Geez. This isn't supposed to be obfuscation, but it ended up that way, in the sense that the algorithm is a bit difficult to extract. The swapping is the easy part... those two parallel arrays are not. 
# reorder an array using only swap(ARRAY, X, Y),
# given a new set of indices

my @array = qw( put these in a different order );
my @order = qw( 1 3 5 4 2 0 );
reorder_swap(\@array, \@order);

# expected outcome:
# qw( these a order different in put )

sub reorder_swap {
  my ($a, $o) = @_;
  my @P = my @R = 0 .. $#$o;

  for (0 .. $#$o) {
    next if $P[$$o[$_]] == $_;
    swap($a, $P[$$o[$_]], $_);
    (@P[$R[$_],$$o[$_]], @R[$P[$$o[$_]],$_]) =
    (@P[$$o[$_],$R[$_]], @R[$_,$P[$$o[$_]]]);
  }
}

sub swap {
  my ($a, $x, $y) = @_;
  @$a[$x,$y] = @$a[$y,$x];
}

[download]
For simplicity's sake, here's the for loop with a temporary variable instead: 
  for (0 .. $#$o) {
    my $idx = $$o[$_];
    next if $P[$idx] == $_;
    swap($a, $P[$idx], $_);
    (@P[$R[$_],$idx], @R[$P[$idx],$_]) =
    (@P[$idx,$R[$_]], @R[$_,$P[$idx]]);
  }

[download]
_____________________________________________________
Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to (CLPM) reorder via swap by japhy

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