X-Authentication-Warning:	delorie.com: mailnull set sender to djgpp-bounces using -f
From:	"Jesper Lund" <jl1204 AT worldonline DOT dk>
Newsgroups:	comp.os.msdos.djgpp
References:	<3C66CA98 DOT 70901 AT vif DOT com>
Subject:	Re: c++ exceptions
Lines:	38
X-Priority:	3
X-MSMail-Priority:	Normal
X-Newsreader:	Microsoft Outlook Express 5.50.4807.1700
X-MimeOLE:	Produced By Microsoft MimeOLE V5.50.4807.1700
Message-ID:	<xjB98.4723$5L3.298693@news010.worldonline.dk>
Date:	Sun, 10 Feb 2002 22:07:10 +0100
NNTP-Posting-Host:	213.237.2.159
X-Complaints-To:	news-abuse AT wol DOT dk
X-Trace:	news010.worldonline.dk 1013375325 213.237.2.159 (Sun, 10 Feb 2002 22:08:45 MET)
NNTP-Posting-Date:	Sun, 10 Feb 2002 22:08:45 MET
Organization:	Customer of Tiscali A/S (World Online)
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

"Sahab Yazdani" <sahaby AT vif DOT com> wrote:

> does GCC3.0.x support C++ exceptions properly??  or is it that I can't
> code them properly??
>
> I have this code (stripped down for newsgroups):
> namespace Std {
>   class Exception {
>   public:
>    char *message;
>    Exception( char *message = NULL ); // this code works file!
>   };

You have to define the constructor somewhere, so this piece of code does not
link properly. Your constructor should allocate memory for the char* message
class member, and copy the string in the argument of the constructor (you
need to give that argument a different name; right now it coincides with the
class member).

[snip]

>
> NOW by my logic, this primitive program should output:
> File not found
>
> but it outputs nothing, yet if I change the line "printf( e.message);"
> to "printf( "Exception Caught: %s\n", e.message );", it outputs:
> Exception Caught:
> so it is catching the exceptions properly, but the values in the
> exception class is getting messed up.
>

The value of the e.message char pointer is 0, so printf outputs an empty
string. This is to be expected since you never assign anything to the
variable.

- Raw text -