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

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
HyperZonk and Synapse0 have both suggested that the my is being ignored and all that is happenning is that $x is simply global.

It's a good theory, and certainly what I thought when I first looked at it. But it's easy to see that this isn't true: try comparing

sub foo{ my $x if 0; print "FOO: ", $x++, "\n"; } sub bar{ my $x if 0; print "BAR: ", $x--, "\n"; } foo, bar for (1..10);
with
sub foo{ print "FOO: ", $x++, "\n"; } sub bar{ print "BAR: ", $x--, "\n"; } foo, bar for (1..10);

I reckon the real reason is the explanation given by Abigail.

Now I don't think I would ever write my $x if 0 unless I wanted to get the sack for writing obscure code, but how about:

sub STATIC_VARIABLE{ 0 } sub foo{ STATIC_VARIABLE && my $x; print "FOO: ", $x++, "\n"; }
would that be difficult to understand? Would it carry on working in the future?

-- iakobski


In reply to Re: Re: Re: Unusual Closure Behaviour by iakobski
in thread Unusual Closure Behaviour by tachyon

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (7)
    As of 2014-09-16 22:48 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (51 votes), past polls