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Re: CPAN Module Sys::Virt and virsh console

by daxim (Chaplain)
on Sep 19, 2013 at 15:40 UTC ( #1054870=note: print w/replies, xml ) Need Help??


in reply to CPAN Module Sys::Virt and virsh console

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Re^2: CPAN Module Sys::Virt and virsh console
by eyekona (Acolyte) on Sep 20, 2013 at 07:14 UTC
    Yeah it is, because it's a difficult question, and i want to find at least one that can answer it. There is no tutorial and howto anywhere so i don't think many people are using it and I hope that there is at least one in both forums that uses this and can help! Because i really need help! As you can see - no answer here and no answer there nearly 24 hours after asking... So i had a reason, right?
        Oh ok thanks, didn't knew... Next time i provide the link myself.

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[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.

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