Re^2: Help requested to find the cause of an "uninitialized value" message


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Re^2: Help requested to find the cause of an "uninitialized value" message

by andyok (Novice)

on Jan 25, 2022 at 14:30 UTC ( [id://11140849]=note: print w/replies, xml )

Need Help??

in reply to Re: Help requested to find the cause of an "uninitialized value" message
in thread Help requested to find the cause of an "uninitialized value" message

Thank you for your thoughts.

Following a few smaller-test-cases, and reading through all the comments provided, I think I now understand the nature of the error-message ...
... and as you suggest, that the result of eval $dumper is null which when evaluated within %{ .... } is therefore attempting to de-reference a null value.

So yes, I can check to see if %info = %{ eval $dumper } results in an empty %info which I can then use as a trigger for a break-point or for some printing of some extra information.
Thank you for your thoughts and time.
Andrew

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Re^3: Help requested to find the cause of an "uninitialized value" message
by Anonymous Monk on Jan 25, 2022 at 18:32 UTC

You might want to check the results of eval $dumper before you try to use them as a hash reference. Something like

my $hash_ref = eval $dumper;
if ( ! defined $hash_ref ) {
    # You got undef. Handle it as appropriate
} elsif ( 'HASH' eq ref $hash_ref ) {
    # You actually got a hash ref. Handle it.
} else {
    # You got something, but not a hash ref.
    # You don't say this has happened to you, but
    # when troubleshooting, paranoia is justified.
}

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