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digitalmars.D - Request: Simple Associative Sets

I find that I encounter situations where I simply need a hash set it is quite
similair to an associative array but I end up always wanting something like

    [Node] visited;

and I simply want to know if it is in the set and remove it optionally which
Associative Arrays already have. I was wondering the thoughts on if this would
be useful? Right now I use

    bool[Node] visited;

and never ever even touch the bools since if it is in the set its all the info
I need...
Jul 31 2008