Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

Re^3: Pass array, then clear

by Crackers2 (Parson)
on Jan 16, 2018 at 18:27 UTC ( #1207364=note: print w/replies, xml ) Need Help??


in reply to Re^2: Pass array, then clear
in thread Pass array, then clear

I did not suspect that the subroutine made a copy of the memory address

It doesn't. You do, with the my($data) = @_; snippet. If you directly manipulate the argument, it works as you expect:

sub clear_it { $_[0] = []; }

Because you're then working on the original reference, not on the copy you made.

Replies are listed 'Best First'.
Re^4: Pass array, then clear
by Anonymous Monk on Jan 16, 2018 at 18:37 UTC
    Thank you, I did not realize that!
Re^4: Pass array, then clear
by Anonymous Monk on Jan 16, 2018 at 20:36 UTC
    This reply really brings it home for me. Light coming on strongly (or is it just the flames of the reference burnage?). I now see the error of my ways.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1207364]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2020-10-30 19:49 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My favourite web site is:












    Results (284 votes). Check out past polls.

    Notices?