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robin (1821)

robin
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Journal of robin (1821)

Saturday May 25, 2002
09:57 AM

You know you're starting to think in O'Caml when...

[ #5214 ]
You write Perl code like this:

sub gron {
  my ($f, $total, $width) = @_;
  my $veet;
  $veet = sub {
    my ($partial, $subtotal, $n) = @_;
    my $rem = $total - $subtotal;
    if ($n+1 == $width) {
      $f->($rem, @$partial);
    }
    else {
      $veet->([$_, @$partial], $subtotal+$_, $n+1) for 0..$rem;
    }
  };
  $veet->([], 0, 0);
}

gron(sub {print($_ ? $_ : " ") for @_; print "\n"}, 3, 27);

I'm fairly sure that the idea of using a recursive closure in Perl has never crossed my mind before. Notice the disguised conses as well :-)

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