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Re: my $@ - a proposal

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On Jul 7, 2008, at 8:23 PM, Jan Dubois wrote:
> On Mon, 07 Jul 2008, Graham Barr wrote:
>> Why is die in DESTROY a programming error ?
>>
>> It is perfectly valid and eval{} will catch it today. I see no reason
>> to break that.
>
> No, it does not work like that in Perl right now.  A die() inside a  
> DESTROY
> method will just print to STDERR and append the string to $@:
Eek! I was sure I had used it, but obviously not. Now I will have to go
and hunt for the code, but I fear the code where I was likely to have  
tried
something like this would have been for my previous employer :-(
Graham.
> #!perl
> use strict;
> use warnings;
>
> sub foo::DESTROY { die "trying to throw an exception\n" }
>
> $@ = "Some old rubbish\n";
> do { my $foo = bless [] => "foo"; 1 };
> print "\$\@ is $@\n";
> __END__
>
> You'll see that the code does not throw an exception.  It also doesn't
> assign to $@, it just appends a string:
>
> 	(in cleanup) trying to throw an exception
> $@ is Some old rubbish
> 	(in cleanup) trying to throw an exception
>
> If you assign an object to $@ before you trigger the DESTROY, then the
> object will be thrown away and just the "\t(in cleanup)" message will
> be assigned.
>
> Cheers,
> -Jan
>
>
>
>

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• my $@ - a proposal by Yuval Kogman
• RE: my $@ - a proposal by Jan Dubois
• Re: my $@ - a proposal by David Nicol
• Re: my $@ - a proposal by Graham Barr
• Re: my $@ - a proposal by David Nicol
• Re: my $@ - a proposal by Mark Mielke
• RE: my $@ - a proposal by Jan Dubois
• Re: my $@ - a proposal by Graham Barr
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