Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Re^3: Dumb, non-question: How to return 'nothing'.

by BrowserUk (Pope)
on Jun 17, 2011 at 20:45 UTC ( #910256=note: print w/replies, xml ) Need Help??


in reply to Re^2: Dumb, non-question: How to return 'nothing'.
in thread Dumb, non-question: How to return 'nothing'.

I think I've settled on requiring that the iterator be called in a list context. Eg.:

sub i{ my $n = shift; return sub{ $n ? $n-- : () } };; $i = i( 5 ); print $_ while ( $_ ) = $i->();; 5 4 3 2 1

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

Replies are listed 'Best First'.
Re^4: Dumb, non-question: How to return 'nothing'.
by SuicideJunkie (Vicar) on Jun 17, 2011 at 21:05 UTC
    Would be worthwhile to add carp "Iterator not called in list context" unless wantarray; so it can't be used improperly?

      Excellent notion. Thanks.


      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://910256]
help
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (6)
As of 2017-04-24 18:12 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    I'm a fool:











    Results (443 votes). Check out past polls.