Iterate/sort associative array by value?

[Robert M. Münch via Digitalmars-d-learn]

I have an AA int[ulong] and would like to traverse the AA from biggest 
to smallest by value. Is there an elegant way to do this?

The only way I can imagine is to create an "reverse" AA of the form 
ulong[int] and than sort by keys. Traverse this AA and use the value as 
the lookup key in the orginial array. But this feels all a bit wired...

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Robert M. Münch
http://www.saphirion.com
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