Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Or you use closures to turn call-backs into iterators. Here I've altered the API a smidge because the original code used chdir() during the loop which is probably an unexpected side-effect. For anyone that is interested - Dominus is writing an excellent book on iterators and it includes a section on transforming recursive calls somewhat thusly. Here's a link to the book's web page (which you must all now go out and buy (when it is published)).

BTW - this doesn't explain continuations at all - I'm just presenting a different perl5-accessible solution to the problem that tye posed.

my $find = find('', ''); while (my $file = $find->()) { print join('/', @$file)."\n"; } sub find { my @todo = shift; my @results; return sub { while (@todo and not @results) { my $subdir = shift @todo; $subdir = "." if ! defined $subdir or $subdir eq ''; $subdir .= "/" if $subdir =~ m{[^/]$}; my @files= ( glob("$subdir.*"), glob("$subdir*") ); for my $file ( @files ) { next if $file =~ /\.\.?$/; if( ! -l $file && -d _ ) { push @todo, \ $file; } push @results, [ $subdir, substr($file,length($subdir) +) ]; } } return shift @results; }; }

In reply to Re: Re: (Perl6) Groking Continuations (iterators) by diotalevi
in thread (Perl6) Groking Continuations by crenz

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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?

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

    How do I use this? | Other CB clients
    Other Users?
    Others drinking their drinks and smoking their pipes about the Monastery: (6)
    As of 2015-11-28 00:20 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (735 votes), past polls