There different shades of pointless in this discussion. :)
you don't have to keep all $arefs after construction.
DB<112> for $aref ( [1,2,3],[4,5,6],[7,8,9] ) {
$lookup{$aref} = $aref;
$hash{$aref} = [ reverse @$aref ];
}
=> ""
DB<113> \%hash
=> {
"ARRAY(0xa547e40)" => [9, 8, 7],
"ARRAY(0xa5c2e68)" => [6, 5, 4],
"ARRAY(0xa5c3188)" => [3, 2, 1],
}
DB<114> \%lookup
=> {
"ARRAY(0xa547e40)" => [7, 8, 9],
"ARRAY(0xa5c2e68)" => [4, 5, 6],
"ARRAY(0xa5c3188)" => [1, 2, 3],
}
DB<115> print "@{$lookup{$_}}\n" for keys %hash
7 8 9
4 5 6
1 2 3
Hiding all of this behind a tied hash should be feasible, (depending on implementation details of Tie::Hash , IAW when, where and how "stringization" happens )
Anyway I didn't try to find such implementations on CPAN.
One use case could be to implement sets of complex data structures including set operations
Cheers Rolf
( addicted to the Perl Programming Language)
updates
corrected link to Tie::Hash
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