Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

indapa

by indapa (Monk)
on Dec 09, 2000 at 12:40 UTC ( #45873=user: print w/replies, xml ) Need Help??

perl monks site FAQ (Ovid) Re: require and use

Second rate programmers and my confession

Re: At what rate are YOU progressing?

Strong Typing

Pass by reference vs. globals

<A HREF = http://www.perlmonks.org/index.pl?node_id=72263&lastnode_id=72247"> Re: Scalars, Lists, and Arrays

Suffering from Buffering?

How Regexes Work

Resorting to Sorting

Working with other processes and programs

Map: The Basics

Parse::RecDescent Tutorial
The man(1) of descent
Parse::RecDescent POD

Log In?
Username:
Password:

What's my password?
Create A New User
Chatterbox?
[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[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

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (14)
As of 2017-07-27 13:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    I came, I saw, I ...
























    Results (413 votes). Check out past polls.