So you want to be able to find the index by searching on the key (and you want this to be fast, i.e. not scanning an array)... this indicates that at some level you can find the array index from within the value of hash by key. But you also want to be able to update all of the indexes without iterating said hash? That seems like a contradiction. I must be misunderstanding something. 
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In reply to Re^3: Re-orderable keyed access structure? by etcshadow
in thread Re-orderable keyed access structure? by BrowserUk

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