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Re: Schwartzian transform deformed with impunity

by moritz (Cardinal)
on Apr 22, 2012 at 16:39 UTC ( #966480=note: print w/replies, xml ) Need Help??


in reply to Schwartzian transform deformed with impunity

The reason for the warnings is that the split returns chunks like 9.gb.txt, which are not numeric. Try to just extract the number:

@sorted = map{$_->[0]} sort{$a->[1] <=> $b->[1]} map{ [$_, /(\d+)/g] } + @unsorted;

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[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($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.

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