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Custom Item Class?

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Hash tables let you store values to 2 integers. Itemtypes are integers. Thus from the item type you can attach and retreive a value, which I would call class.

In the pick up trigger, you check if a player has 2 or more of the same class item by getting all the item classes from the item types and if there is a match then drop or switch items.
 
Agreed, I need such a system for my ORPG, and the tutorials on this site do not explain it enough (the hashtables one)
 
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