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RE: Re: Scoped Variables in a Recursive Function.

by Adam (Vicar)
on Sep 28, 2000 at 19:46 UTC ( #34412=note: print w/ replies, xml ) Need Help??


in reply to Re: Scoped Variables in a Recursive Function.
in thread Scoped Variables in a Recursive Function.

That will work, but as tilly pointed out, the problem is with the MergeSort code being named. This aught to work with the fewest changes to your code:

sub Merge(@) { my @array = @_; local $MergeSort = sub { ### Anonymous code ref. ### my $first = shift; my $last = shift; if ($last>$first) { my $mid = int(($last+$first)/2); $MergeSort->($first, $mid); $MergeSort->($mid+1, $last); my @b; @b = ( @array[$first..$mid], @array[reverse($mid+1..$last)] ); my ($i, $j, $k) = (0, $last-$first, $first); for (; $k<=$last; $k++) { $array[$k] = ($b[$i]<$b[$j]) ? $b[$i++] : $b[$j--]; } } } $MergeSort->(0, $#array); return @array; }


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RE: RE: Re: Scoped Variables in a Recursive Function.
by japhy (Canon) on Sep 28, 2000 at 21:12 UTC
    That ought to work, but it's silly, since it creates a code reference EVERY TIME you run Merge(). There's no reason to use a code reference. Define Merge() and MergeSort() in the same block, and have @array be shared between them.

    $_="goto+F.print+chop;\n=yhpaj";F1:eval
      Yeah, I was thinking about that... I think you are right.

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