You'll probably just want to build your hash as a circular linked list:
my $position_of = (
'A' => {
next_key => 'A#',
prev_key => 'G#',
# other stuff . . .
},
'A#' => {
next_key => 'B',
prev_key => 'A',
# other stuff . . .
},
### in-between stuff
'G#' => {
next_key => 'A',
prev_key => 'G',
# other stuff . . .
},
);
Update: with circular linked lists you usually keep track of head/tail:
my $head = 'A';
my $tail = 'G#';
--Jim
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