1 Tie::Hash::TwoWay will take a list of one-way associations and
2 transparently create their reverse. For instance, say you have a list
3 of machines, and a list of classes that each machine belongs to.
4 Tie::Hash::TwoWay will take the machines, one by one, with an associated
5 array reference of class names, and build the reverse mapping of classes
6 to machines. All the mappings are stored as hashes. You can access the
7 secondary mappings as if they were hash keys in their own right.
9 WWW: http://search.cpan.org/dist/Tie-Hash-TwoWay/