Robert Dewar [this message]
1999-09-28 0:00 ` Ada95 Strengths/Weaknesses David Starner
1999-09-29 0:00 ` Robert A Duff
1999-09-28 0:00 ` David Starner
1999-09-28 0:00 ` Robert Dewar
1999-09-28 0:00 ` Ray Blaak
1999-09-27 0:00 ` Marin David Condic
1999-09-27 0:00 ` Hyman Rosen
1999-09-28 0:00 ` Robert Dewar
1999-09-28 0:00 ` Preben Randhol
1999-09-28 0:00 ` bill
1999-09-27 0:00 ` Aidan Skinner
1999-09-28 0:00 ` Preben Randhol
1999-09-28 0:00 ` Larry Kilgallen
1999-09-28 0:00 ` Steve Doiel
1999-09-28 0:00 ` Ed Falis
1999-09-28 0:00 ` Hyman Rosen
1999-09-28 0:00 ` Ed Falis
1999-09-28 0:00 ` Preben Randhol
1999-09-27 0:00 ` Steve Doiel
1999-09-27 0:00 ` J. David Bryan
1999-09-28 0:00 ` Geoff Bull
1999-09-29 0:00 ` the middleman
1999-09-29 0:00 ` Robert A Duff
1999-09-28 0:00 ` Geoff Bull
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