As far as I can see this is just counting in base $count, in which case I'd probably use a string instead:

  sub genIterator {
    my($len, $count) = @_;
    my $cur = '';
    my $lastdig = $count - 1;
    return sub {
      if (length($cur) < $len) {
        $cur .= '0';
      } else {
        $cur =~ s/([^$lastdig])$lastdig*\z/$1 + 1/e
             or $cur = undef;
      }
      $cur;
    }
  }

[download]

Of course this assumes $count doesn't exceed 10; this approach gets a bit more complex if you need to deal with larger bases.

Hugo

In reply to Re^2: In need of a sequence iterator. by hv
in thread In need of a sequence iterator. by BrowserUk

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!
  • 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, details, 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, summary, 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.