Re: Bi-Directional Hash Lookup

What's wrong with 2 hashes?

Maybe a HoH is what you need?

my %bidir= (
  column1 => {
    a => 'b',
  },
  column2 => {
    b => 'a',
  },
);
[download]

So $a= $bidir{'column2'}->{$b} will give you "the other" value.

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Replies are listed 'Best First'.
Re^2: Bi-Directional Hash Lookup by PerlingTheUK (Hermit) on Oct 11, 2005 at 12:06 UTC
The problem about HoH is that I regularly update the content. In which case both hashes need updating. I do not like the idea of doing that for both especially as I access and manipulate the data at several locations. I think I will pick a Class structure giving me a getA and a getB method. This will at least make sure that data of a HoH is consistent as long as my setColumn method is fine. Cheers, PerlingTheUK	[reply]
Re^3: Bi-Directional Hash Lookup by pajout (Curate) on Oct 11, 2005 at 12:57 UTC
If you tie Skeeve's hash, you will have the chance to do sync when one of them updated...	[reply]