Eh... I added a packed ordinal number to the value of each hash entry. Doesn't have anything to do with keys. And yes, you will have a runtime hit, but only if you need to sort (when you need the ordinal number) and/or obtain the (real) value of the hash entry.

Again, my solution optimizes for memory usage. Not CPU. YMMV.

With regards to Tie::IxHash: that's a fine module, but may be doing (a lot) more than you want. And don't forget the inherit CPU hit for using a tied hash. Finally, TIMTOWTDI. ;-)

Liz

In reply to Re: Re: Re: Re: hash 2 array ? by liz
in thread hash 2 array ? by michaelg

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