RE: enumeration value ... not handled in switch

[Joerg Faschingbauer <jfasch at aon dot at>]

From: "Schirmer, Hartmut" <SchirmerH@Innovative-Systems.de>
Subject: RE: enumeration value ... not handled in switch
Date: Wed, 26 Sep 2001 18:05:02 +0200

> Hi,
> 
> > This is bug #3780. I'll be cleaning up my patch a bit (although it
> > won't become less dirty by doing so :-) and submit it. (This won't
> > happen before two weeks, though.)
> 
> not really the same problem.
> 
> In my C code (not C++) I have
> 
> enum { A, B, C } x;
> 
> switch (x)
> {
> case A:
> case B:
> case C:
>    break;
> default:
>    // strange
>    abort();
> }
> 
> The default case is for runtime safty. The variable x may be in an
> illegal state (not initialized, corupted, ...)
> 
> If I later add a D to the enum I won't get a warning because of
> the default case. Changing the code to
> 
> switch (x)
> {
> case A:
> case B:
> case C:
>    break;
> default attribute(silent):
>    // strange
>    abort();
> }
> 
> enables the compile time analysis so I don't have to wait for
> a runtime error.

I obviously misunderstood.

Joerg