On 2014-03-28 21:56, Andy Bach wrote:
On Fri, Mar 28, 2014 at 3:05 PM, Dr.Ruud <rvtol+use...@isolution.nl
<mailto:rvtol+use...@isolution.nl>> wrote:
if ($@) {
die "$@";
}
Never test $@, only use the value of $@ after a failed eval.
Why not?
Because $@ is a global variable, which can (AKA will) get changed
between the failure and your test.
So the answer is: Why gamble if you don't need to?
my $obj;
eval {
$obj = get_obj();
1; # success
}
or do {
my $eval_error = $@ || "Zombie Error";
warn "WARNING: ", $eval_error;
...;
};
Recent Perls localize $@ more, so the odds of getting into trouble with
code that is testing $@, have become smaller over the years. Which is
good because there is plenty of code around that still does it.
--
Ruud
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