Démon
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demon
A demon is a facet of a slot in a frame which causes some action to be taken when the frame is accessed in certain types of ways. For example, an if-needed demon is activated or triggered if the value of the slot is required and a value has not yet been stored in the slot, and it should calculate or otherwise obtain a value for the slot, while a range demon is triggered if a new value is added to the slot, to check that the value added is permissible for this particular slot.
Contributeurs: Imane Meziani, Jean Benoît Morel, Patrick Drouin, wiki
