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

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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.

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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?
[reply]
[d/l]

      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.
[reply]

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