Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re: Side effect of passing matched values by reference

by choroba (Canon)
on Feb 21, 2013 at 17:22 UTC ( #1019989=note: print w/ replies, xml ) Need Help??


in reply to Side effect of passing matched values by reference

That is not a consequence of passing by reference, in fact. It is a consequence of aliasing. See perlsub for details. This would not happen if you use a different variable than @_:

sub foo { my $x = $_[0]; print "$x\n"; $x =~ /(.)/; print "$x\n\n"; }
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ


Comment on Re: Side effect of passing matched values by reference
Download Code
Replies are listed 'Best First'.
Re^2: Side effect of passing matched values by reference
by puterboy (Scribe) on Feb 21, 2013 at 18:23 UTC
    Of course - that was the solution I used. My point was just that it wasn't obvious (at least to me) that $1 acts like a global variable in that way...

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1019989]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (7)
As of 2015-07-08 04:54 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (94 votes), past polls