From: bobduff@world.std.com (Robert A Duff)
Subject: Re: Uninitialized variables, Java example
Date: 1996/07/25
Date: 1996-07-25T00:00:00+00:00 [thread overview]
Message-ID: <Dv47x9.150@world.std.com> (raw)
In-Reply-To: 4t7g2q$ee0@goanna.cs.rmit.edu.au
In article <4t7g2q$ee0@goanna.cs.rmit.edu.au>,
Richard A. O'Keefe <ok@goanna.cs.rmit.edu.au> wrote:
>Wrong. If the problem is that the programmer knows that the default:
>case can never be executed and the compiler doesn't, then the programmer
>should TELL the compiler. For example, in the same situation in C, one
>does
>
> int x;
>
> switch (e) {
> case ..: ... x = ..; break;
>
> case ..: ... x = ..; break;
> default: abort();
> }
>
>I actually use a "shouldnt" macro (name stolen with thanks from Interlisp)
>which is like assert(0) but cannot be suppressed by NDEBUG.
>
>Now the compiler knows that path can't be traversed too.
No, it doesn't. It's quite possible to write the above, and have it
blow up at compile time.
>Better still, a human reader knows that the original programmmer *thought*
>about the problem and didn't just accidentally leave out the default:
>And there is no unncessary initialisation anywhere.
Agreed. I would say, "Now the compiler knows that THE PROGRAMMER THINKS
that path can't be traversed too." And another programmer knows that
the first programmer thinks...
- Bob
next prev parent reply other threads:[~1996-07-25 0:00 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-18 0:00 Uninitialized "out" parameters Paul Whittington
1996-07-18 0:00 ` Adam Beneschan
1996-07-18 0:00 ` Robert Dewar
1996-07-19 0:00 ` Samuel Tardieu
1996-07-19 0:00 ` John Herro
1996-07-19 0:00 ` Tucker Taft
1996-07-23 0:00 ` Peter Hermann
1996-07-23 0:00 ` Robert A Duff
1996-07-19 0:00 ` Pascal Obry
1996-07-19 0:00 ` Peter Hermann
1996-07-19 0:00 ` Dale Stanbrough
1996-07-19 0:00 ` Adam Beneschan
1996-07-19 0:00 ` James A. Squire
1996-07-19 0:00 ` Adam Beneschan
1996-07-20 0:00 ` Michael Feldman
1996-07-21 0:00 ` Fergus Henderson
1996-07-21 0:00 ` Michael Feldman
1996-07-21 0:00 ` Robert Dewar
1996-07-22 0:00 ` Fergus Henderson
1996-07-23 0:00 ` Michael Feldman
1996-07-23 0:00 ` Robert Dewar
1996-07-25 0:00 ` Fergus Henderson
1996-07-24 0:00 ` Robert A Duff
1996-07-25 0:00 ` Richard A. O'Keefe
1996-07-24 0:00 ` Fergus Henderson
1996-07-18 0:00 ` Robert Dewar
1996-07-19 0:00 ` Peter Amey
1996-07-20 0:00 ` Fergus Henderson
1996-07-20 0:00 ` Robert Dewar
1996-07-21 0:00 ` Fergus Henderson
1996-07-21 0:00 ` Robert Dewar
1996-07-23 0:00 ` Fergus Henderson
1996-07-23 0:00 ` Robert A Duff
1996-07-24 0:00 ` Fergus Henderson
1996-07-24 0:00 ` Fergus Henderson
1996-07-23 0:00 ` Richard A. O'Keefe
1996-07-23 0:00 ` Robert Dewar
1996-07-24 0:00 ` Fergus Henderson
1996-07-24 0:00 ` Fergus Henderson
1996-07-24 0:00 ` Robert A Duff
1996-07-25 0:00 ` Richard A. O'Keefe
1996-07-25 0:00 ` Robert A Duff
1996-07-23 0:00 ` Robert A Duff
1996-07-24 0:00 ` Richard A. O'Keefe
1996-07-24 0:00 ` Robert A Duff
1996-07-25 0:00 ` Richard A. O'Keefe
1996-07-25 0:00 ` Robert A Duff
1996-07-24 0:00 ` Theodore E. Dennison
1996-07-25 0:00 ` Frank Manning
1996-07-25 0:00 ` Richard A. O'Keefe
1996-07-26 0:00 ` Frank Manning
1996-07-19 0:00 ` Peter Amey
1996-07-19 0:00 ` Michel Gauthier
1996-07-21 0:00 ` Robert A Duff
1996-07-21 0:00 ` Robert A Duff
1996-07-22 0:00 ` Is 'out' different from 'in out' (Was: Uninitialized "out" parameters) Michel Gauthier
1996-07-22 0:00 ` Robert A Duff
1996-07-22 0:00 ` Robert Dewar
1996-07-22 0:00 ` Tucker Taft
1996-07-23 0:00 ` Uninitialized "out" parameters John Herro
1996-07-23 0:00 ` Robert A Duff
1996-07-24 0:00 ` Uninitialized variables, Java example Arra Avakian
1996-07-25 0:00 ` Robert A Duff
1996-07-25 0:00 ` Richard A. O'Keefe
1996-07-25 0:00 ` Robert A Duff [this message]
1996-07-23 0:00 ` Uninitialized "out" parameters Robert Dewar
1996-07-24 0:00 ` Peter Hermann
1996-07-26 0:00 ` Stephen J Bevan
1996-07-26 0:00 ` Robert A Duff
1996-07-23 0:00 ` Is 'out' different from 'in out' (Was: Uninitialized "out" parameters) Michel Gauthier
1996-07-23 0:00 ` Robert Dewar
1996-07-24 0:00 ` Pascal Obry
1996-07-25 0:00 ` Tucker Taft
1996-07-24 0:00 ` Uninitialized variables, Java example Felaco
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