Re: how to call a sub via variable in library

$self->{&{\&{$testname}}}->($system); #system is hashref
[download]

...

Use of uninitialized value $self in concatenation (.) or string
Can't call method "_idown" on an undefined value
Can't call method "_idown" on an undefined value
[download]

The errors suggest that at some point you are invoking one of your methods without argument, thus $self is never initialized. Carp can be very helpful here for recovering the call stack where the error is actually happening, in the calling routine. You could also manually construct a relevant error using caller:

sub method {
    my $self = shift or die join(", ", caller()), "\n";
...
}
[download]

If I've misdiagnosed the issue (which is plausible given how complex your invocation is), you probably want to learn How can I visualize my complex data structure?.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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Re^2: how to call a sub via variable in library by Anonymous Monk on Nov 17, 2014 at 19:09 UTC
$self is perhaps initialized, but `no strict 'refs'; $self->{ &{$testcase} }` [download] (I mean, the original, obfuscated version) is probably undef... But I'm no going to read this code any futher, frankly.	[reply] [d/l]
Re^3: how to call a sub via variable in library by kennethk (Abbot) on Nov 17, 2014 at 19:28 UTC
That was my original thought, and then I saw `Use of uninitialized value $self in concatenation (.) or string` That's why I think `my $self = shift or confess '$self undef';` is probably the best bet. I should point out that the `$self` that is uninitialized may not be the `$self` in the grotesque expression above. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l] [select]


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