Re: Argument stringification in __WARN__ and __DIE_

Except the following happens

Indeed, I've lamented this in Any last words?. The problem is due to the fact that the __DIE__ signal handler (and all signal handlers for that matter) only expect one argument, so if you ever pass more than one arg to die perl automagically concatenates the arguments. There is one way around it, but it is rather hackish - set $@ to an object and that will be passed to your $SIG{__DIE__} handler (consult the die docs for more info on this behaviour) e.g

use overload
  q[""]    => sub { "@{$_[0]}" },
  fallback => 0;

$SIG{__DIE__} = sub { print "dang - ", @{$_[0]}, $/ };
$@ = bless [qw/that didn't work/];
die;

__output__

dang - thatdidn'twork
that didn't work
[download]

Terrifically hackish, but it works ;)
HTH

_________ broquaint

Comment on Re: Argument stringification in __WARN__ and __DIE__ Download Code

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Re: Re: Argument stringification in __WARN__ and __DIE__ by Rhandom (Curate) on May 14, 2003 at 22:06 UTC
Thanks for the reply. That could almost be workable. Also I could also do: `die ["Some error happened", {other => 'args'}];` [download] Downsides are that it looks ugly if you don't have an __DIE__ handler - and it still doesn't work for __WARN__. my @a=qw(random brilliant braindead); print $a[rand(@a)];	[reply] [d/l]
Re: Re: Re: Argument stringification in __WARN__ and __DIE__ by broquaint (Abbot) on May 15, 2003 at 10:01 UTC
Downsides are that it looks ugly if you don't have an __DIE__ handler If you overload the stringification operator for your object then you should be able to get the desired behaviour for `die`. Another option is that you could overload `die` and `warn` e.g `BEGIN { CORE::GLOBAL::die = sub { CORE::die("$_[0]->{type}: $_[0]->{msg}\n"); }; CORE::GLOBAL::warn = sub { CORE::warn("$_[0]->{type}: $_[0]->{msg}\n"); }; } warn { type => "warntest", msg => "missing point" }; die { type => "dietest", msg => "and I'm done" }; __output__ warntest: missing point dietest: and I'm done` [download] Extraordinarily hackish, but at least there's an option :) HTH `_________ broquaint`	[reply] [d/l]